
[Federal Register Volume 76, Number 25 (Monday, February 7, 2011)]
[Proposed Rules]
[Pages 6575-6578]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 2011-2610]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2010-0673; Directorate Identifier 2009-NM-208-AD]
RIN 2120-AA64


Airworthiness Directives; BAE Systems (Operations) Limited Model 
BAe 146 and Avro 146-RJ Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

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

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SUMMARY: We are revising an earlier NPRM for the products listed above. 
This action revises the earlier NPRM by expanding the scope. This 
proposed AD results from mandatory continuing airworthiness information 
(MCAI) originated by an aviation authority of another country to 
identify and correct an unsafe condition on an aviation product. The 
MCAI describes the unsafe condition as:

    In June 2000, prompted by a crack found at the top of the Nose 
Landing Gear (NLG) oleo, BAE Systems (Operations) Ltd (BAE

[[Page 6576]]

Systems) issued Inspection Service Bulletin (ISB) ISB.32-158. * * *
    Later, as part of an accident investigation, the examination of 
a fractured NLG main fitting showed that M-D (Messier-Dowty) SB.146-
32-150 was not accomplished * * * BAE Systems determined that more 
NLG units could be similarly affected. * * *
    Subsequently, investigation and analysis by M-D identified the 
need for a reduction of the inspection threshold and the repetitive 
inspection interval for the affected NLG units. * * *
* * * * *
    * * * [I]nvestigation by M-D showed that if any undetected crack 
was present at the time of the embodiment of M-D SB 146-32-150, Part 
B or Part C, it could continue to grow while the NLG is in service 
and could lead to the failure of the main fitting and possible 
collapse of the NLG. * * * [B]AE Systems have received additional 
reports of cracked NLG main fittings. One operator reported a crack 
in a premodification main fitting. * * *
* * * * *
    Undetected cracks could lead to failure of the NLG Main Fitting 
and collapse of the NLG.
* * * * *
    The unsafe condition is cracking of the NLG, which could adversely 
affect the airplane's safe landing. The proposed AD would require 
actions that are intended to address the unsafe condition described in 
the MCAI.

DATES: We must receive comments on this proposed AD by March 24, 2011.

ADDRESSES: You may send comments by any of the following methods:
     Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the instructions for submitting comments.
     Fax: (202) 493-2251.
     Mail: U.S. Department of Transportation, Docket 
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New 
Jersey Avenue, SE., Washington, DC 20590.
     Hand Delivery: U.S. Department of Transportation, Docket 
Operations, M-30, West Building Ground Floor, Room W12-40, 1200 New 
Jersey Avenue, SE., Washington, DC, between 9 a.m. and 5 p.m., Monday 
through Friday, except Federal holidays.
    For service information identified in this proposed AD, contact BAE 
Systems (Operations) Limited, Customer Information Department, 
Prestwick International Airport, Ayrshire, KA9 2RW, Scotland, United 
Kingdom; telephone +44 1292 675207; fax +44 1292 675704; e-mail 
RApublications@baesystems.com; Internet http://www.baesystems.com/Businesses/RegionalAircraft/index.htm. You may review copies of the 
referenced service information at the FAA, Transport Airplane 
Directorate, 1601 Lind Avenue, SW., Renton, Washington. For information 
on the availability of this material at the FAA, call 425-227-1221.

Examining the AD Docket

    You may examine the AD docket on the Internet at http://www.regulations.gov; or in person at the Docket Operations office 
between 9 a.m. and 5 p.m., Monday through Friday, except Federal 
holidays. The AD docket contains this proposed AD, the regulatory 
evaluation, any comments received, and other information. The street 
address for the Docket Operations office (telephone (800) 647-5527) is 
in the ADDRESSES section. Comments will be available in the AD docket 
shortly after receipt.

FOR FURTHER INFORMATION CONTACT: Todd Thompson, Aerospace Engineer, 
International Branch, ANM-116, Transport Airplane Directorate, FAA, 
1601 Lind Avenue, SW., Renton, Washington 98057-3356; telephone (425) 
227-1175; fax (425) 227-1149.

SUPPLEMENTARY INFORMATION:

Comments Invited

    We invite you to send any written relevant data, views, or 
arguments about this proposed AD. Send your comments to an address 
listed under the ADDRESSES section. Include ``Docket No. FAA-2010-0673; 
Directorate Identifier 2009-NM-208-AD'' at the beginning of your 
comments. We specifically invite comments on the overall regulatory, 
economic, environmental, and energy aspects of this proposed AD. We 
will consider all comments received by the closing date and may amend 
this proposed AD based on those comments.
    We will post all comments we receive, without change, to http://www.regulations.gov, including any personal information you provide. We 
will also post a report summarizing each substantive verbal contact we 
receive about this proposed AD.

