[Federal Register Volume 69, Number 65 (Monday, April 5, 2004)]
[Proposed Rules]
[Pages 17610-17615]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 04-7290]


 ========================================================================
 Proposed Rules
                                                 Federal Register
 ________________________________________________________________________
 
 This section of the FEDERAL REGISTER contains notices to the public of 
 the proposed issuance of rules and regulations. The purpose of these 
 notices is to give interested persons an opportunity to participate in 
 the rule making prior to the adoption of the final rules.
 
 ========================================================================
 

  Federal Register / Vol. 69, No. 65 / Monday, April 5, 2004 / Proposed 
Rules  

[[Page 17610]]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 2001-NM-243-AD]
RIN 2120-AA64


Airworthiness Directives; Airbus Model A330, A340-200, and A340-
300 Series Airplanes

AGENCY: Federal Aviation Administration, DOT.

ACTION: Notice of proposed rulemaking (NPRM).

-----------------------------------------------------------------------

SUMMARY: This document proposes the supersedure of an existing 
airworthiness directive (AD); applicable to certain Airbus Model A330, 
A340-200, and A340-300 series airplanes; that currently requires 
repetitive inspections to detect discrepancies of the transfer tubes 
and the collar of the ball nut of the trimmable horizontal stabilizer 
actuator (THSA); and corrective action, if necessary. This action would 
expand the applicability of the existing AD; and would require new 
repetitive inspections for discrepancies of the ball screw assembly; 
corrective action if necessary; repetitive greasing of the THSA ball 
nut, and replacement of the THSA if necessary; and a modification or 
replacement (as applicable) of the ball nut assembly. Such modification 
or replacement (as applicable) terminates certain repetitive 
inspections. The actions specified by the proposed AD are intended to 
prevent degraded operation of the THSA due to the entrance of water 
into the ball nut. Degraded operation could lead to reduced 
controllability of the airplane. This action is intended to address the 
identified unsafe condition.

DATES: Comments must be received by May 5, 2004.

ADDRESSES: Submit comments in triplicate to the Federal Aviation 
Administration (FAA), Transport Airplane Directorate, ANM-114, 
Attention: Rules Docket No. 2001-NM-243-AD, 1601 Lind Avenue, SW., 
Renton, Washington 98055-4056. Comments may be inspected at this 
location between 9 a.m. and 3 p.m., Monday through Friday, except 
Federal holidays. Comments may be submitted via fax to (425) 227-1232. 
Comments may also be sent via the Internet using the following address: 
[email protected]. Comments sent via fax or the Internet must 
contain ``Docket No. 2001-NM-243-AD'' in the subject line and need not 
be submitted in triplicate. Comments sent via the Internet as attached 
electronic files must be formatted in Microsoft Word 97 or 2000 or 
ASCII text.
    The service information referenced in the proposed rule may be 
obtained from Airbus, 1 Rond Point Maurice Bellonte, 31707 Blagnac 
Cedex, France. This information may be examined at the FAA, Transport 
Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington.

FOR FURTHER INFORMATION CONTACT: Dan Rodina, Aerospace Engineer, 
International Branch, ANM-116, FAA, Transport Airplane Directorate, 
1601 Lind Avenue, SW., Renton, Washington 98055-4056; telephone (425) 
227-2125; fax (425) 227-1149.

SUPPLEMENTARY INFORMATION: 

Comments Invited

    Interested persons are invited to participate in the making of the 
proposed rule by submitting such written data, views, or arguments as 
they may desire. Communications shall identify the Rules Docket number 
and be submitted in triplicate to the address specified above. All 
communications received on or before the closing date for comments, 
specified above, will be considered before taking action on the 
proposed rule. The proposals contained in this action may be changed in 
light of the comments received.
    Submit comments using the following format:
     Organize comments issue-by-issue. For example, 
discuss a request to change the compliance time and a request to change 
the service bulletin reference as two separate issues.
     For each issue, state what specific change to 
the proposed AD is being requested.
     Include justification (e.g., reasons or data) 
for each request.
    Comments are specifically invited on the overall regulatory, 
economic, environmental, and energy aspects of the proposed rule. All 
comments submitted will be available, both before and after the closing 
date for comments, in the Rules Docket for examination by interested 
persons. A report summarizing each FAA-public contact concerned with 
the substance of this proposal will be filed in the Rules Docket.
    Commenters wishing the FAA to acknowledge receipt of their comments 
submitted in response to this action must submit a self-addressed, 
stamped postcard on which the following statement is made: ``Comments 
to Docket Number 2001-NM-243-AD.'' The postcard will be date stamped 
and returned to the commenter.

Availability of NPRMs

    Any person may obtain a copy of this NPRM by submitting a request 
to the FAA, Transport Airplane Directorate, ANM-114, Attention: Rules 
Docket No. 2001-NM-243-AD, 1601 Lind Avenue, SW., Renton, Washington 
98055-4056.

