Document ID: FAA-2008-0645-0001
Agency: faa
Document Type: Rule
Title: Airworthiness Directives; Boeing Model 707 Airplanes and Model 720 and 720B Series Airplanes
Posted Date: 2008-06-20T04:00Z

[Federal Register: June 20, 2008 (Volume 73, Number 120)]
[Proposed Rules]               
[Page 35092-35093]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr20jn08-15]                         

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2008-0645; Directorate Identifier 2007-NM-358-AD]
RIN 2120-AA64

 
Airworthiness Directives; Boeing Model 707 Airplanes and Model 
720 and 720B Series 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 all 
Boeing Model 707 airplanes and Model 720 and 720B series airplanes. 
This proposed AD would require performing an operational test of the 
engine fuel suction feed of the fuel system, and other related testing 
if necessary. This proposed AD results from a report of in-service 
occurrences of loss of fuel system suction feed capability, followed by 
total loss of pressure of the fuel feed system. We are proposing this 
AD to detect and correct failure of the engine fuel suction feed of the 
fuel system, which could result in multi-engine flameout, inability to 
restart the engines, and consequent forced landing of the airplane.

DATES: We must receive comments on this proposed AD by August 4, 2008.

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 AD, contact Boeing 
Commercial Airplanes, P.O. Box 3707, Seattle, Washington 98124-2207.

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: Sue Lucier, Aerospace Engineer, 
Propulsion Branch, ANM-140S, FAA, Seattle Aircraft Certification 
Office, 1601 Lind Avenue SW., Renton, Washington 98057-3356; telephone 
(425) 917-6438; 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-2008-0645; 
Directorate Identifier 2007-NM-358-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 a report of in-service occurrences of loss of fuel 
system suction feed capability, followed by total loss of pressure of 
the fuel feed system. This report prompted us to review the service 
history of all Boeing airplane models, and we found instances of loose 
and leaking fuel line fittings. This condition, if not corrected, could 
result in multi-engine flameout, inability to restart the engines, and 
consequent forced landing of the airplane.

Explanation of Relevant Service Information

    We have reviewed Boeing Alert Service Bulletin A3527, dated 
November 7, 2007. The service bulletin describes procedures for 
performing an operational test of the engine fuel suction feed of the 
fuel system, and other related testing if necessary. The other related 
testing includes doing a vacuum test on the applicable engine for 
leakage if an engine's N1, N2, or fuel-

[[Page 35093]]

flow parameters deteriorate during the test. If any leakage is found in 
the couplings, the o-rings should be replaced; if any leakage is found 
in the fuel line, the fuel line should be replaced.

FAA's Determination and Requirements of This Proposed AD

    We are proposing this AD because we have evaluated all pertinent 
information and identified an unsafe condition that is likely to exist 
or develop on other airplanes of this same type design. For this 
reason, we are proposing this AD, which would require accomplishing the 
actions specified in the service information described previously.

Costs of Compliance

    We estimate that this proposed AD would affect 21 airplanes of U.S. 
registry. We also estimate that it would take 1 work-hour per product, 
per test, to comply with this proposed AD. The average labor rate is 
$80 per work-hour. Based on these figures, we estimate the cost of this 
proposed AD to the U.S. operators to be $1,680, or $80 per product, per 
test.

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, 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-2008-0645; Directorate Identifier 2007-NM-
358-AD.

Comments Due Date

    (a) We must receive comments by August 4, 2008.

Affected ADs

    (b) None.

Applicability

    (c) This AD applies to all Boeing Model 707-100 long body, -200, 
-100B long body, and -100B short body series airplanes; and Model 
707-300, -300B, -300C, and -400 series airplanes; and Model 720 and 
720B series airplanes; certificated in any category.

Unsafe Condition

    (d) This AD results from a report of in-service occurrences of 
loss of fuel system suction feed capability, followed by total loss 
of pressure of the fuel feed system. We are issuing this AD to 
detect and correct failure of the engine fuel suction feed of the 
fuel system, which could result in multi-engine flameout, inability 
to restart the engines, and consequent forced landing of the 
airplane.

Compliance

    (e) Comply with this AD within the compliance times specified, 
unless already done.

Operational Test/Other Specified Actions

    (f) Within 18 months after the effective date of this AD, 
perform an operational test of the engine fuel suction feed of the 
fuel system, and perform all other related testing, as applicable, 
before further flight, in accordance with the Accomplishment 
Instructions of Boeing Alert Service Bulletin A3527, dated November 
7, 2007. Repeat the operational test thereafter at intervals not to 
exceed 6,000 flight hours.

Alternative Methods of Compliance (AMOCs)

    (g)(1) The Manager, Seattle ACO, FAA, ATTN: Sue Lucier, 
Aerospace Engineer, Propulsion Branch, ANM-140S, FAA, Seattle ACO, 
1601 Lind Avenue SW., Renton, Washington 98057-3356; telephone (425) 
917-6438; fax (425) 917-6590, has the authority to approve AMOCs for 
this AD, if requested using the procedures found in 14 CFR 39.19.
    (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 appropriate principal inspector (PI) in the FAA 
Flight Standards District Office (FSDO), or lacking a PI, your local 
FSDO.

    Issued in Renton, Washington on June 9, 2008.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
 [FR Doc. E8-13925 Filed 6-19-08; 8:45 am]

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