Discussion

    We proposed to amend 14 CFR part 39 with an earlier NPRM for the 
specified products, which was published in the Federal Register on July 
7, 2010 (75 FR 38953). That earlier NPRM proposed to supersede AD 2002-
03-10, Amendment 39-12651 (67 FR 6855, February 14, 2002), to require 
actions intended to address the unsafe condition for the products 
listed above.
    Since that NPRM was issued, we have determined that the actions 
specified in the earlier NPRM apply to all airplanes; therefore, we 
have removed from this supplemental NPRM the inspection to determine 
whether an affected nose landing gear (NLG) unit is installed. Also, we 
have determined that the compliance time for the special detailed 
inspection for cracking needs to be reduced. We have also determined 
that replacing the NLG is not a terminating action for the repetitive 
inspections.
    The European Aviation Safety Agency (EASA), which is the Technical 
Agent for the Member States of the European Community, has issued EASA 
Airworthiness Directive 2010-0202R1, dated October 14, 2010 (referred 
to after this as ``the MCAI''), to correct an unsafe condition for the 
specified products. The MCAI states:

    In June 2000, prompted by a crack found at the top of the Nose 
Landing Gear (NLG) oleo, BAE Systems (Operations) Ltd (BAE Systems) 
issued Inspection Service Bulletin (ISB) ISB.32-158. This ISB was 
classified mandatory by the United Kingdom Civil Aviation Authority 
under AD number 002-06-2000, requiring repetitive Non-Destructive 
Testing (NDT) crack inspections on the upper end of the NLG oleo. 
The AD also provided an optional terminating action for the 
repetitive inspections, by embodiment of Messier-Dowty (M-D) Service 
Bulletin (SB) SB.146-32-150.
    Later, as part of an accident investigation, the examination of 
a fractured NLG main fitting showed that M-D SB.146-32-150 was not 
accomplished, although the records indicated that it had been. BAE 
Systems determined that more NLG units could be similarly affected. 
These NLG units were overhauled at Messier Services in Sterling, 
Virginia, in the United States. To address this situation, EASA 
issued Emergency AD 2009-0043-E to require repetitive NDT 
inspections of each affected NLG unit and, if cracks are found, 
replacement with a serviceable unit, in accordance with the 
instructions of BAE Systems Alert ISB.A32-180 and M-D SB.146-32-149.
    Subsequently, investigation and analysis by M-D identified the 
need for a reduction of the inspection threshold and the repetitive 
inspection interval for the affected NLG units and replaced M-D SB 
146-32-149 with M-D SB.146-32-174. Consequently, BAE Systems SB 32-
158 was withdrawn and superseded by BAE Systems Alert ISB.A32-180 
Revision 1, which was mandated by EASA Emergency AD 2009-0197-E.
    As further information became available, BAE Systems saw a need 
to clarify the compliance instructions in the ISB and issued 
Revision 2 of Alert Service Bulletin ISB.A32-180. The layout of 
Revision 2 was no longer compatible with the instructions of EASA 
Emergency AD 2009-0197-E, so EASA issued AD 2010-0001-E which 
superseded EASA AD 2009-0197-E and which reduced the threshold and 
interval of the repetitive NDT inspections and required repetitive 
NDT inspections of each affected NLG unit and, if cracks were found, 
the replacement of the NLG with a serviceable unit.
    The optional closing action of EASA AD 2010-0001-E is embodiment 
of M-D B 146-32-150 (polishing and shot peening of the NLG main 
fitting) or confirmation that it has

[[Page 6577]]