Discussion

    On May 25, 2001, the FAA issued AD 2001-11-09, amendment 39-12252 
(66 FR 31143, June 11, 2001), applicable to certain Airbus Model A330 
and A340 series airplanes. That AD requires repetitive inspections to 
detect discrepancies of the transfer tubes and the collar of the ball 
nut of the trimmable horizontal stabilizer actuator (THSA); and 
corrective action, if necessary. That action was prompted by several 
reports of disconnection of the transfer tube from the ball nut of the 
THSA. The requirements of that AD are intended to prevent degraded 
operation of the THSA due to the entrance of water into the ball nut. 
Degraded operation could lead to reduced controllability of the 
airplane.

Actions Since Issuance of Previous Rule

    Since the issuance of that AD, the Direction G[eacute]n[eacute]rale 
de l'Aviation Civile (DGAC), which is the airworthiness authority for 
France, has advised us of additional incidents in which transfer tubes 
disconnected from the ball nut of the THSA. In response to these 
initial incidents, Airbus has revised the A330/A340 Airplane 
Maintenance Manual (AMM) to enhance existing maintenance instructions 
for repetitive greasing of the

[[Page 17611]]

THSA, and has developed procedures for new repetitive inspections for 
discrepancies of the ball screw assembly.
    Also, the preamble to AD 2001-11-09 explains that we considered the 
requirements of that AD ``interim action'' and were considering further 
rulemaking. We now have determined that further rulemaking is indeed 
necessary, and this proposed AD follows from that determination.

Explanation of Relevant Service Information

    Airbus has issued the following Service Bulletins (SBs):
     A330-27-3088 (for Model A330 series airplanes) 
and A340-27-4093 (for Model A340-200 and -300 series airplanes), both 
Revision 04, both including Appendix 01, and both dated September 5, 
2002. These SBs describe procedures for repetitive detailed visual 
inspections of the transfer tubes and collar on the THSA ball nut to 
detect discrepancies, including ball migration, distortion, or evidence 
of disconnection of the THSA ball nut. If any discrepancy is found, the 
SBs specify to replace the THSA with a new or serviceable part. (These 
inspections are similar to those specified in Airbus All Operators 
Telexes (AOT) A330-27A3088 and A340-27A4093, both dated April 5, 2001, 
which the existing AD refers to as the appropriate source of service 
information for accomplishment of the actions required by that AD.)
     A330-27-3102, Revision 03, including Appendix 01 
(for Model A330 series airplanes); and A340-27-4107, Revision 04, 
including Appendix 01 (for Model A340-200 and -300 series airplanes); 
both dated June 20, 2003. These SBs describe procedures for repetitive 
detailed visual inspections of the ball screw assembly for 
discrepancies, including cracks, metallic debris, dents, corrosion, 
loose nuts, and damaged or missing lock washers and pins. These SBs 
also describe procedures for an inspection of the gap between the 
secondary nut tenons and the transfer plates using a feeler gage to 
ensure free movement.
     A330-27-3085 (for Model A330 series airplanes) 
and A340-27-4089 (for Model A340-313 series airplanes), both Revision 
02, both dated September 5, 2002. These SBs describe procedures for 
modifying the ball nut assembly by installing new steel balls, seals, 
and a strengthened collar and transfer tubes, to minimize ball 
migration. These SBs also describe procedures for an alternative 
procedure to replace the existing ball nut assembly with an improved 
THSA. These SBs refer to TRW Aeronautical Systems SB 47172-27-03 for 
additional instructions for accomplishing the modification.
     A330-27-3093 (for Model A330 series airplanes) 
and A340-27-4099 (for Model A340-200 and -300 series airplanes), both 
Revision 01, both dated September 5, 2002. These SBs describe 
procedures for modifying the ball nut assembly on the THSA, or, for 
certain airplanes, replacing the THSA with an improved THSA. These SBs 
refer to TRW Aeronautical Systems SB 47172-27-10 for additional 
instructions for accomplishing the modification.
    Accomplishment of the actions in A330-27-3085, Revision 02; A330-
27-3093, Revision 01; A340-27-4089, Revision 02; or A340-27-4099, 
Revision 01; as applicable; eliminates the need for the repetitive 
inspections for discrepancies of the transfer tubes and collar on the 
THSA ball nut.
    The DGAC classified these SBs as mandatory and issued French 
airworthiness directives 2002-414(B) R2 and 2002-415(B) R2, both dated 
October 30, 2002, to ensure the continued airworthiness of these 
airplanes in France.

