[Federal Register Volume 71, Number 95 (Wednesday, May 17, 2006)]
[Proposed Rules]
[Pages 28611-28615]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: E6-7481]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2006-24779; Directorate Identifier 2006-NM-044-AD]
RIN 2120-AA64


Airworthiness Directives; Airbus Model A300 Airplanes; Model A310 
Airplanes; and Model A300 B4-600, B4-600R, and F4-600R Series Airplanes 
and Model C4-605R Variant F Airplanes (Collectively Called A300-600 
Series Airplanes)

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

ACTION: Notice of proposed rulemaking (NPRM).

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SUMMARY: The FAA proposes to adopt a new airworthiness directive (AD) 
for all Airbus Model A300 airplanes and Model A310 airplanes and for 
certain Airbus Model A300-600 series airplanes. This proposed AD would 
require an inspection of the wing and center fuel tanks to determine if 
certain P-clips are installed and corrective action if necessary. This 
proposed AD also would require an inspection of electrical bonding 
points of certain equipment in the center fuel tank for the presence of 
a blue coat and related investigative and corrective actions if 
necessary. This proposed AD also would require installation of new 
bonding leads and electrical bonding points on certain equipment in the 
wing, center, and trim fuel tanks, as necessary. This proposed AD 
results from fuel system reviews conducted by the manufacturer. We are 
proposing this AD to ensure continuous electrical bonding protection of 
equipment in the wing, center, and trim fuel tanks and to prevent 
damage to wiring in the wing and center fuel tanks, due to failed P-
clips used for retaining the wiring and pipes, which could result in a 
possible fuel ignition source in the fuel tanks.

DATES: We must receive comments on this proposed AD by June 16, 2006.

ADDRESSES: Use one of the following addresses to submit comments on 
this proposed AD.
     DOT Docket Web site: Go to http://dms.dot.gov and follow 
the instructions for sending your comments electronically.
     Government-wide rulemaking web site: Go to http://www.regulations.gov and follow the instructions for sending your 
comments electronically.
     Mail: Docket Management Facility, U.S. Department of 
Transportation, 400 Seventh Street, SW., Nassif Building, room PL-401, 
Washington, DC 20590.
     Fax: (202) 493-2251.
     Hand Delivery: Room PL-401 on the plaza level of the 
Nassif Building, 400 Seventh Street, SW., Washington, DC, between 9 
a.m. and 5 p.m., Monday through Friday, except Federal holidays.
    Contact Airbus, 1 Rond Point Maurice Bellonte, 31707 Blagnac Cedex, 
France,

[[Page 28612]]

for service information identified in this proposed AD.

FOR FURTHER INFORMATION CONTACT: Tom Stafford, Aerospace Engineer, 
International Branch, ANM-116, Transport Airplane Directorate, FAA, 
1601 Lind Avenue, SW., Renton, Washington 98055-4056; telephone (425) 
227-1622; fax (425) 227-1149.

SUPPLEMENTARY INFORMATION: 

Comments Invited

    We invite you to submit any relevant written data, views, or 
arguments regarding this proposed AD. Send your comments to an address 
listed in the ADDRESSES section. Include the docket number ``FAA-2006-
24779; Directorate Identifier 2006-NM-044-AD'' at the beginning of your 
comments. We specifically invite comments on the overall regulatory, 
economic, environmental, and energy aspects of the proposed AD. We will 
consider all comments received by the closing date and may amend the 
proposed AD in light of those comments.
    We will post all comments we receive, without change, to http://dms.dot.gov, including any personal information you provide. We will 
also post a report summarizing each substantive verbal contact with FAA 
personnel concerning this proposed AD. Using the search function of 
that web site, anyone can find and read the comments in any of our 
dockets, including the name of the individual who sent the comment (or 
signed the comment on behalf of an association, business, labor union, 
etc.). You may review the DOT's complete Privacy Act Statement in the 
Federal Register published on April 11, 2000 (65 FR 19477-78), or you 
may visit http://dms.dot.gov.

Examining the Docket

    You may examine the AD docket on the Internet at http://dms.dot.gov, or in person at the Docket Management Facility office 
between 9 a.m. and 5 p.m., Monday through Friday, except Federal 
holidays. The Docket Management Facility office (telephone (800) 647-
5227) is located on the plaza level of the Nassif Building at the DOT 
street address stated in the ADDRESSES section. Comments will be 
available in the AD docket shortly after the Docket Management System 
receives them.

