[Federal Register Volume 78, Number 177 (Thursday, September 12, 2013)]
[Proposed Rules]
[Pages 56182-56183]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2013-22187]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2012-0859; Directorate Identifier 2012-NM-090-AD]
RIN 2120-AA64


Airworthiness Directives; The Boeing Company Airplanes

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

ACTION: Proposed rule; withdrawal.

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SUMMARY: The FAA withdraws a notice of proposed rulemaking (NPRM) that 
proposed to rescind airworthiness directive (AD) 2008-06-03, which 
applies to certain The Boeing Company Model 737-600, -700, -700C, -800 
and -900 series airplanes; and Model 757-200, -200PF, -200CB, and -300 
series airplanes. The NPRM would have rescinded AD 2008-06-03, which 
requires an inspection to determine if certain motor-operated shutoff 
valve actuators for the fuel tanks are installed, and related 
investigative and corrective actions if necessary. AD 2008-06-03 also 
requires revising the Airworthiness Limitations (AWLs) section of the 
Instructions for Continued Airworthiness to incorporate certain AWLs. 
Since the NPRM was issued, we have determined that it does not 
adequately address the safety concerns. Accordingly, the NPRM is 
withdrawn.

DATES: As of September 12, 2013, the proposed rule, which was published 
on August 27, 2012 (77 FR 51722), is withdrawn.

ADDRESSES: 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 AD action, the proposed rule (77 
FR 51722, August 27, 2012), the regulatory evaluation, any comments 
received, and other information. The address for the Docket Office 
(phone: 800-647-5527) is the Document Management Facility, U.S. 
Department of Transportation, Docket Operations, M-30, West Building 
Ground Floor, Room W12-140, 1200 New Jersey Avenue SE., Washington, DC 
20590.

FOR FURTHER INFORMATION CONTACT: Rebel Nichols, Aerospace Engineer, 
Propulsion Branch, ANM-140S, FAA, Seattle Aircraft Certification 
Office, 1601 Lind Avenue SW., Renton, WA 98057-3356; phone: (425) 917-
6509; fax: (425) 917-6590; email: [email protected].

SUPPLEMENTARY INFORMATION: 

Discussion

    We proposed to amend 14 CFR part 39 with a notice of proposed 
rulemaking (NPRM) to rescind AD 2008-06-03, Amendment 39-15415 (73 FR 
13081, March 12, 2008). AD 2008-06-03 applies to the specified 
products. The NPRM published in the Federal Register on August 27, 2012 
(77 FR 51722). The NPRM proposed to rescind AD 2008-06-03, which 
requires an inspection to determine if certain motor-operated shutoff 
valve actuators for the fuel tanks are installed, and related 
investigative and corrective actions if necessary. AD 2008-06-03 also 
requires revising the AWLs section of the Instructions for Continued

[[Page 56183]]

Airworthiness to incorporate AWL No. 28-AWL-21, No. 28-AWL-22, and No. 
28-AWL-24 (for Model 737-600, -700, -700C, -800, and -900 series 
airplanes); and No. 28-AWL-23, No. 28-AWL-24, and No. 28-AWL-25 (for 
Model 757-200, -200PF, -200CB, and -300 series airplanes). AD 2008-06-
03 resulted from fuel system reviews conducted by the manufacturer. The 
proposed actions were intended to prevent an unsafe condition from 
being introduced on airplanes affected by AD 2008-06-03.

Comments

    We gave the public the opportunity to participate in considering 
the proposal (77 FR 51722, August 27, 2012) to rescind AD 2008-03-03, 
Amendment 39-15415 (73 FR 13081, March 12, 2008). The following 
presents relevant comments received on the proposal and the FAA's 
response to those comments.