Explanation of Previous/Concurrent Service Information

    Airbus also has issued SBs A330-27-3052 and A340-27-4059, both 
Revision 03, both dated December 5, 2001. (Airbus SB A330-27-3093, 
Revision 01, and Airbus SB A340-27-4099, Revision 01, specify that SBs 
A330-27-3052 and A340-27-4059, respectively, must be accomplished 
previously or concurrently.) Those SBs describe procedures for 
replacing the THSA with a THSA modified per Lucas Aerospace SB 47147-
27-07. The Lucas SB introduces a modified screwjack with ceramic balls 
and spacer balls, modifies the motor shafts and planet gear assembly, 
and installs machined seals on the transfer tubes.
    Airbus SB A330-27-3052, Revision 03, specifies that the actions in 
Airbus SBs A330-27-3007, A330-27-3015, A330-27-3047, A330-27-3050, and 
A330-27-3020 must be accomplished previously or concurrently. The 
current revisions of those SBs and the actions they describe, as well 
as additional sources of service information referenced in those SBs, 
are as follows:

--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                                                           Additional source of service
            Airbus SB                 Revision level                     Date                        Main action                   information
--------------------------------------------------------------------------------------------------------------------------------------------------------
A330-27-3007....................  01...................  September 18, 1996.................  Replace rudder servo       Samm Avionique SB 5300-27-24-
                                                                                               controls with modified     01.
                                                                                               parts.
A330-27-3015....................  Original.............  June 7, 1995.......................  Modify the control valve   Lucas Aerospace SB 47147-27-02.
                                                                                               detent and the jamming
                                                                                               protection device on the
                                                                                               THSA.
A330-27-3047....................  01...................  November 26, 1997..................  Replace hydraulic motors   Lucas Aerospace SB 47147-27-04.
                                                                                               on the THSA with new
                                                                                               parts.
A330-27-3050....................  Original.............  November 15, 1996..................  Replace mechanical input   Lucas Aerospace SB 47147-27-05.
                                                                                               shaft for THSA with
                                                                                               modified part.
A330-55-3020....................  01...................  October 21, 1998...................  Perform a visual           None.
                                                                                               inspection of the THSA
                                                                                               screw jack fitting
                                                                                               assembly for correct
                                                                                               installation of a
                                                                                               washer; and correctly
                                                                                               install washer as
                                                                                               applicable.
--------------------------------------------------------------------------------------------------------------------------------------------------------

    Airbus SB A340-27-4059, Revision 03, specifies that Airbus SBs 
A340-27-4007, A340-27-4025, A340-27-4054, A340-27-4057, and A340-55-
4021, must be accomplished previously or concurrently. The current 
revisions of those SBs and the actions they describe, as well as 
secondary sources of service information referenced in those SBs, are 
as follows:

--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                                                           Additional source of service
            Airbus SB                 Revision level                     Date                        Main action                   information
--------------------------------------------------------------------------------------------------------------------------------------------------------
A340-27-4007....................  Original.............  April 7, 1994......................  Replace hydraulic motors   Lucas Aerospace SB 47147-27-01.
                                                                                               on the THSA with new
                                                                                               parts.

[[Page 17612]]

 
A340-27-4025....................  Original.............  June 7, 1995.......................  Modify the control valve   Lucas Aerospace SB 47147-27-02.
                                                                                               detent and the jamming
                                                                                               protection device on the
                                                                                               THSA.
A340-27-4054....................  01...................  November 26, 1997..................  Replace hydraulic motors   Lucas Aerospace SB 47147-27-04.
                                                                                               on the THSA with new
                                                                                               parts.
A340-27-4057....................  Original.............  November 15, 1996..................  Replace mechanical input   Lucas Aerospace SB 47147-27-05.
                                                                                               shaft for THSA with
                                                                                               modified part.
A340-55-4021....................  01...................  October 21, 1998...................  Perform a visual           None.
                                                                                               inspection of the THSA
                                                                                               screw jack fitting
                                                                                               assembly for correct
                                                                                               installation of a
                                                                                               washer; and correctly
                                                                                               install washer as
                                                                                               applicable.
--------------------------------------------------------------------------------------------------------------------------------------------------------

FAA's Conclusions

    These airplane models are manufactured in France and are type 
certificated for operation in the United States under the provisions of 
section 21.29 of the Federal Aviation Regulations (14 CFR 21.29) and 
the applicable bilateral airworthiness agreement. Pursuant to this 
bilateral airworthiness agreement, the DGAC has kept the FAA informed 
of the situation described above. The FAA has examined the findings of 
the DGAC, reviewed all available information, and determined that AD 
action is necessary for products of this type design that are 
certificated for operation in the United States.

