[Federal Register Volume 70, Number 182 (Wednesday, September 21, 2005)]
[Proposed Rules]
[Pages 55310-55314]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 05-18793]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 2002-NM-89-AD]
RIN 2120-AA64


Airworthiness Directives; Empresa Brasileira de Aeronautica S.A. 
(EMBRAER) Model EMB-135 and -145 Series Airplanes

AGENCY: Federal Aviation Administration, Department of Transportation 
(DOT).

ACTION: Supplemental notice of proposed rulemaking; reopening of 
comment period.

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SUMMARY: This document revises an earlier proposed airworthiness 
directive (AD), applicable to certain EMBRAER Model EMB-135 and -145 
series airplanes. The proposed AD would have required performing 
repetitive inspections for cracks, ruptures, or bends in certain 
components of the elevator control system; replacing discrepant 
components; and, for certain airplanes, installing a new spring 
cartridge and implementing new logic for the electromechanical gust 
lock system. The proposed AD also would have required eventual 
modification of the elevator gust lock system to replace the mechanical 
system with an electromechanical system, which would terminate the 
repetitive inspections. This new action revises the proposed rule by 
requiring installing a new spring cartridge and implementing new logic 
for the electromechanical gust lock system on additional airplanes. The 
actions specified by this new proposed AD are intended to prevent 
discrepancies in the elevator control system, which could result in 
reduced control of the elevator and consequent reduced controllability 
of the airplane. This action is intended to address the identified 
unsafe condition.

DATES: Comments must be received by October 11, 2005.

ADDRESSES: Submit comments in triplicate to the Federal Aviation 
Administration (FAA), Transport Airplane Directorate, ANM-114, 
Attention: Rules Docket No. 2002-NM-89-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. 2002-NM-89-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 Empresa Brasileira de Aeronautica S.A. (EMBRAER), P.O. 
Box 343--CEP 12.225, Sao Jose dos Campos--SP, Brazil. 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.

[[Page 55311]]

     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 2002-NM-89-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. 2002-NM-89-AD, 1601 Lind Avenue, SW., Renton, Washington 
98055-4056.

Discussion

    A proposal to amend part 39 of the Federal Aviation Regulations (14 
CFR part 39) to add an airworthiness directive (AD), applicable to 
certain EMBRAER Model EMB-135 and -145 series airplanes, was published 
as a supplemental notice of proposed rulemaking (NPRM) in the Federal 
Register on September 22, 2004 (69 FR 56735) (referred to after this as 
``the first supplemental NPRM''). That action proposed to require 
performing repetitive inspections for cracks, ruptures, or bends in 
certain components of the elevator control system; replacing discrepant 
components; and installing a new spring cartridge and implementing new 
logic for the electromechanical gust lock system. That action also 
proposed to require eventual modification of the elevator gust lock 
system to replace the mechanical system with an electromechanical 
system, which would terminate the repetitive inspections. The proposed 
AD was prompted by a report that cracks have been found in certain 
components of the elevator control system in the horizontal stabilizer 
area of several airplanes equipped with a mechanical gust lock system. 
That condition, if not corrected, could result in discrepancies in the 
elevator control system, which could result in reduced control of the 
elevator and consequent reduced controllability of the airplane.

