
[Federal Register Volume 75, Number 79 (Monday, April 26, 2010)]
[Proposed Rules]
[Pages 21528-21530]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 2010-9572]



[[Page 21528]]

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

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2010-0433; Directorate Identifier 2009-NM-117-AD]
RIN 2120-AA64


Airworthiness Directives; McDonnell Douglas Corporation Model MD-
90-30 Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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

SUMMARY: We propose to adopt a new airworthiness directive (AD) for 
certain Model MD-90-30 airplanes. This proposed AD would require 
inspecting for corrosion of the retract cylinder support fitting for 
the main landing gear (MLG) and the mating bore for the support fitting 
in the MLG trunnion fitting and performing corrective actions if 
necessary, and replacing cadmium-plated retract cylinder support 
bushings and bearings. This proposed AD results from reports of the 
retract cylinder support fitting for the MLG failing during gear 
extension and subsequently damaging the hydraulic system. We are 
proposing this AD to prevent corrosion and damage that could compromise 
the integrity of the retract cylinder support fitting for the MLG, 
which could adversely affect the airplane's safe landing.

DATES: We must receive comments on this proposed AD by June 10, 2010.

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 W12-140, 1200 New 
Jersey Avenue SE., Washington, DC 20590, between 9 a.m. and 5 p.m., 
Monday through Friday, except Federal holidays.
    For service information identified in this proposed AD, contact 
Boeing Commercial Airplanes, Attention: Data & Services Management, 
3855 Lakewood Boulevard, MC D800-0019, Long Beach, California 90846-
0001; telephone 206-544-5000, extension 2; fax 206-766-5683; e-mail 
dse.boecom@boeing.com; Internet https://www.myboeingfleet.com. 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 Management Facility 
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 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: Roger Durbin, Aerospace Engineer, 
Airframe Branch, ANM-120L, FAA, Los Angeles Aircraft Certification 
Office, 3960 Paramount Boulevard, Lakewood, California 90712-4137; 
telephone (562) 627-5233; fax (562) 627-5210.

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-2010-0433; 
Directorate Identifier 2009-NM-117-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 because of 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 have received reports of failure of the retract cylinder support 
fitting for the main landing gear (MLG) during gear extension, damaging 
the hydraulic system on McDonnell Douglas Corporation MD-80 series 
airplanes. This condition, if not corrected, could result in corrosion 
and damage that could compromise the integrity of the retract cylinder 
support fitting for the MLG, which could subsequently damage the 
hydraulic system and adversely affect the airplane's ability to make a 
safe landing.
    The retract cylinder support fittings for the MLG on McDonnell 
Douglas Model MD-80 series airplanes have the same design as those 
installed on Model MD-90-30 airplanes. Therefore, Model MD-90-30 
airplanes may be subject to the identified unsafe condition.

Relevant Service Information

    We have reviewed Boeing Service Bulletin MD90-57-016, Revision 2, 
dated April 28, 2006. The service bulletin describes procedures for 
doing a general visual inspection of the cylinder bore in the MLG 
support for corrosion, and performing corrective actions if necessary.
    Corrective actions include the following:
     For airplanes on which a cadmium-plated fitting is 
installed with or without corrosion present: Replacing the cadmium-
plated retract cylinder support fitting for the MLG with an electroless 
nickel-plated fitting, and replacing the cadmium-plated retract 
cylinder support bushings and bearings for the MLG with bushings and 
bearings having no cadmium plating in the bore.
     For airplanes on which an electroless nickel-plated 
fitting is installed with no corrosion present: Installing the retained 
electroless nickel-plated retract cylinder support fitting for the MLG, 
and replacing the cadmium-plated retract cylinder support bushings and 
bearings for the MLG with bushings and bearings having no cadmium 
plating in the bore.
     For airplanes on which the electroless nickel plated 
fitting is installed with corrosion present: Replacing the electroless 
nickel-plated retract cylinder support fitting for the MLG, and 
replacing the cadmium-plated retract cylinder support bushings and 
bearings for the MLG with bushings and bearings having no cadmium 
plating in the bore.
    For airplanes on which an electroless nickel-plated fitting is 
installed in accordance with a previous issue of the service bulletin, 
no further work is required if the following actions have been 
accomplished.
     An inspection for corrosion and damage of the cylinder 
bore in the MLG support has been performed.
     The cadmium-plated retract cylinder support fitting for 
the MLG has been replaced with an electroless nickel-plated fitting.
     An electroless nickel-plated retract cylinder support 
fitting for the MLG is already installed and has no corrosion.

[[Page 21529]]

     The cadmium-plated retract cylinder support bushings and 
bearings for the MLG have been replaced with bushings and bearings with 
no cadmium plating in the bore.
    For airplanes on which the cadmium-plated fitting is installed, and 
on which the cadmium-plated retract cylinder support fitting for the 
MLG was reinstalled and on which a previous issue of the service 
bulletin was performed, the service bulletin specifies:
     Removing the cadmium-plated retract cylinder support 
fitting for the MLG and replacing with an electroless nickel-plated 
fitting.
     Verifying that the cadmium-plated retract cylinder support 
bushings and bearings for the MLG have been replaced with bushings and 
bearings with no cadmium plating in the bore.