Explanation of Requirements of Proposed Rule

    Since an unsafe condition has been identified that is likely to 
exist or develop on other airplanes of the same type design registered 
in the United States, the proposed AD would supersede AD 2001-11-09 to 
continue to require repetitive inspections to detect discrepancies of 
the transfer tubes and the collar of the ball nut of the THSA, and 
corrective action if necessary. The proposed AD also would require the 
actions specified in the SBs described previously, except as discussed 
below. In addition, the proposed AD would require repetitive greasing 
of the ball nut of all THSAs per a method approved by the FAA or the 
DGAC. (Airbus A330 AMM, Chapter 12-22-27, dated July 1, 2001; or Airbus 
A340 AMM, Chapter 12-22-27, dated April 1, 2001; as applicable; is one 
acceptable method of compliance with this action.) If, during any 
accomplishment of the greasing procedure, the new grease is expelled 
from the transfer tube (instead of through the drain hole), the 
proposed AD would require replacement of the THSA with a new or 
serviceable THSA, per Airbus Service Bulletin A330-27-3102, Revision 03 
(for Model A330 series airplanes); or A340-27-4107, Revision 04; both 
dated June 20, 2003; as applicable.

Differences Among Proposed AD, French Airworthiness Directive, and 
Service Bulletins

    Although the Accomplishment Instructions of Airbus SBs A330-27-
3088, Revision 04; A340-27-4093, Revision 04; A330-27-3102, Revision 
03; and A340-27-4107, Revision 04; describe procedures for completing a 
reporting sheet with inspection results, this proposed AD would not 
require those actions.
    Although Airbus SBs A330-27-3102, Revision 03, and A340-27-4107, 
Revision 04, specify that operators may contact the manufacturer for 
disposition of certain repair conditions, this proposal would require 
operators to repair the THSA per a method approved by the FAA, or the 
DGAC (or its delegated agent).
    For the modification of the ball nut of each THSA, the French 
airworthiness directive specifies a compliance time of December 31, 
2003, or July 31, 2004, depending on the part number of the THSA. 
Paragraph (f) of the proposed AD specifies a compliance time of 24 
months after the effective date of the AD for this action. In 
developing an appropriate compliance time for this AD, we considered 
the DGAC's recommendation, as well as the manufacturer's 
recommendation, and the degree of urgency associated with the subject 
unsafe condition. In light of all of these factors, we find that a 24-
month compliance time represents an appropriate interval of time for 
affected airplanes to continue to operate without compromising safety.
    Paragraph (d) of the proposed AD specifies that, if the new grease 
applied during the greasing procedure is expelled from the transfer 
tube (instead of through the drain hole), the proposed AD would require 
replacement of the THSA with a new or serviceable THSA. For this 
condition, the French airworthiness directive specifies replacement of 
the THSA, or contacting Airbus, depending on the part number of the 
THSA. We find that replacement of the THSA with a new or serviceable 
THSA will be an acceptable corrective action for this condition. As 
provided by 14 CFR part 39 (67 FR 47997, July 22, 2002), operators may 
request approval of an alternative method of compliance with this 
proposed requirement, if necessary, by submitting a request to the 
office specified in paragraph (j) of this AD.

Explanation of Changes Made To Existing Requirements

    We have changed all references to a ``detailed visual inspection'' 
in the existing AD to ``detailed inspection'' in this action.
    Also, for clarification, we have also revised the references to 
``Model A340 series airplanes'' in the existing AD to ``Model A340-200 
and -300 series airplanes'' in this action.

Cost Impact

    There are approximately 9 Model A330 series airplanes of U.S. 
registry that would be affected by this proposed AD. Currently, there 
are no affected Model A340-200 or -300 series airplanes on the U.S. 
Register. However, if an affected Model A340-200 or -300 series 
airplane is imported and placed on the U.S. Register in the future, the 
following costs would also apply to those airplanes.
    The inspections (per All Operators Telex (AOT) A330-27A3088 or 
A340-27A4093, as applicable) that are currently required by AD 2001-11-
09 take approximately 1 work hour per airplane, per inspection cycle, 
at an average labor rate of $65 per work hour. Based on these figures, 
the cost impact of the currently required actions on U.S. operators is 
estimated to be $585, or $65 per airplane, per inspection cycle.
    The new inspections (per Airbus SBs A330-27-3088 or A340-27-4093, 
as applicable) that are proposed in this AD action would take 
approximately 1 work hour per airplane, per inspection cycle, at an 
average labor rate of $65 per work hour. Based on these figures, the 
cost impact of this proposed requirement on U.S. operators is estimated 
to be $585, or $65 per airplane, per inspection cycle.