Explanation of New Relevant Service Information

    EMBRAER has issued Service Bulletin 145-27-0075, Revision 08, dated 
March 3, 2005. (Paragraph (c)(1) of the first supplemental NPRM refers 
to EMBRAER Service Bulletin 145-27-0075, Change 06, dated July 16, 
2002, as the applicable source of service information for the actions 
required by that paragraph.) EMBRAER Service Bulletin 145-27-0075, 
Revision 08, contains a new Part IV (originally added in Revision 07 of 
the service bulletin, March 2, 2004), which describes procedures for 
installing a new spring cartridge and implementing new logic for the 
electromechanical gust lock system. Part IV of EMBRAER Service Bulletin 
145-27-0075, Revision 08, refers to EMBRAER Service Bulletins 145-27-
0101 (currently at Revision 02, dated December 27, 2004) and 145-27-
0102 (currently at Revision 02, dated January 20, 2005) as additional 
sources of service information. We have revised paragraph (c)(1) in 
this second supplemental NPRM to require accomplishing EMBRAER Service 
Bulletin 145-27-0075, Revision 08, for the airplanes listed in that 
service bulletin. We have added paragraphs (d)(1) and (d)(2) to this 
supplemental NPRM to give credit for actions accomplished before the 
effective date of this AD in accordance with Change 06 or Revision 07 
of the service bulletin, provided that Part IV of Revision 07 or 08 is 
done. We have also added a new Note 2 in this second supplemental NPRM 
to state that EMBRAER Service Bulletin 145-27-0075, Revision 08, refers 
to EMBRAER Service Bulletins 145-27-0101 and 145-27-0102, which are 
currently at Revision 02, as additional sources of service information.
    EMBRAER has also issued Service Bulletin 145-27-0086, Change 04, 
dated March 21, 2005. (Paragraph (c)(2) of the first supplemental NPRM 
refers to EMBRAER Service Bulletin 145-27-0086, Change 02, dated 
December 23, 2003, as the applicable source of service information for 
the actions required by that paragraph.) EMBRAER Service Bulletin 145-
27-0086, Change 04, describes procedures that are similar to those in 
Change 02 of that service bulletin. We have revised paragraph (c)(2) of 
this second supplemental NPRM to refer to EMBRAER Service Bulletin 145-
27-0086, Change 04. We have also added paragraph (d)(3) to this 
supplemental NPRM to state that actions accomplished before the 
effective date of the AD in accordance with EMBRAER Service 145-27-
0086, Change 02, or Change 03, dated April 14, 2004, are acceptable for 
compliance with paragraph (c)(2) of this supplemental NPRM. We have 
also revised Note 3 of this second supplemental NPRM to state that 
EMBRAER Service Bulletin 145-27-0086, Change 04, refers to EMBRAER 
Service Bulletins 145-27-0101 and 145-27-0102, which are currently at 
Revision 02, as additional sources of service information.
    The Departmento de Aviacao Civil (DAC), which is the airworthiness 
authority for Brazil, approved EMBRAER Service Bulletin 145-27-0075, 
Revision 08, and EMBRAER Service Bulletin 145-27-0086, Change 04. The 
DAC does not intend to revise Brazilian airworthiness directive 2002-
01-01R3, dated November 8, 2002 (which the original NPRM and first 
supplemental NPRM refer to as the parallel Brazilian airworthiness 
directive), because the actions specified in EMBRAER Service Bulletins 
145-27-0101 and 145-27-0102; which have been added to EMBRAER Service 
Bulletin 145-27-0075, Revision 08, and EMBRAER Service Bulletin 145-27-
0086, Change 04; are already required by another Brazilian 
airworthiness directive, 2003-01-03 R1, dated August 26, 2004. (Also, 
2002-01-01R3 refers to EMBRAER Service Bulletin 145-27-0086, Change 01, 
and EMBRAER Service Bulletin 145-27-0075, Change 06, or further 
approved revisions, as the acceptable source of service information for 
certain actions in that airworthiness directive.)

Comments

    Interested persons have been afforded an opportunity to participate 
in the making of this amendment. Due consideration has been given to 
the comments received.

Request To Allow Installation of Other Replacement Parts

    One commenter requests that we revise paragraph (b) of the first 
supplemental NPRM to remove the reference to replacing a discrepant 
part of the elevator control system ``with a new part having the same 
part number.'' The commenter notes that this does not account for the 
possibility that part numbers will be revised in future modifications 
of the elevator control system. The commenter asks that we allow 
installation of equivalent or superseded parts as listed in the 
applicable Illustrated Parts Catalog.

[[Page 55312]]

    We agree with the commenter's request. We have revised paragraph 
(b) in this second supplemental NPRM to remove the stipulation that a 
replacement part must have the same part number.

Request To Remove Note 2 of Supplemental NPRM

    One commenter requests that we remove the reference, in Note 2 of 
the first supplemental NPRM, to EMBRAER Service Bulletin 145-22-0007 as 
an additional source of service information for reworking the control 
stand. The commenter states that the procedures in that service 
bulletin are not related to the modifications of the elevator control 
system and are instead related to rerouting the ``go around'' wires.
    We agree. Paragraph 3.C.(1) of EMBRAER Service Bulletin 145-27-
0086, Change 04, states that ``To install the new wiring guides and the 
wiring mountings of the thrust lever `go around' switch, it is 
necessary that SB 145-22-0007 be accomplished.'' (Similarly, paragraph 
3.D.(3) of EMBRAER Service Bulletin 145-27-0075, Revision 08, states 
that, for airplanes with certain control stands, 145-22-0007 ``should 
be accomplished.'') Thus, we included the reference to EMBRAER Service 
Bulletin 145-22-0007 as a convenience for operators. Upon further 
review of EMBRAER Service Bulletin 145-27-0086, Change 04; EMBRAER 
Service Bulletin 145-27-0075, Revision 08; and EMBRAER Service Bulletin 
145-22-0007; we have determined that it is not necessary to include the 
reference to EMBRAER Service Bulletin 145-22-0007 in this AD. The 
contents of Note 2 of the first supplemental NPRM have not been 
included in this second supplemental NPRM. We note, however, that if 
not doing actions specified in EMBRAER Service Bulletin 145-22-0007 
results in an inability to comply with proposed requirements of this 
AD, operators must request approval of an alternative method of 
compliance (AMOC) for the corresponding requirements of this AD.