Discussion

    The FAA has examined the underlying safety issues involved in fuel 
tank explosions on several large transport airplanes, including the 
adequacy of existing regulations, the service history of airplanes 
subject to those regulations, and existing maintenance practices for 
fuel tank systems. As a result of those findings, we issued a 
regulation titled ``Transport Airplane Fuel Tank System Design Review, 
Flammability Reduction and Maintenance and Inspection Requirements'' 
(67 FR 23086, May 7, 2001). In addition to new airworthiness standards 
for transport airplanes and new maintenance requirements, this rule 
included Special Federal Aviation Regulation No. 88 (``SFAR 88,'' 
Amendment 21-78, and subsequent Amendments 21-82 and 21-83).
    Among other actions, SFAR 88 requires certain type design (i.e., 
type certificate (TC) and supplemental type certificate (STC)) holders 
to substantiate that their fuel tank systems can prevent ignition 
sources in the fuel tanks. This requirement applies to type design 
holders for large turbine-powered transport airplanes and for 
subsequent modifications to those airplanes. It requires them to 
perform design reviews and to develop design changes and maintenance 
procedures if their designs do not meet the new fuel tank safety 
standards. As explained in the preamble to the rule, we intended to 
adopt airworthiness directives to mandate any changes found necessary 
to address unsafe conditions identified as a result of these reviews. 
In evaluating these design reviews, we have established four criteria 
intended to define the unsafe conditions associated with fuel tank 
systems that require corrective actions. The percentage of operating 
time during which fuel tanks are exposed to flammable conditions is one 
of these criteria. The other three criteria address the failure types 
under evaluation: Single failures, single failures in combination with 
a latent condition(s), and in-service failure experience. For all four 
criteria, the evaluations included consideration of previous actions 
taken that may mitigate the need for further action.
    The Joint Aviation Authorities (JAA) has issued a regulation that 
is similar to SFAR 88. (The JAA is an associated body of the European 
Civil Aviation Conference (ECAC) representing the civil aviation 
regulatory authorities of a number of European States who have agreed 
to co-operate in developing and implementing common safety regulatory 
standards and procedures.) Under this regulation, the JAA stated that 
all members of the ECAC that hold type certificates for transport 
category airplanes are required to conduct a design review against 
explosion risks.
    We have determined that the actions identified in this AD are 
necessary to reduce the potential of ignition sources inside fuel 
tanks, which, in combination with flammable fuel vapors, could result 
in fuel tank explosions and consequent loss of the airplane.
    The Direction G[eacute]n[eacute]rale de l'Aviation Civile (DGAC), 
which is the airworthiness authority for France, notified us that an 
unsafe condition may exist on all Airbus Model A300 airplanes and A310 
airplanes and on certain Model A300 B4-600, B4-600R, and F4-600R series 
airplanes and Model C4-605R Variant F airplanes (collectively called 
A300-600 series airplanes). The DGAC advises that the inserts on 
NSA5516-XXND and NSA5516-XXNJ type P-clips, which are used to retain 
wiring and pipes in wing and center fuel tanks, may swell and soften 
when immersed in fuel or fuel vapor. Investigation revealed that failed 
P-clips could chafe through the insulation of the wiring. Damage to 
wiring in the wing and center fuel tanks, if not corrected, could 
result in a possible fuel ignition source in the fuel tanks.
    The DGAC advises that, as a result of fuel system reviews conducted 
by the manufacturer, continuous electrical bonding protection of 
equipment in the wing, center, and trim fuel tanks, as applicable, is 
also necessary to ensure that the unsafe condition of this AD is 
addressed.

Relevant Service Information

    Airbus has issued the following service bulletins:

----------------------------------------------------------------------------------------------------------------
                                                  Airbus service
                    Airbus--                        bulletin--                        Dated--
----------------------------------------------------------------------------------------------------------------
Model A300 airplanes...........................      A300-28-0079  September 29, 2005.
                                                     A300-28-0081  July 20, 2005.
Model A310 airplanes...........................      A310-28-2142  August 26, 2005.
                                                     A310-28-2143  July 20, 2005.
                                                     A310-28-2153  July 20, 2005.