[[Page 17613]]

    The new greasing action that is proposed in this AD action would 
take approximately 1 work hour per airplane, per maintenance cycle, at 
an average labor rate of $65 per work hour. Based on these figures, the 
cost impact of this proposed requirement on U.S. operators is estimated 
to be $585, or $65 per airplane, per maintenance cycle.
    In addition to the actions stated above, certain airplanes may be 
subject to additional actions. The following table contains the cost 
impact estimate for each airplane affected by the SBs listed below, at 
an average labor rate of $65 per work hour:

----------------------------------------------------------------------------------------------------------------
                                                 Estimated
     For airplanes listed in Airbus SB--      number of work        Estimated parts cost         Estimated cost
                                                   hours                                          per airplane
----------------------------------------------------------------------------------------------------------------
A330-27-3085 or A340-27-4089, both Revision               12  No charge.......................              $780
 02.
A330-27-3093 or A340-27-4099, both Revision                6  No charge.......................               390
 01.
A330-27-3052, Revision 03...................               6  No charge.......................               390
A330-27-3007, Revision 01...................               1  No charge.......................                65
A330-27-3015................................               2  No charge.......................               130
A330-27-3047, Revision 01...................               2  No charge.......................               130
A330-27-3050................................               2  No charge.......................               130
A330-55-3020, Revision 01...................   2 (inspection  None............................               130
                                                       only)
A340-27-4059, Revision 03...................               6  No charge.......................               390
A340-27-4007................................               2  No charge.......................               130
A340-27-4025................................               2  No charge.......................               130
A340-27-4054, Revision 01...................               2  No charge.......................               130
A340-27-4057................................               2  No charge.......................               130
A340-55-4021, Revision 01...................   2 (inspection  None............................               130
                                                       only)
----------------------------------------------------------------------------------------------------------------

    The cost impact figures discussed above are based on assumptions 
that no operator has yet accomplished any of the current or proposed 
requirements of this AD action, and that no operator would accomplish 
those actions in the future if this AD were not adopted. The cost 
impact figures discussed in AD rulemaking actions represent only the 
time necessary to perform the specific actions actually required by the 
AD. These figures typically do not include incidental costs, such as 
the time required to gain access and close up, planning time, or time 
necessitated by other administrative actions.

Regulatory Impact

    The regulations proposed herein would not have a substantial direct 
effect on the States, on the relationship between the national 
Government and the States, or on the distribution of power and 
responsibilities among the various levels of government. Therefore, it 
is determined that this proposal would not have federalism implications 
under Executive Order 13132.
    For the reasons discussed above, I certify that this proposed 
regulation (1) is not a ``significant regulatory action'' under 
Executive Order 12866; (2) is not a ``significant rule'' under the DOT 
Regulatory Policies and Procedures (44 FR 11034, February 26, 1979); 
and (3) if promulgated, will not have a significant economic impact, 
positive or negative, on a substantial number of small entities under 
the criteria of the Regulatory Flexibility Act. A copy of the draft 
regulatory evaluation prepared for this action is contained in the 
Rules Docket. A copy of it may be obtained by contacting the Rules 
Docket at the location provided under the caption ADDRESSES.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Safety.

The Proposed Amendment

    Accordingly, pursuant to the authority delegated to me by the 
Administrator, the Federal Aviation Administration proposes to amend 
part 39 of the Federal Aviation Regulations (14 CFR part 39) as 
follows:

PART 39--AIRWORTHINESS DIRECTIVES

    1. The authority citation for part 39 continues to read as follows:

    Authority: 49 U.S.C. 106(g), 40113, 44701.


Sec.  39.13  [Amended]

    2. Section 39.13 is amended by removing amendment 39-12252 (66 FR 
31143, June 11, 2001), and by adding a new airworthiness directive 
(AD), to read as follows:

Airbus: Docket 2001-NM-243-AD. Supersedes AD 2001-11-09, Amendment 
39-12252.

    Applicability: All Model A330, A340-200, and A340-300 series 
airplanes; certificated in any category.
    Compliance: Required as indicated, unless accomplished 
previously.
    To prevent degraded operation of the trimmable horizontal 
stabilizer actuator (THSA) due to the entrance of water into the 
ball nut, which could result in reduced controllability of the 
airplane, accomplish the following:

Requirements of AD 2001-11-09

Repetitive Inspections

    (a) For Model A330, A340-200, and A340-300 series airplanes 
equipped with a THSA part number (P/N) 47172, and on which Airbus 
Modification 45299 has been performed: Within 150 flight hours from 
June 26, 2001 (the effective date of AD 2001-11-09, amendment 39-
12252), perform a detailed inspection to detect discrepancies in the 
THSA (including distortion of the transfer tubes, disconnection of 
the tubes, and distortion of the collar of the ball nut), in 
accordance with All Operators Telex (AOT) A330-27A3088 (for Model 
A330 series airplanes) or A340-27A4093 (for Model A340 series 
airplanes), both dated April 5, 2001, as applicable. If any 
discrepancy, as defined in paragraph 4-2-2/Rejection Criteria of the 
applicable AOT, is detected, prior to further flight, replace the 
THSA with a serviceable one, per the applicable AOT.