Request To Consider AMOC for AD 2002-26-51

    One commenter notes that certain requirements proposed in the first 
supplemental NPRM should be considered an AMOC for requirements of AD 
2002-26-51, amendment 39-13008 (68 FR 488, January 6, 2003). That AD 
applies to certain EMBRAER Model EMB-135 and -145 series airplanes, and 
requires revising the Limitations section of the Airplane Flight Manual 
to advise the flightcrew of the possibility of locking of the elevator 
during takeoff and provides proper procedures to prevent it. The 
commenter notes that accomplishing EMBRAER Service Bulletin 145-27-0101 
(implementation of the new gust lock logic) eliminates the need for 
these actions.
    We agree. We have reviewed the requirements of AD 2002-26-51 and 
have determined that accomplishing EMBRAER Service Bulletin 145-27-0101 
does eliminate the need for the AFM revision required by AD 2002-26-51. 
Accordingly, we have revised paragraphs (c)(1) and (c)(2)(iv) of this 
second supplemental NPRM to specify that, after implementing the new 
gust lock logic, the AFM revision required by AD 2002-26-51 may be 
removed from the Limitations section of the AFM. In addition, we may 
consider further rulemaking action in the future to revise AD 2002-26-
51 to acknowledge that EMBRAER Service Bulletin 145-27-0101 eliminates 
the need for the AFM revision required by AD 2002-26-51.

Request To Provide Terminating Action for AD 2003-09-03

    Two commenters request that we revise AD 2003-09-03 to specify that 
accomplishing EMBRAER Service Bulletin 145-27-0086, including EMBRAER 
Service Bulletin 145-27-0102, terminates the requirements of AD 2003-
09-03, amendment 39-13132 (68 FR 22585, April 29, 2003). That AD 
applies to certain EMBRAER Model EMB-135 and -145 series airplanes and 
requires repetitive inspections of the spring cartridges of the 
elevator gust lock system, and corrective action if necessary. The 
commenters note that replacing the spring cartridges of the elevator 
gust lock system with new, improved spring cartridges, in accordance 
with EMBRAER Service Bulletin 145-27-0102, eliminates the potential for 
jamming of the elevator due to the spring cartridges unscrewing in the 
gust lock system, which is the unsafe condition that is addressed in AD 
2003-09-03. The commenters note that this terminating action has been 
added to Brazilian airworthiness directive 2003-01-03 R1. (AD 2003-09-
03 refers to the original issue of Brazilian airworthiness directive 
2003-01-03, dated February 10, 2003, as the parallel Brazilian 
airworthiness directive.)
    We agree with the commenter's request. Accomplishing EMBRAER 
Service Bulletin 145-27-0102, as specified by EMBRAER Service Bulletin 
145-27-0086, Change 04, and EMBRAER Service Bulletin 145-27-0075, 
Revision 08, as applicable, terminates the requirements of AD 2003-09-
03. We have revised paragraphs (c)(1) and (c)(2)(iv) of this second 
supplemental NPRM to state this. In addition, we may consider further 
rulemaking action in the future to revise AD 2003-09-03 to include the 
actions that were added to Brazilian airworthiness directive 2003-01-03 
R1.