already been accomplished, as applicable. Further investigation by 
M-D showed that if any undetected crack was present at the time of 
the embodiment of M-D SB 146-32-150, Part B or Part C, it could 
continue to grow while the NLG is in service and could lead to the 
failure of the main fitting and possible collapse of the NLG. For 
this reason, EASA issued AD 2010-0072 (and its revision 1) which 
required the introduction of repetitive NDT inspections (defined in 
BAE Systems ISB 32-181) on NLG main fittings following embodiment of 
M-D SB 146-32-150. Despite the aforementioned measures, BAE Systems 
have received additional reports of cracked NLG main fittings. One 
operator reported a crack in a pre-modification main fitting. Shot 
peening was not present, as this was a pre-modification gear, but 
the surface finish was better than that required for a post-
modification fitting. This implies that the surface finish achieved 
by the modification may not be effective in preventing cracking. In 
addition, a positive inspection return from BAE Systems ISB 32-181 
also questions whether the combination of improved surface finish 
and shot peening are effective, as a crack may have initiated from a 
surface which is compliant with the modification standard.
    It has been concluded that the polishing and the shot peening of 
the NLG main fitting embodied through M-D SB 146-32-150 are 
potentially ineffective in preventing cracks and that all NLG main 
fittings should be subject to the same 300 Flight Cycles (FC) 
repetitive inspection to ensure pre-critical crack detection.
    Undetected cracks could lead to failure of the NLG Main Fitting 
and collapse of the NLG.
    With that view, BAE Systems issued ISB.32-182 to implement this 
repetitive 300 FC inspection on all NLG main fittings regardless of 
their modification standard. ISB.32-182 supersedes existing ISBs 
A32-180 and 32-181, initially with no closing action.
    For the reasons described above, this AD supersedes EASA 
Emergency AD 2010-0001-E and EASA AD 2010-0072 Revision 1 and 
requires repetitive NDT inspections of all NLG main fittings and, if 
cracks are found, replacement of the NLG with a serviceable unit.
    This AD is revised to require corrective actions on the NLG main 
fittings and not on the whole NLGs. NLGs and NLG main fittings may 
have accumulated different flight cycle amounts.

    The unsafe condition is cracking of the NLG, which could adversely 
affect the airplane's safe landing. You may obtain further information 
by examining the MCAI in the AD docket.

Relevant Service Information

    Messier-Dowty has issued Service Bulletin 146-32-174, Revision 2, 
including Appendix A, dated August 16, 2010. The actions described in 
this service information are intended to correct the unsafe condition 
identified in the MCAI.

Comments

    We gave the public the opportunity to participate in developing 
this AD. We received no comments on the NPRM or on the determination of 
the cost to the public.

FAA's Determination and Requirements of This Proposed AD

    This product has been approved by the aviation authority of another 
country, and is approved for operation in the United States. Pursuant 
to our bilateral agreement with the State of Design Authority, we have 
been notified of the unsafe condition described in the MCAI and service 
information referenced above. We are proposing this AD because we 
evaluated all pertinent information and determined an unsafe condition 
exists and is likely to exist or develop on other products of the same 
type design.
    Certain changes described above expand the scope of the earlier 
NPRM. As a result, we have determined that it is necessary to reopen 
the comment period to provide additional opportunity for the public to 
comment on this proposed AD.

Differences Between This AD and the MCAI or Service Information

    We have reviewed the MCAI and related service information and, in 
general, agree with their substance. But we might have found it 
necessary to use different words from those in the MCAI to ensure the 
AD is clear for U.S. operators and is enforceable. In making these 
changes, we do not intend to differ substantively from the information 
provided in the MCAI and related service information.
    We might also have proposed different actions in this AD from those 
in the MCAI in order to follow FAA policies. Any such differences are 
highlighted in a Note within the proposed AD.

Costs of Compliance

    Based on the service information, we estimate that this proposed AD 
would affect 1 product of U.S. registry.
    There are no retained actions in this supplemental NPRM that are 
required by AD 2002-03-10.
    We estimate that it would take about 1 work-hour per product to 
comply with the new basic requirements of this proposed AD. The average 
labor rate is $85 per work-hour. Based on these figures, we estimate 
the cost of the proposed AD on U.S. operators to be $85.
    We have received no definitive data that would enable us to provide 
a cost estimate for the on-condition actions specified in this AD.

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 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 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. 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.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Incorporation by 
reference, 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:

[[Page 6578]]

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 FAA amends Sec.  39.13 by removing Amendment 39-12651 (67 FR 
6855, February 14, 2002) and adding the following new AD:

BAE Systems (Operations) Limited: Docket No. FAA-2010-0673; 
Directorate Identifier 2009-NM-208-AD.

Comments Due Date

    (a) We must receive comments by March 24, 2011.

Affected ADs

    (b) The AD supersedes AD 2002-03-10, Amendment 39-12651.

Applicability

    (c) This AD applies to BAE Systems (Operations) Limited Model 
BAe 146-100A, -200A, and -300A airplanes and Model Avro 146-RJ70A, 
146-RJ85A, and 146-RJ100A airplanes; certificated in any category; 
all serial numbers.

Subject

    (d) Air Transport Association (ATA) of America Code 32: Landing 
Gear.