    Note 1: For the purposes of this AD, a detailed inspection is 
defined as: ``An intensive visual examination of a specific 
structural area, system, installation, or assembly to detect damage, 
failure, or irregularity. Available lighting is normally 
supplemented with a direct source of good lighting at intensity 
deemed appropriate by the inspector. Inspection aids such as mirror, 
magnifying lenses, etc., may be used. Surface cleaning and elaborate 
access procedures may be required.''

    (b) At intervals not to exceed 150 flight hours, repeat the 
inspection mandated in paragraph (a) of this AD, until paragraph (c) 
of this AD has been accomplished.

[[Page 17614]]

New Requirements of This AD

Repetitive Detailed Inspections of THSA Ball Nut and Corrective 
Action

    (c) For airplanes equipped with a THSA having P/N 47172 or 
47147-400: At the applicable compliance time specified in paragraph 
(c)(1), (c)(2), or (c)(3) of this AD, perform a detailed inspection 
of the transfer tubes and collar on the THSA ball nut to detect 
discrepancies, including ball migration, distortion, or evidence of 
disconnection of the THSA ball nut; per Airbus Service Bulletin 
A330-27-3088 (for Model A330 series airplanes) or A340-27-4093 (for 
Model A340-200 and -300 series airplanes), both Revision 04, both 
dated September 5, 2002; as applicable. Repeat this inspection at 
intervals not to exceed 150 flight hours until paragraph (f) of this 
AD is accomplished. If any discrepancy is found during any 
inspection per this paragraph, before further flight, repair the 
THSA, per a method approved by the Manager, International Branch, 
ANM-116, Transport Airplane Directorate, FAA; or the Direction 
Generale de l'Aviation Civile (DGAC) (or its delegated agent).
    (1) Except as provided by paragraph (c)(3) of this AD: For 
airplanes inspected before the effective date of this AD per 
paragraph (a) of this AD, do the initial inspection within 150 
flight hours since the most recent inspection per paragraph (a) or 
(b) of this AD. Accomplishment of this inspection terminates the 
repetitive inspections required by paragraph (b) of this AD.
    (2) Except as provided by paragraph (c)(3) of this AD: For 
airplanes not inspected before the effective date of this AD per 
paragraph (a) of this AD, do the initial inspection within 150 
flight hours after the effective date of this AD. Accomplishment of 
this inspection within the compliance time specified in paragraph 
(a) of this AD eliminates the need to accomplish the inspection in 
paragraph (a) of this AD and terminates the repetitive inspections 
required by paragraph (b) of this AD.
    (3) For airplanes on which ``PRIM X PITCH FAULT'' or ``STAB CTL 
FAULT'' message is displayed on the Electronic Centralized Aircraft 
Monitor (ECAM) associated with the ``PITCH TRIM ACTR (1CS)'' 
maintenance message: Do the inspection in paragraph (c) of this AD 
before further flight after the message is displayed on the ECAM.

Repetitive Greasing Procedure

    (d) For airplanes equipped with a THSA having P/N 47172 or 
47147-XXX (where ``XXX'' is any dash number): Within 700 flight 
hours after accomplishment of the last greasing of the ball nut of 
the THSA, grease the ball nut of the THSA per a method approved by 
the Manager, International Branch, ANM-116; or the DGAC (or its 
delegated agent). Chapter 12-22-27, page block 301, of the Airplane 
Maintenance Manual is one approved method. Repeat the greasing 
procedures at intervals not to exceed 700 flight hours. If, during 
any accomplishment of the greasing procedure, the new grease is 
expelled from the transfer tube (instead of through the drain hole): 
Before further flight, replace the THSA with a new or serviceable 
THSA, per Airbus Service Bulletin A330-27-3102, Revision 03 (for 
Model A330 series airplanes); or A340-27-4107, Revision 04; both 
dated June 20, 2003; as applicable.

Repetitive Inspections of the Ball Screw Assembly and Corrective 
Actions

    (e) For airplanes equipped with a THSA having P/N 47172 or 
47147-XXX (where ``XXX'' is any dash number): Within 700 flight 
hours after the effective date of this AD: Perform a detailed 
inspection of the ball screw assembly for discrepancies; including 
cracks, metallic debris, dents, corrosion, loose nuts, and damaged 
or missing lock washers and pins; and an inspection of the gap 
between the secondary nut tenons and the transfer plates using a 
feeler gage to ensure free movement; per Airbus Service Bulletins 
A330-27-3102, Revision 03 (for Model A330 series airplanes); or 
A340-27-4107, Revision 04; both dated June 20, 2003; as applicable.
    (1) Repeat the inspection at intervals not to exceed 700 flight 
hours.
    (2) If any discrepancy is found that is outside the limits 
specified in the applicable service bulletin, before further flight, 
replace the THSA with a new part, per the applicable service 
bulletin.

    Note 2: There is no terminating action at this time for the 
repetitive actions required by paragraphs (d) and (e) of this AD.