Request To Consider Alternative Action

    One commenter requests that we allow operators an alternative of 
performing repetitive inspections at intervals not to exceed 500 flight 
hours instead of installing the new gust lock. The commenter states 
that the electric gust lock has a higher failure rate than the 
mechanical lock, so there should be some other solution besides 
requiring all operators to install an electric gust lock. The commenter 
also suggests that the manufacturer has sufficient time to develop a 
method of reinforcing the horizontal stabilizer to correct the problem 
rather than installing a gust lock system. The commenter also notes 
that doing the installation will cause airplanes to be out of service 
for up to a week beyond what is necessary for normal inspections.
    We do not agree with the commenter's request to add repetitive 
inspections as an alternative to replacing the mechanical elevator gust 
lock system with an electromechanical system. The commenter did not 
submit data substantiating that repetitive inspections would provide an 
acceptable level of safety. We can better ensure long-term continued 
operational safety by modifications or design changes to remove the 
source of the problem, rather than by repetitive inspections. Long-term 
inspections may not provide the degree of safety necessary for the 
transport airplane fleet. This, coupled with a better understanding of 
the human factors associated with numerous repetitive inspections, has 
led us to consider placing less emphasis on special procedures and more 
emphasis on design improvements. The proposed modification requirement 
is consistent with these considerations. We have not changed this 
second supplemental NPRM in this regard.
    Regarding the commenter's statements that there are deficiencies 
with the new gust lock system, we are not aware of any deficiencies 
with this system. We have reviewed the service history of the electric 
gust lock, and the data do not show a high failure rate. We have not 
changed this second supplemental NPRM in this regard.

[[Page 55313]]

Request To Revise Estimate of Cost Impact

    One commenter requests that we revise the Cost Impact estimate for 
the actions in EMBRAER Service Bulletin 145-27-0086. The commenter 
notes that the first supplemental NPRM estimates 133 work hours for 
these actions. The commenter recommends that we consider the 230-work-
hour estimate specified in the service bulletin. The commenter also 
states that this figure doesn't consider other service bulletins that 
need to be completed along with that service bulletin, which the 
commenter estimates could run up to 338 work hours.
    We do not agree. The 230-work-hour estimate to which the commenter 
refers includes time for disassembly and assemblage. These are 
considered incidental costs. We recognize that, in doing the actions 
required by an AD, operators may incur incidental costs in addition to 
the direct costs. The cost analysis in AD rulemaking actions, however, 
typically does not include incidental costs such as the time required 
to gain access and close up, time necessary for planning, or time 
necessitated by other administrative actions. Those incidental costs, 
which may vary significantly among operators, are almost impossible to 
calculate. The estimate of 133 work hours stated in the first 
supplemental NPRM is consistent with the estimate provided in the 
service bulletin when the incidental costs are omitted. We have not 
changed this second supplemental NPRM in this regard.

Conclusion

    Since certain changes described previously expand the scope of the 
proposed rule, the FAA has determined that it is necessary to reopen 
the comment period to provide additional opportunity for public 
comment.

Cost Impact

    We estimate that 300 airplanes of U.S. registry would be affected 
by this proposed AD.
    It would take approximately 1 work hour per airplane, per 
inspection cycle, to accomplish the proposed inspection, at an average 
labor rate is $65 per work hour. Based on these figures, the cost 
impact of this proposed action on U.S. operators is estimated to be 
$19,500, or $65 per airplane, per inspection cycle.
    We estimate that 108 airplanes of U.S. registry would be subject to 
EMBRAER Service Bulletin 145-27-0075, Revision 08. For these airplanes, 
it would take up to 65 work hours to accomplish the proposed 
modification in that service bulletin, at an average labor rate of $65 
per work hour. Required parts would cost up to $14,000 per airplane. 
Based on these figures, the cost impact of this proposed action on U.S. 
operators is estimated to be up to $1,968,300, or $18,225 per airplane.
    We estimate that 192 airplanes of U.S. registry would be subject to 
EMBRAER Service Bulletin 145-27-0086, Change 04. For these airplanes, 
it would take approximately 133 work hours to accomplish the proposed 
modification in that service bulletin, at an average labor rate of $65 
per work hour. Required parts would cost up to $23,164 per airplane. 
Based on these figures, the cost impact of this proposed action on U.S. 
operators is estimated to be up to $6,107,328, or $31,809 per airplane.
    The cost impact figures discussed above are based on assumptions 
that no operator has yet accomplished any of the 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.

Authority for This Rulemaking

    Title 49 of the United States Code specifies the FAA's authority to 
issue rules on aviation safety. Subtitle I, section 106, describes the 
authority of the FAA Administrator. Subtitle VII, Aviation Programs, 
describes in more detail the scope of the Agency's authority.
    We are issuing this rulemaking under the authority described in 
subtitle VII, part A, subpart III, section 44701, ``General 
requirements.'' Under that section, Congress charges the FAA with 
promoting safe flight of civil aircraft in air commerce by prescribing 
regulations for practices, methods, and procedures the Administrator 
finds necessary for safety in air commerce. This regulation is within 
the scope of that authority because it addresses an unsafe condition 
that is likely to exist or develop on products identified in this 
rulemaking action.

