[Federal Register Volume 74, Number 200 (Monday, October 19, 2009)]
[Proposed Rules]
[Pages 53436-53438]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: E9-24987]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2009-0908; Directorate Identifier 2009-NM-067-AD]
RIN 2120-AA64
Airworthiness Directives; Boeing Model 757 Airplanes
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Notice of proposed rulemaking (NPRM).
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SUMMARY: We propose to adopt a new airworthiness directive (AD) for
certain Boeing Model 757 airplanes. This proposed AD would require
replacing the power control relays for the fuel boost pumps and
override pumps with new relays having a ground fault interrupt (GFI)
feature. This proposed AD results from fuel system reviews conducted by
the manufacturer. We are proposing this AD to prevent damage to the
fuel pumps caused by electrical arcing that could introduce an ignition
source in the fuel tank, which, in combination with flammable fuel
vapors, could result in a fuel tank explosion and consequent loss of
the airplane.
DATES: We must receive comments on this proposed AD by December 3,
2009.
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,
P.O. Box 3707, MC 2H-65, Seattle, Washington 98124-2207; telephone 206-
544-5000, extension 1; fax 206-766-5680; e-mail [email protected];
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 or
425-227-1152.
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: Georgios Roussos, Aerospace Engineer,
Systems and Equipment Branch, ANM-130S, FAA, Seattle Aircraft
Certification Office, 1601 Lind Avenue SW., Renton, Washington 98057-
3356; telephone (425) 917-6482; fax (425) 917-6590.
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-2009-0908;
Directorate Identifier 2009-NM-067-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
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''
(66 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
[[Page 53437]]
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.
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.
As part of the SFAR 88 required review, Boeing determined that the
power control relays for the fuel boost pumps and override pumps should
be replaced with new relays having a ground fault interrupt (GFI)
feature. The relays are located in the P33 and P37 equipment panels in
the main equipment center. The GFI feature is intended to protect the
fuel pumps from damage caused by electrical arcing by removing
electrical power from the pump if a ground fault is detected.
Electrical arcing, if not prevented, could introduce an ignition source
in the fuel tank, which, in combination with flammable fuel vapors,
could result in a fuel tank explosion and consequent loss of the
airplane.
Relevant Service Information
We have reviewed Boeing Alert Service Bulletin 757-28A0078, dated
July 16, 2008 (for Boeing Model 757-200, 757-200CB, and 757-200PF
series airplanes); and Boeing Alert Service Bulletin 757-28A0079, dated
July 16, 2008 (for Boeing Model 757-300 series airplanes). These
service bulletins describe procedures for replacing the power control
relays for the fuel boost pumps and override pumps with new relays
having a ground fault interrupt (GFI) feature. The replacement also
includes an operational test of the fuel boost pumps, override pumps,
and new relays.
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 the same type design.
This proposed AD would require accomplishing the actions specified in
the service information described previously.
Airworthiness Limitation (AWL) 28-AWL-21, of Section 9 of the
Boeing 757 Maintenance Planning Document (MPD) Document, D622N001-9,
Revision March 2008, which was required by AD 2008-10-11, is also
related to this proposed AD by including a repetitive operational test
of the GFI relays, and repair of any failed GFI relay to ensure
continued functionality of the GFI circuit.
Costs of Compliance
We estimate that this proposed AD would affect 696 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
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Number of U.S.-
Action Work hours Average labor Parts Cost per registered Fleet cost
rate per hour product airplanes
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Replacement....................................... 7 $80 $12,600 $13,160 696 $9,159,360
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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:
Boeing: Docket No. FAA-2009-0908; Directorate Identifier 2009-
NM-067-AD.
Comments Due Date
(a) We must receive comments by December 3, 2009.
[[Page 53438]]
Affected ADs
(b) None.
Applicability
(c) This AD applies to Boeing Model 757-200, -200PF, -200CB, and
-300 series airplanes, certificated in any category; as identified
in the applicable service bulletin in paragraphs (c)(1) or (c)(2) of
this AD.
(1) For Model 757-200, -200PF, and -200CB series airplanes:
Boeing Alert Service Bulletin 757-28A0078, dated July 16, 2008.
(2) For Model 757-300 series airplanes: Boeing Alert Service
Bulletin 757-28A0079, dated July 16, 2008.
Subject
(d) Air Transport Association (ATA) of America Code 28: Fuel.
Unsafe Condition
(e) This AD results from fuel system reviews conducted by the
manufacturer. The Federal Aviation Administration is issuing this AD
to prevent damage to the fuel pumps caused by electrical arcing that
could introduce an ignition source in the fuel tank, which, in
combination with flammable fuel vapors, could result in a fuel tank
explosion and consequent loss of the airplane.
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.
Replacement
(g) Within 60 months after the effective date of this AD:
Replace the power control relays for the fuel boost pumps and
override pumps with new relays having a ground fault interrupt (GFI)
feature, and do an operational test, in accordance with the
Accomplishment Instructions of Boeing Alert Service Bulletin 757-
28A0078, dated July 16, 2008 (for Model 757-200, -200CB, and -200PF
airplanes); or Boeing Alert Service Bulletin 757-28A0079, dated July
16, 2008 (for Model 757-300 airplanes).
Alternative Methods of Compliance (AMOCs)
(h)(1) The Manager, Seattle 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: Georgios Roussos, Aerospace Engineer, Systems and Equipment
Branch, ANM-130S, FAA, Seattle ACO, 1601 Lind Avenue, SW., Renton,
Washington 98057-3356; telephone (425) 917-6482; fax (425) 917-6590.
Or, e-mail information to [email protected].
(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.
Issued in Renton, Washington, on September 30, 2009.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. E9-24987 Filed 10-16-09; 8:45 am]
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