Modification

    (f) Within 24 months after the effective date of this AD, modify 
the ball nut of each THSA by doing paragraph (f)(1) or (f)(2) of 
this AD, as applicable. Accomplishment of paragraph (f)(1) or (f)(2) 
of this AD terminates the repetitive inspections required by 
paragraph (c) of this AD.
    (1) For THSAs having P/N 47172: Modify the ball nut of the THSA, 
or replace the existing THSA with a serviceable part having P/N 
47172-300; per Airbus Service Bulletin A330-27-3085 (for Model A330 
series airplanes) or A340-27-4089 (for Model A340-313 series 
airplanes), both Revision 02, both dated September 5, 2002; as 
applicable.

    Note 3: Airbus Service Bulletins A330-27-3085 and A340-27-4089 
refer to TRW Aeronautical Systems Service Bulletin 47172-27-03 as 
the appropriate source of service information for additional 
instructions for accomplishing the modification of the ball nut of 
the THSA.

    (2) For THSAs having 47147-2XX, 47147-3XX, or P/N 47147-400 
(where ``XX'' represents any dash number): Modify the ball nut of 
the THSA, or replace the existing THSA with an improved part having 
P/N 47147-500; as applicable; per Airbus Service Bulletin A330-27-
3093 (for Model A330 series airplanes), or A340-27-4099 (for Model 
A340-200 and -300 series airplanes), both Revision 01, both dated 
September 5, 2002; as applicable.

    Note 4: Airbus Service Bulletins A330-27-3093 and A340-27-4099 
refer to TRW Aeronautical Systems Service Bulletin 47172-27-10 as 
the appropriate source of service information for additional 
instructions for accomplishing the modification of the ball nut of 
the THSA.

Previous/Concurrent Requirements

    (g) Prior to or concurrently with accomplishment of the 
requirements of paragraph (f)(2) of this AD, do all of the actions 
specified in the Accomplishment Instructions of the applicable 
Airbus service bulletins listed in Table 1 or 2 of this AD, as 
applicable, in accordance with those service bulletins.

    Note 5: Airbus Service Bulletin A330-27-3093, Revision 01, dated 
September 5, 2002; specifies that the actions in Airbus Service 
Bulletin A330-27-3052 must be accomplished previously or 
concurrently. Airbus Service Bulletin A330-27-3052, Revision 03, 
dated December 5, 2001, specifies that the actions in Airbus Service 
Bulletins A330-27-3007, A330-27-3015, A330-27-3047, A330-27-3050, 
and A330-27-3020 must be accomplished previously or concurrently.


    Note 6: Airbus Service Bulletin A340-27-4099, Revision 01, dated 
September 5, 2002, specifies that the actions in Airbus Service 
Bulletin A340-27-4059 must be accomplished previously or 
concurrently. Airbus Service Bulletin A340-27-4059, Revision 03, 
dated December 5, 2001, specifies that the actions in Airbus Service 
Bulletins A340-27-4007, A340-27-4025, A340-27-4054, A340-27-4057, 
and A340-55-4021, must be accomplished previously or concurrently.


                                       Table 1.--Previous/Concurrent Requirements for Model A330 Series Airplanes
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                                                       Additional source  of service
Airbus service  bulletin       Revision level                     Date                        Main action                       information
--------------------------------------------------------------------------------------------------------------------------------------------------------
A330-27-3052............  03.....................  December 5, 2001.................  Replace THSA with a         Lucas Aerospace Service Bulletin 47147-
                                                                                       modified THSA.              27-07.
A330-27-3007............  01.....................  September 18, 1996...............  Replace rudder servo        Samm Avionique Service Bulletin 5300-
                                                                                       controls with modified      27-24-01.
                                                                                       parts.
A330-27-3015............  Original...............  June 7, 1995.....................  Modify the control valve    Lucas Aerospace Service Bulletin 47147-
                                                                                       detent and the jamming      27-02.
                                                                                       protection device on the
                                                                                       THSA.

[[Page 17615]]

 
A330-27-3047............  01.....................  November 26, 1997................  Replace hydraulic motors    Lucas Aerospace Service Bulletin 47147-
                                                                                       on the THSA with new        27-04.
                                                                                       parts.
A330-27-3050............  Original...............  November 15, 1996................  Replace mechanical input    Lucas Aerospace Service Bulletin 47147-
                                                                                       shaft for THSA with         27-05.
                                                                                       modified part.
A330-55-3020............  01.....................  October 21, 1998.................  Perform a general visual    None.
                                                                                       inspection of the THSA
                                                                                       screw jack fitting
                                                                                       assembly for correct
                                                                                       installation of a washer;
                                                                                       and correctly install
                                                                                       washer as applicable.
--------------------------------------------------------------------------------------------------------------------------------------------------------