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 adding the following new 
airworthiness directive:

Empresa Brasileira De Aeronautica S.A. (EMBRAER): Docket 2002-NM-89-
AD.

    Applicability: Model EMB-135 and EMB-145 series airplanes, 
certificated in any category; serial numbers 145001 through 145189 
inclusive, 145191 through 145362 inclusive, 145364 through 145373 
inclusive, 145375, 145377 through 145411 inclusive, 145413 through 
145424 inclusive, 145426 through 145430 inclusive, 145434 through 
145436 inclusive, 145440 through 145445 inclusive, 145448, 145450, 
and 145801; equipped with a mechanical gust lock system.
    Compliance: Required as indicated, unless accomplished 
previously.
    To prevent discrepancies in the elevator control system, which 
could result in reduced control of the elevator and consequent 
reduced controllability of the airplane, accomplish the following:

Repetitive Inspections

    (a) Within 800 flight hours after the effective date of this AD, 
do a detailed

[[Page 55314]]

inspection of the elevator control system for any crack, rupture, or 
bend in any component, in accordance with the Accomplishment 
Instructions of EMBRAER Service Bulletin 145-27-0087, Change 03, 
dated September 27, 2002. Where this service bulletin specifies to 
return discrepant parts and report inspection results to the 
manufacturer, this AD does not require these actions. Repeat the 
inspection thereafter at intervals not to exceed 2,500 flight hours 
or 15 months, whichever is first.

    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.''

Replacement of Discrepant Parts

    (b) If any discrepant part is found during any inspection 
required by paragraph (a) of this AD, before further flight, replace 
the discrepant part with a new part, in accordance with the 
Accomplishment Instructions of EMBRAER Service Bulletin 145-27-0087, 
Change 03, dated September 27, 2002.

Modification

    (c) Within 10,000 flight hours or 60 months after the effective 
date of this AD, whichever is first, modify the elevator gust lock 
by accomplishing paragraph (c)(1) or (c)(2) of this AD, as 
applicable. This modification terminates the repetitive inspections 
required by paragraph (a) of this AD.
    (1) For airplanes listed in EMBRAER Service Bulletin 145-27-
0075, Revision 08, dated March 3, 2005: Do paragraph (c)(1)(i) or 
(c)(1)(ii) of this AD, as applicable, and install a new spring 
cartridge and implement new logic for the electromechanical gust 
lock system by doing all actions in section 3.D. (Part IV) of the 
Accomplishment Instructions of the service bulletin. After 
accomplishing the actions in EMBRAER Service Bulletin 145-27-0101; 
as specified in the Accomplishment Instructions of EMBRAER Service 
Bulletin 145-27-0075, Revision 08; the Airplane Flight Manual (AFM) 
revision required by AD 2002-26-51, amendment 39-13008, may be 
removed from the Limitations section of the AFM. Accomplishing the 
actions specified in the Accomplishment Instructions of EMBRAER 
Service Bulletin 145-27-0102; as specified by EMBRAER Service 
Bulletin 145-27-0075, Revision 08; terminates the repetitive 
inspections required by AD 2003-09-03, amendment 39-13132.
    (i) Replace the mechanical gust lock system with an 
electromechanical gust lock system, and replace the control stand 
with a reworked control stand, by doing all the actions (including a 
detailed inspection to ensure that certain parts have been removed 
previously per EMBRAER Service Bulletin 145-27-0076) in and per 
section 3.A. (Part I) or 3.B. (Part II) of the Accomplishment 
Instructions of the service bulletin, as applicable. If the 
inspection reveals that certain subject parts have not been removed 
previously, before further flight, remove the subject parts in 
accordance with the service bulletin. Where Parts I and II of the 
Accomplishment Instructions of the service bulletin specify to 
remove and ``send the control stand to be reworked in a workshop,'' 
replace the control stand with a control stand reworked as specified 
in the service bulletin.
    (ii) Replace the return spring and spring terminal of the gust 
lock control lever with improved parts by doing all the actions in 
and per section 3.C. (Part III) of the Accomplishment Instructions 
of the service bulletin.