[[Page 28613]]

 
Model A300-600 series airplanes................      A300-28-6064  July 28, 2005.
                                                     A300-28-6068  July 20, 2005.
                                                     A300-28-6077  July 25, 2005.
----------------------------------------------------------------------------------------------------------------

    Service Bulletins A300-28-0081, A300-28-6068, and A310-28-2143 
describe procedures for inspecting the left and right wing fuel tanks 
and center fuel tank to determine if any NSA5516-XXND and NSA5516-XXNJ 
type P-clips are installed for retaining wiring and pipes in any tank 
and corrective action if necessary. The corrective action is to replace 
any NSA5516-XXND and NSA5516-XXNJ type P-clips with NSA5516-XXNF type 
P-clips.
    Service Bulletins A300-28-0079, A300-28-6064, and A310-28-2142 
describe procedures for checking the electrical bonding points of 
certain equipment in the center fuel tank for the presence of a blue 
coat and doing related investigative and corrective actions if 
necessary. The related investigative action is to measure the 
electrical resistance between the equipment and structure, if a blue 
coat is not present. The corrective action is to electrically bond the 
equipment, if the measured resistance is greater than 10 milliohms. 
Service Bulletins A300-28-0079, A300-28-6064, and A310-28-2142 also 
describe procedures for installing new bonding leads and electrical 
bonding points on certain equipment in the left and right wing fuel 
tanks and center fuel tank.
    Service Bulletin A310-28-2153 describes procedures for installing 
new bonding lead(s) on the water drain system of the trim fuel tank and 
installing electrical bonding points on the ventilation intake system, 
vent float valves, ventilation system at numerous positions, water 
drain valve, water drain system, adapter-bulkhead, indicator-magnetic 
level, and scavenger fuel pump of the trim fuel tank.
    Service Bulletin A300-28-6077 describes procedures for installing 
new bonding lead(s) on the water drain system of the trim fuel tank and 
installing electrical bonding points on the ventilation intake system, 
vent float valves, ventilation system at numerous positions, water 
drain valve, water drain system, adapter-bulkhead, and indicator-
magnetic level of the trim fuel tank, for configuration 01 and 02 
airplanes. Service Bulletin A300-28-6077 also describes procedures for 
installing electrical bonding points on the scavenger fuel pump of the 
trim fuel tank on configuration 03 airplanes and installing electrical 
bonding on the ventilation intake system of the trim fuel tank on 
configuration 04 airplanes.
    Accomplishing the actions specified in the service information is 
intended to adequately address the unsafe condition. The DGAC mandated 
the service information and issued airworthiness directive F-2006-031, 
dated February 1, 2006, to ensure the continued airworthiness of these 
airplanes in France.

FAA's Determination and Requirements of the Proposed AD

    These airplane models are manufactured in France and are type 
certificated for operation in the United States under the provisions of 
Sec.  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. We have examined the DGAC's findings, 
evaluated all pertinent information, and determined that we need to 
issue an AD for airplanes of this type design that are certificated for 
operation in the United States.
    Therefore, we are proposing this AD, which would require 
accomplishing the actions specified in the service information 
described previously, except as discussed under ``Differences Between 
the Proposed AD and French Airworthiness Directive.''

Differences Between the Proposed AD and French Airworthiness Directive

    The applicability of French airworthiness directive F-2006-031 
excludes A300 airplanes on which Airbus Service Bulletins A300-28-0079 
and A300-28-0081 were accomplished in service. French airworthiness 
directive F-2006-031 also excludes A310 airplanes on which Airbus 
Service Bulletins A310-28-2142 and A310-28-2143 were accomplished in 
service and, for airplanes equipped with trim fuel tanks, on which 
Airbus Service Bulletin A310-28-2153 was accomplished in service. 
However, we have not excluded those airplanes in the applicability of 
this proposed AD; rather, this proposed AD includes a requirement to 
accomplish the actions specified in those service bulletins, as 
applicable. This requirement would ensure that the actions specified in 
the service bulletins and required by this proposed AD are accomplished 
on all affected airplanes. Operators must continue to operate the 
airplane in the configuration required by this proposed AD unless an 
alternative method of compliance is approved. These differences have 
been coordinated with the DGAC.
    The applicability of French airworthiness directive F-2006-031 
excludes A300-600 airplanes not equipped with trim fuel tanks that have 
received Airbus Modifications 12308 and 12495 in production. French 
airworthiness directive F-2006-031 also excludes A300-600 airplanes 
equipped with trim fuel tanks that have received Airbus Modifications 
12308, 12495, 12294, and 12476 in production. However, the DGAC has 
informed us that the applicability of French airworthiness directive F-
2006-031 should have excluded A300-600 airplanes not equipped with trim 
fuel tanks on which Airbus Modifications 12226, 12365, and 12308 have 
been incorporated in production and A300-600 airplanes equipped with 
trim fuel tanks on which Airbus Modifications 12226, 12365, 12308, 
12294, and 12476 have been incorporated in production; therefore, we 
have excluded these airplanes in the applicability of this proposed AD.