Requests To Clarify ``Different Unsafe Condition''

    FedEx, American Airlines, and Boeing requested clarification of the 
different unsafe condition introduced by the actions required by AD 
2008-06-03, Amendment 39-15415 (73 FR 13081, March 12, 2008). Boeing 
also stated that the NPRM (77 FR 51722, August 27, 2012) does not 
indicate if the different unsafe condition is applicable to all 
actuator locations required by AD 2008-06-03.
    We agree that clarification of the different unsafe condition is 
necessary. AD 2008-06-03, Amendment 39-15415 (73 FR 13081, March 12, 
2008), addresses the potential for an electrical current to flow 
through certain motor-operated shutoff valve actuators into the fuel 
tank. The new motor-operator valve (MOV) actuators are required by AD 
2008-06-03 for three locations on Model 737 airplanes and six or seven 
locations on Model 757 airplanes (depending on configuration); and that 
AD addresses an unsafe condition related to Special Federal Aviation 
Regulation No. 88 (``SFAR 88'' (66 FR 23086, May 7, 2001), Amendment 
21-78, and subsequent Amendments 21-82 and 21-83).
    However, the new motor-operated shutoff valve actuators have been 
found to have a risk of latent failure. At two of the locations on 
Model 737 airplanes and at three locations on Model 757 airplanes, this 
actuator failure could result in a different unsafe condition--i.e., an 
inability to shut off fuel flow to an auxiliary power unit (APU) (on 
Model 757 airplanes only) or engine during an engine fire. This latent 
failure is not a safety risk in the other three to four locations.
    We have determined that AD 2008-06-03, Amendment 39-15415 (73 FR 
13081, March 12, 2008), should not be rescinded, but should continue to 
require actions that address SFAR 88-related safety. Because AD 2008-
06-03 does address a significant safety risk, it is not in the interest 
of safety to rescind that AD. For the new MOV actuators, we are 
considering further rulemaking to address the certain locations where a 
latent failure of the actuator could result in a failure to shut off 
fuel flow during an engine fire.

Request To Extend Compliance Time

    Allegiant Air supported the proposed rescission (77 FR 62833, 
August 27, 2012) and requested that, if the FAA decided not to adopt 
the rescission, the FAA provide an extension of the compliance time 
required by AD 2008-06-03, Amendment 39-15415 (73 FR 13081, March 12, 
2008), by using a ``global'' alternative method of compliance (AMOC). 
Allegiant Air stated that the proposed rescission has brought 
uncertainty to operators of the affected Model 737 and 757 airplanes. 
We infer the subject of the uncertainty involves an operator still 
needing to schedule time to do the required actions prior to the 
compliance time required in AD 2008-06-03.
    We disagree. We have not received any AMOC requests to extend the 
compliance time. We also have not received justification to extend an 
AMOC to all the airplanes affected by AD 2008-06-03, Amendment 39-15415 
(73 FR 13081, March 12, 2008). However, under the provisions of 
paragraph (i) of AD 2008-06-03, we will consider individual operator 
requests for approval of an extension of the compliance time if 
sufficient data are submitted to substantiate that the new compliance 
time would provide an acceptable level of safety. We have determined 
that no change to AD 2008-06-03 is necessary.

FAA's Conclusions

    Upon further consideration, we have determined that the NPRM (77 FR 
51722, August 27, 2012) does not adequately address the safety concern. 
Accordingly, the NPRM is withdrawn.
    Withdrawal of the NPRM (77 FR 51722, August 27, 2012) does not 
preclude the FAA from issuing another related action nor commit the FAA 
to any course of action in the future.

Regulatory Impact

    Since this action only withdraws an NPRM (77 FR 51722, August 27, 
2012), it is neither a proposed nor a final rule and therefore is not 
covered under Executive Order 12866, the Regulatory Flexibility Act, or 
DOT Regulatory Policies and Procedures (44 FR 11034, February 26, 
1979).

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Incorporation by 
reference, Safety.

The Withdrawal
    Accordingly, we withdraw the NPRM, Docket No. FAA-2012-0859, 
Directorate Identifier 2012-NM-090-AD, which was published in the 
Federal Register on August 27, 2012 (77 FR 51722).


    Issued in Renton, Washington, on September 5, 2013.
Jeffrey E. Duven,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 2013-22187 Filed 9-11-13; 8:45 am]
BILLING CODE 4910-13-P