    Note 2: Part IV of the Accomplishment Instructions of EMBRAER 
Service Bulletin 145-27-0075, Revision 08, refers to EMBRAER Service 
Bulletin 145-27-0101, currently at Revision 02, dated December 27, 
2004; and EMBRAER Service Bulletin 145-27-0102, currently at 
Revision 02, dated January 20, 2005; as additional sources of 
instructions for accomplishing the installation of a new spring 
cartridge and implementation of the new logic for the 
electromechanical gust lock system.

    (2) For airplanes listed in EMBRAER Service Bulletin 145-27-
0086, Change 04, dated April 14, 2004: Do paragraphs (c)(2)(i), 
(c)(2)(ii), (c)(2)(iii), and (c)(2)(iv) of this AD, as applicable.
    (i) Rework the tail carbon box and the horizontal stabilizer by 
doing all the actions (including the inspection for delamination) in 
and per section 3.A. (Part I) of the Accomplishment Instructions of 
the service bulletin. If any delamination is found that is outside 
the limits specified in the service bulletin, before further flight, 
repair per a method approved by either the FAA or the Departmento de 
Aviacao Civil (or its delegated agent).
    (ii) Install wiring and electrical components by doing all the 
actions in and per section 3.B. (Part II) of the Accomplishment 
Instructions of the service bulletin.
    (iii) Install and activate the electromechanical gust lock 
system by doing all actions in section 3.D. (Part IV) of the 
Accomplishment Instructions of the service bulletin. Where Part IV 
of the Accomplishment Instructions of the service bulletin specifies 
to remove and ``send the control stand to be reworked in a 
workshop,'' replace the control stand with a control stand reworked 
as specified in Part III of the service bulletin.
    (iv) Install a new spring cartridge and implement new logic for 
the electromechanical gust lock system by doing all actions in 
section 3.E. (Part V) of the Accomplishment Instructions of the 
service bulletin, as applicable. After accomplishing the actions in 
EMBRAER Service Bulletin 145-27-0101; as specified in the 
Accomplishment Instructions of EMBRAER Service Bulletin 145-27-0086, 
Change 04; the AFM revision required by AD 2002-26-51, amendment 39-
13008, may be removed from the Limitations section of the AFM. 
Accomplishing the actions in EMBRAER Service Bulletin 145-27-0102; 
as specified in the Accomplishment Instructions of EMBRAER Service 
Bulletin 145-27-0086, Change 04; terminates the repetitive 
inspections required by AD 2003-09-03, amendment 39-13132.

    Note 3: Part V of the Accomplishment Instructions of EMBRAER 
Service Bulletin 145-27-0086, Change 04, refers to EMBRAER Service 
Bulletin 145-27-0101, currently at Revision 02, dated December 27, 
2004; and EMBRAER Service Bulletin 145-27-0102, currently at 
Revision 02, dated January 20, 2005; as additional sources of 
instructions for accomplishing the installation of a new spring 
cartridge and implementation of the new logic for the 
electromechanical gust lock system.

Actions Accomplished Previously

    (d) Actions accomplished before the effective date of this AD 
are acceptable for compliance with corresponding requirements of 
this AD as specified in paragraphs (d)(1), (d)(2), and (d)(3) of 
this AD.
    (1) Modification of the elevator gust lock system before the 
effective date of this AD in accordance with EMBRAER Service 
Bulletin 145-27-0075, Change 06, dated July 16, 2002, is acceptable 
for compliance with paragraph (c)(1) of this AD, provided that, 
within the compliance time specified in paragraph (c) of this AD, a 
new spring cartridge is installed and new logic for the 
electromechanical gust lock system is implemented in accordance with 
Part IV of EMBRAER Service Bulletin 145-27-0075, Revision 07, dated 
March 2, 2004, or Revision 08, dated March 3, 2005.
    (2) Modification of the elevator gust lock system before the 
effective date of this AD in accordance with EMBRAER Service 
Bulletin 145-27-0075, Revision 07, dated March 2, 2004, is 
acceptable for compliance with paragraph (c)(1) of this AD.
    (3) Modification of the elevator gust lock system before the 
effective date of this AD in accordance with EMBRAER Service 
Bulletin 145-27-0086, Change 02, dated December 23, 2003; or EMBRAER 
Service Bulletin 145-27-0086, Change 03, dated April 14, 2004; is 
acceptable for compliance with paragraph (c)(2) of this AD.

Alternative Methods of Compliance

    (e) 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 4: The subject of this AD is addressed in Brazilian 
airworthiness directive 2002-01-01R3, dated November 8, 2002.


    Issued in Renton, Washington, on September 9, 2005.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 05-18793 Filed 9-20-05; 8:45 am]
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