                                       Table 2.--Previous/Concurrent Requirements for Model A340 Series Airplanes
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                                                       Additional source  of service
Airbus service bullentin       Revision level                     Date                        Main action                       information
--------------------------------------------------------------------------------------------------------------------------------------------------------
A340-27-4059............  03.....................  December 5, 2001.................  Replace THSA with a         Lucas Aerospace Service Bulletin 47147-
                                                                                       modified THSA.              27-07.
A340-27-4007............  Original...............  April 7, 1994....................  Replace hydraulic motors    Lucas Aerospace Service Bulletin 47147-
                                                                                       on the THSA with new        27-01.
                                                                                       parts.
A340-27-4025............  Original...............  June 7, 1995.....................  Modify the control valve    Lucas Aerospace Service Bulletin 47147-
                                                                                       detent and the jamming      27-02.
                                                                                       protection device on the
                                                                                       THSA.
A340-27-4054............  01.....................  November 26, 1997................  Replace hydraulic motors    Lucas Aerospace Service Bulletin 47147-
                                                                                       on the THSA with new        27-04.
                                                                                       parts.
A340-27-4057............  Original...............  November 15, 1996................  Replace mechanical input    Lucas Aerospace Service Bulletin 47147-
                                                                                       shaft for THSA with         27-05.
                                                                                       modified part.
A340-55-4021............  01.....................  October 21, 1998.................  Perform a general visual    None.
                                                                                       inspection of the THSA
                                                                                       screw jack fitting
                                                                                       assembly for correct
                                                                                       installation of a washer;
                                                                                       and correctly install
                                                                                       washer as applicable.
--------------------------------------------------------------------------------------------------------------------------------------------------------


    Note 7: For the purposes of this AD, a general visual inspection 
is defined as: ``A visual examination of an interior or exterior 
area, installation, or assembly to detect obvious damage, failure, 
or irregularity. This level of inspection is made from within 
touching distance unless otherwise specified. A mirror may be 
necessary to enhance visual access to all exposed surfaces in the 
inspection area. This level of inspection is made under normally 
available lighting conditions such as daylight, hangar lighting, 
flashlight, or droplight and may require removal or opening of 
access panels or doors. Stands, ladders, or platforms may be 
required to gain proximity to the area being checked.''

Actions Accomplished Previously

    (h) Actions accomplished before the effective date of this AD 
per previous revisions of the service information referenced in this 
AD are acceptable for corresponding actions required by this AD as 
specified in paragraphs (h)(1), (h)(2), (h)(3), and (h)(4) of this 
AD.
    (1) Inspections and corrective actions accomplished per Airbus 
Service Bulletin A330-27-3088 (for Model A330 series airplanes) or 
A340-27-4093 (for Model A340-200 and -300 series airplanes), both 
Revision 03, both including Appendix 01, both dated October 19, 
2001; as applicable; are acceptable for compliance with paragraph 
(c) of this AD.
    (2) Inspections and corrective actions accomplished per Airbus 
Service Bulletin A330-27-3102, Revision 02, including Appendix 01; 
dated November 7, 2002 (for Model A330 series airplanes); or A340-
27-4107, Revision 03, including Appendix 01, dated December 4, 2002; 
as applicable; are acceptable for compliance with paragraph (e) of 
this AD.
    (3) Modifications accomplished per Airbus Service Bulletin A330-
27-3085 (for Model A330 series airplanes) or A340-27-4089 (for Model 
A340-313 series airplanes), both Revision 01, both dated January 23, 
2002; as applicable; are acceptable for compliance with paragraph 
(f)(1) of this AD.
    (4) Modifications accomplished per Airbus Service Bulletin A330-
27-3093 (for Model A330 series airplanes), or A340-27-4099 (for 
Model A340-200 and -300 series airplanes), both dated June 27, 2002; 
as applicable; are acceptable for compliance with paragraph (f)(2) 
of this AD.

No Reporting Required

    (i) Where Airbus Service Bulletins A330-27-3088, Revision 04, 
dated September 5, 2002; A340-27-4093, Revision 04, dated September 
5, 2002; A330-27-3102, Revision 03, dated June 20, 2003; and A340-
27-4107, Revision 04, dated June 20, 2003; describe procedures for 
completing a reporting sheet with inspection results, this AD does 
not require that action.

Alternative Methods of Compliance

    (j) In accordance with 14 CFR 39.19, the Manager, International 
Branch, ANM-116, Transport Airplane Directorate, FAA, is authorized 
to approve alternative methods of compliance for this AD.

    Note 8: The subject of this AD is addressed in French 
airworthiness directives 2002-414(B) R2 and 2002-415(B) R2, both 
dated October 30, 2002.


    Issued in Renton, Washington, on March 25, 2004.
Kevin M. Mullin,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 04-7290 Filed 4-2-04; 8:45 am]
BILLING CODE 4910-13-P