Reason

    (e) The mandatory continuing airworthiness information (MCAI) 
states:
    In June 2000, prompted by a crack found at the top of the Nose 
Landing Gear (NLG) oleo, BAE Systems (Operations) Ltd (BAE Systems) 
issued Inspection Service Bulletin (ISB) ISB.32-158. * * *
    Later, as part of an accident investigation, the examination of 
a fractured NLG main fitting showed that M-D (Messier-Dowty) SB.146-
32-150 was not accomplished * * * BAE Systems determined that more 
NLG units could be similarly affected. * * *
    Subsequently, investigation and analysis by M-D identified the 
need for a reduction of the inspection threshold and the repetitive 
inspection interval for the affected NLG units. * * *
* * * * *
    * * * [I]nvestigation by M-D showed that if any undetected crack 
was present at the time of the embodiment of M-D SB 146-32-150, Part 
B or Part C, it could continue to grow while the NLG is in service 
and could lead to the failure of the main fitting and possible 
collapse of the NLG. * * * [B]AE Systems have received additional 
reports of cracked NLG main fittings. One operator reported a crack 
in a premodification main fitting. * * *
* * * * *
    Undetected cracks could lead to failure of the NLG Main Fitting 
and collapse of the NLG.
* * * * *
    The unsafe condition is cracking of the NLG, which could 
adversely affect the airplane's safe landing.

Compliance

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

Inspection

    (g) Before the accumulation of 5,000 total flight cycles on the 
NLG main fitting, or within 300 flight cycles after the effective 
date of this AD, whichever occurs later, do an ultrasonic inspection 
on the upper part of the NLG main fitting for any crack, in 
accordance with the Accomplishment Instructions of Messier-Dowty 
Service Bulletin 146-32-174, Revision 2, including Appendix A, dated 
August 16, 2010. Thereafter, repeat the inspection at intervals not 
to exceed 300 flight cycles.
    (h) An inspection that has been done in accordance with the 
Accomplishment Instructions of Messier-Dowty Service Bulletin 146-
32-174, Revision 1, dated September 2, 2009, or in accordance with 
the Accomplishment Instructions of Messier-Dowty Service Bulletin 
146-32-175, Revision 2, dated March 5, 2010, before the effective 
date of this AD but not more than 300 flight cycles before the 
effective date of this AD, is considered acceptable for compliance 
with the initial inspection required by paragraph (g) of this AD.

Replacement

    (i) If any crack is found from the inspections required by 
paragraph (g) of this AD, before further flight, replace the NLG 
main fitting with a serviceable NLG main fitting, using a method 
approved by the Manager, International Branch, ANM-116, Transport 
Airplane Directorate, FAA; or the European Aviation Safety Agency 
(EASA) (or its delegated agent).

    Note 1: Guidance on replacing the NLG main fitting with a 
serviceable NLG main fitting can be found in Subsection 32-20-11 of 
BAE Systems (Operations) Limited BAe 146 Series/Avro 146-RJ Series 
Aircraft Maintenance Manual 146.153, Revision 101, dated July 15, 
2010.

    (j) Replacing the NLG main fitting with a serviceable NLG main 
fitting is not a terminating action for the repetitive inspections 
required by paragraph (g) of this AD.

Parts Installation

    (k) As of the effective date of this AD, no person may install 
an affected NLG main fitting on any airplane, unless that NLG main 
fitting has been inspected in accordance with paragraph (g) of this 
AD and no cracking is found.

FAA AD Differences

    Note 2: This AD differs from the MCAI and/or service information 
as follows: No differences.

Other FAA AD Provisions

    (l) The following provisions also apply to this AD:
    (1) Alternative Methods of Compliance (AMOCs): The Manager, 
International Branch, ANM-116, Transport Airplane Directorate, FAA, 
has the authority to approve AMOCs for this AD, if requested using 
the procedures found in 14 CFR 39.19. Send information to Attn: Todd 
Thompson, Aerospace Engineer, International Branch, ANM-116, 
Transport Airplane Directorate, FAA, 1601 Lind Avenue, SW., Renton, 
Washington 98057-3356; telephone (425) 227-1175; fax (425) 227-1149. 
Before using any approved AMOC, notify your appropriate principal 
inspector, or lacking a principal inspector, the manager of the 
local flight standards district office/certificate holding district 
office. The AMOC approval letter must specifically reference this 
AD.
    (2) Airworthy Product: For any requirement in this AD to obtain 
corrective actions from a manufacturer or other source, use these 
actions if they are FAA-approved. Corrective actions are considered 
FAA-approved if they are approved by the State of Design Authority 
(or their delegated agent). You are required to assure the product 
is airworthy before it is returned to service.

Related Information

    (m) Refer to MCAI EASA Airworthiness Directive 2010-0202R1, 
dated October 14, 2010; Messier-Dowty Service Bulletin 146-32-174, 
Revision 2, including Appendix A, dated August 16, 2010; for related 
information.

    Issued in Renton, Washington, on January 28, 2011.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 2011-2610 Filed 2-4-11; 8:45 am]
BILLING CODE 4910-13-P