Clarification of Inspection Terminology

    The ``inspection'' specified in Service Bulletins A300-28-0081, 
A300-28-6068, and A310-28-2143 and the ``check'' specified in Service 
Bulletins A300-28-0079, A300-28-6064, and A310-28-2142 are referred to 
as a ``general visual inspection'' in this proposed AD. We have 
included the definition for a detailed inspection in a note in this 
proposed AD.

Costs of Compliance

    There are about 29 Model A300 airplanes, 63 Model 310 airplanes, 
and 102 Model A300-600 series airplanes of the affected design in the 
worldwide fleet. The following table provides the estimated costs, at 
an average labor rate of $80 per hour, for U.S. operators to comply 
with this proposed AD. For some actions, the estimated work hours and 
cost of parts in the following table depend on the airplane 
configuration.

[[Page 28614]]



                                                                     Estimated Costs
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                                                   Number of
                                                           Work                                                      U.S.-
              Model                       Action          hours              Parts            Cost per airplane   registered           Fleet cost
                                                                                                                   airplanes
--------------------------------------------------------------------------------------------------------------------------------------------------------
A300 airplanes...................  Inspect wing and            40  None....................              $3,200            29                    $92,800
                                    center fuel tanks
                                    for P-clips.
                                   Install bonding        136-155  $3,800-$5,200...........     $14,680-$17,600            29          $425,720-$510,400
                                    leads/points in
                                    wing and center
                                    fuel tank.
A310 airplanes...................  Inspect wing and            40  None....................              $3,200            63                   $201,600
                                    center fuel tanks
                                    for P-clips.
                                   Install bonding        248-285  $8,840-$9,190...........     $28,680-$31,990            63      $1,806,840-$2,015,370
                                    leads/points in
                                    wing and center
                                    fuel tank.
                                   Inspect and install      53-61  $50-$70.................       $4,290-$4,950            63          $270,270-$311,850
                                    bonding leads/
                                    points in the trim
                                    fuel tank.
A300-600 series airplanes........  Inspect wing and            40  None....................              $3,200           102                   $326,400
                                    center fuel tanks   .........  ........................  ..................  ............  .........................
                                    for P-clips.          157-185  $8,840-$9,190...........     $21,400-$23,990           102      $2,182,800-$2,446,980
                                   Install bonding
                                    leads/points in
                                    wing and center
                                    fuel tank.
                                   Inspect and install       2-61  $50-$70.................         $210-$4,950           102           $21,420-$504,900
                                    bonding leads/
                                    points in the trim
                                    fuel tank.
--------------------------------------------------------------------------------------------------------------------------------------------------------

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 Findings

    We have determined that this proposed AD would not have federalism 
implications under Executive Order 13132. This proposed AD 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.
    For the reasons discussed above, I certify that the 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. 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.
    We prepared a regulatory evaluation of the estimated costs to 
comply with this proposed AD and placed it in the AD docket. See the 
ADDRESSES section for a location to examine the regulatory evaluation.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Safety.

The Proposed Amendment

    Accordingly, under the authority delegated to me by the 
Administrator, the FAA proposes to amend 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. The Federal Aviation Administration (FAA) amends Sec.  39.13 by 
adding the following new airworthiness directive (AD):

Airbus: Docket No. FAA-2006-24779; Directorate Identifier 2006-NM-
044-AD.

Comments Due Date

    (a) The FAA must receive comments on this AD action by June 16, 
2006.

Affected ADs

    (b) None.

Applicability

    (c) This AD applies to the Airbus airplanes identified in 
paragraphs (c)(1) and (c)(2) of this AD, certificated in any 
category.
    (1) All Model A300 airplanes and Model A310 airplanes.
    (2) Model A300 B4-601, B4-603, B4-620, and B4-622 airplanes; 
Model A300 B4-605R and B4-622R airplanes; Model A300 F4-605R and F4-
622R airplanes; and Model A300 C4-605R Variant F airplanes; except 
those airplanes identified in paragraphs (c)(2)(i) and (c)(2)(ii) of 
this AD.
    (i) Airplanes not equipped with trim fuel tanks on which Airbus 
Modifications 12226, 12365, and 12308 have been incorporated in 
production.
    (ii) Airplanes equipped with trim fuel tanks on which Airbus 
Modifications 12226, 12365, 12308, 12294, and 12476 have been 
incorporated in production.

Unsafe Condition

    (d) This AD results from fuel system reviews conducted by the 
manufacturer. We are issuing this AD to ensure continuous electrical 
bonding protection of equipment in the wing, center, and trim fuel 
tanks and to prevent damage to wiring in the wing and center fuel 
tanks, due to failed P-clips used for retaining the wiring and 
pipes, which could result in a possible fuel ignition source in the 
fuel tanks.