FAA's Determination and Requirements of this Proposed AD

    We are proposing this AD because we evaluated all relevant 
information and determined the unsafe condition described previously is 
likely to exist or develop in other products of these same type 
designs. This proposed AD would require accomplishing the actions 
specified in the service information described previously.

Costs of Compliance

    We estimate that this proposed AD would affect 16 airplanes of U.S. 
registry. The following table provides the estimated costs for U.S. 
operators to comply with this proposed AD.

                                                                 Table--Estimated Costs
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                                                          Number of U.S.-
                         Action                             Work hours     Average labor       Parts         Cost per       registered      Fleet cost
                                                                           rate per hour                      product        airplanes
--------------------------------------------------------------------------------------------------------------------------------------------------------
Inspection..............................................               1             $85              $0             $85              16          $1,360
Replacement.............................................               8              85          24,580          25,260              16         404,160
--------------------------------------------------------------------------------------------------------------------------------------------------------

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.
    You can find our regulatory evaluation and the estimated costs of 
compliance 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:

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 adding the following new AD:

McDonnell Douglas Corporation: Docket No. FAA-2010-0433; Directorate 
Identifier 2009-NM-117-AD.

Comments Due Date

    (a) We must receive comments by June 10, 2010.

Affected ADs

    (b) None.

Applicability

    (c) This AD applies to McDonnell Douglas Corporation Model MD-
90-30 airplanes, certificated in any category, as identified in 
Boeing Service Bulletin MD90-57-016, Revision 2, dated April 28, 
2006.

Subject

    (d) Air Transport Association (ATA) of America Code 57: Wings.

Unsafe Condition

    (e) This AD results from reports of the retract cylinder support 
fitting for the main landing gear (MLG) failing during gear 
extension, and subsequently damaging the hydraulic system. The 
Federal Aviation Administration is issuing this AD to prevent 
corrosion and damage that could compromise the integrity of the 
retract cylinder support fitting for the MLG, 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 and Corrective Actions

    (g) Before the accumulation of 30,000 total flight hours, or 
within 15,000 flight hours after the effective date of this AD, 
whichever occurs later, do a general visual inspection of the 
retract cylinder support fitting for the MLG and the mating bore in 
the MLG trunion fitting for corrosion, install bushings and bearings 
without cadmium plating in the bore, and do all applicable 
corrective actions, in accordance with Configuration 1 of the 
Accomplishment Instructions of Boeing Service Bulletin MD90-57-016, 
Revision 2, dated April 28, 2006. Do all applicable corrective 
actions before further flight.

    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

[[Page 21530]]

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.''
    (h) Doing a general visual inspection, installing bushings and 
bearings, and doing all applicable corrective actions is also 
acceptable for compliance with the requirements of paragraph (g) of 
this AD if done before the effective date of this AD in accordance 
with the Accomplishment Instructions of Boeing Service Bulletin 
MD90-57-016, Revision 1, dated October 26, 2005.
    (i) Doing a general visual inspection, installing bushings and 
bearings, and doing all applicable corrective actions is also 
acceptable for compliance with the requirements of paragraph (g) of 
this AD if done before the effective date of this AD in accordance 
with the Accomplishment Instructions of Boeing Service Bulletin 
MD90-57-016, dated September 18, 2002, provided that before the 
accumulation of 30,000 total flight hours, or within 15,000 flight 
hours after the effective date of this AD, whichever occurs later, 
electroless nickel fittings are installed, and bushings and bearings 
without cadmium plating in the bore are installed in accordance with 
the Accomplishment Instructions of any of the service bulletins 
listed in Table 1 of this AD.


                                     Table 1--Acceptable Service Information
----------------------------------------------------------------------------------------------------------------
                   Document                        Revision                           Date
----------------------------------------------------------------------------------------------------------------
Boeing Service Bulletin MD90-57-016...........               0  September 18, 2002.
Boeing Service Bulletin MD90-57-016...........               1  October 26, 2005.
Boeing Service Bulletin MD90-57-016...........               2  April 28, 2006.
----------------------------------------------------------------------------------------------------------------

Alternative Methods of Compliance (AMOCs)

    (j)(1) The Manager, Los Angeles Aircraft Certification Office 
(ACO), 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: Roger Durbin, Aerospace Engineer, Airframe 
Branch, ANM-120L, FAA, Los Angeles Aircraft Certification Office, 
3960 Paramount Boulevard, Lakewood, California 90712-4137; telephone 
(562) 627-5233; fax (562) 627-5210.
    (2) To request a different method of compliance or a different 
compliance time for this AD, follow the procedures in 14 CFR 39.19. 
Before using any approved AMOC on any airplane to which the AMOC 
applies, notify your principal maintenance inspector (PMI) or 
principal avionics inspector (PAI), as appropriate, or lacking a 
principal inspector, your local Flight Standards District Office. 
The AMOC approval letter must specifically reference this AD.
    (3) An AMOC that provides an acceptable level of safety may be 
used for any repair required by this AD, if it is approved by Boeing 
Commercial Airplanes Organization Designation Authorization (ODA) 
who has been authorized by the Manager, Los Angeles ACO, to make 
those findings. For a repair method to be approved, the repair must 
meet the certification basis of the airplane and 14 CFR 25.571, 
Amendment 45, and the approval must specifically refer to this AD.

    Issued in Renton, Washington, on April 16, 2010.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 2010-9572 Filed 4-23-10; 8:45 am]
BILLING CODE 4910-13-P