Compliance

    (e) You are responsible for having the actions required by this 
AD performed within the compliance times specified, unless the 
actions have already been done.

[[Page 28615]]

Service Bulletin References

    (f) The term ``service bulletin,'' as used in this AD, means the 
Accomplishment Instructions of the service bulletin identified in 
Table 1 of this AD, as applicable.

                                      Table 1.--Service Bulletin References
----------------------------------------------------------------------------------------------------------------
                                          And the actions      Airbus service
            For Airbus--                  specified in--         bulletin--                 Dated--
----------------------------------------------------------------------------------------------------------------
Model A300 airplanes................  paragraph (g) of this      A300-28-0081  July 20, 2005.
                                       AD.
                                      paragraph (h) of this      A300-28-0079  September 29, 2005.
                                       AD.
Model A310 airplanes................  paragraph (g) of this      A310-28-2143  July 20, 2005.
                                       AD.
                                      paragraph (h) of this      A310-28-2142  August 26, 2005.
                                       AD.
                                      paragraph (i) of this      A310-28-2153  July 20, 2005.
                                       AD.
Model A300 B4-601, B4-603, B4-620,    paragraph (g) of this      A300-28-6068  July 20, 2005.
 and B4-622 airplanes; Model A300 B4-  AD.
 605R and B4-622R airplanes; Model
 A300 F4-605R and F4-622R airplanes;
 and Model A300 C4-605R Variant F
 airplanes.
                                      paragraph (h) of this      A300-28-6064  July 28, 2005.
                                       AD.
                                      paragraph (i) of this      A300-28-6077  July 25, 2005.
                                       AD.
----------------------------------------------------------------------------------------------------------------

Inspection and Corrective Actions

    (g) Within 59 months after the effective date of this AD: Do a 
general visual inspection of the right and left wing fuel tanks and 
center fuel tank, if applicable, to determine if any NSA5516-XXND 
and NSA5516-XXNJ type P-clips are installed for retaining wiring and 
pipes in any tank, and do all applicable corrective actions before 
further flight after the inspection, by accomplishing all the 
actions specified in the service bulletin.

    Note 1: For the purposes of this AD, a general visual inspection 
is: ``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 
ensure visual access to all 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.''

Installation of Bonding Leads and Points for Wing and Center Fuel Tanks

    (h) Within 59 months after the effective date of this AD: Do the 
actions specified in paragraphs (h)(1) and (h)(2) of this AD, by 
accomplishing all the actions specified in the service bulletin.
    (1) In the center fuel tank, if applicable, do a general visual 
inspection of the electrical bonding points of the equipment 
identified in the service bulletin for the presence of a blue coat, 
and do all related investigative and corrective actions before 
further flight after the inspection.
    (2) In the left and right wing fuel tanks and center fuel tank, 
if applicable, install bonding leads and electrical bonding points 
on the equipment identified in the service bulletin.

Installation of Bonding Leads and Points for the Trim Fuel Tank

    (i) For Model A310 airplanes; Model A300 B4-601, B4-603, B4-620, 
and B4-622 airplanes; Model A300 B4-605R and B4-622R airplanes; 
Model A300 F4-605R and F4-622R airplanes; and Model A300 C4-605R 
Variant F airplanes; equipped with a trim fuel tank: Within 59 
months after the effective date of this AD, install a new bonding 
lead(s) on the water drain system of the trim fuel tank and install 
electrical bonding points on the equipment identified in the service 
bulletin in the trim fuel tank, by accomplishing all the actions 
specified in the service bulletin, as applicable.

Parts Installation

    (j) As of the effective date of this AD, no person may install 
any NSA5516-XXND or NSA5516-XXNJ type P-clip for retaining wiring 
and pipes in any wing, center, or trim fuel tank, on any airplane.

Alternative Methods of Compliance (AMOCs)

    (k)(1) The Manager, International Branch, ANM-116, Transport 
Airplane Directorate, FAA, has the authority to approve AMOCs for 
this AD, if requested in accordance with the procedures found in 14 
CFR 39.19.
    (2) Before using any AMOC approved in accordance with Sec.  
39.19 on any airplane to which the AMOC applies, notify the 
appropriate principal inspector in the FAA Flight Standards 
Certificate Holding District Office.

Related Information

    (l) French airworthiness directive F-2006-031, dated February 1, 
2006, also addresses the subject of this AD.

    Issued in Renton, Washington, on May 8, 2006.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. E6-7481 Filed 5-16-06; 8:45 am]
BILLING CODE 4910-13-P