
[Federal Register: December 10, 2008 (Volume 73, Number 238)]
[Proposed Rules]               
[Page 75007-75009]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr10de08-17]                         

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

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SUMMARY: We are revising an earlier proposed airworthiness directive 
(AD) for all Boeing Model 707 airplanes and Model 720 and 720B series 
airplanes. The original NPRM would have required performing an 
operational test of the engine fuel suction feed of the fuel system, 
and other related testing if necessary. The original NPRM resulted 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. 
This action revises the original NPRM by reducing the compliance time 
for low-utilization airplanes, and including corrective actions that 
were inadvertently omitted from certain sections. The corrective 
actions are replacing the o-rings if any leakage is found in the 
couplings, and replacing the fuel line if any leakage is found in the 
fuel line. We are proposing this supplemental NPRM to detect and 
correct failure of the engine fuel suction feed capability 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 supplemental NPRM by January 5, 
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 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 me.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 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: 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 issued a notice of proposed rulemaking (NPRM) (the ``original 
NPRM'') to amend 14 CFR part 39 to include an airworthiness directive 
(AD) that would apply to all Boeing Model 707 airplanes and Model 720 
and 720B series airplanes. That original NPRM was published in the 
Federal Register on June 20, 2008 (73 FR 35092). That original NPRM 
proposed to require performing an operational test of the engine fuel 
suction feed of the fuel system, and other related testing if 
necessary.

Actions Since Original NPRM was Issued

    Since we issued the original NPRM, we have learned that corrective 
actions were inadvertently omitted from the Summary section and 
paragraph (f) of the original NPRM. The corrective actions were 
identified in the relevant service information section of the original 
NPRM and include replacing the o-rings if any leakage is found in the 
couplings, and replacing the fuel line if any leakage is found in the 
fuel line.

Comments

    We gave the public the opportunity to participate in developing 
this AD. We considered the comments received from a single commenter.

[[Page 75008]]

Request To Change Repetitive Test Interval for Low-Utilization 
Airplanes

    Boeing asks that we add a maximum time interval of 3 years to the 
current 6,000-flight-hour repetitive test interval specified in 
paragraph (f) of the original NPRM. Boeing states that low-utilization 
airplanes may not meet the 6,000-flight-hour threshold for several 
years.
    We agree to change the repetitive test interval. The data provided 
by the manufacturer justify a change to the repetitive test interval 
currently specified in the original NPRM to acknowledge that elapsed 
calendar time, as well as operational time, can affect suction feed 
capability. We have determined that changing the intervals in terms of 
calendar and operational time, as recommended by the manufacturer, will 
ensure an adequate level of safety for the affected fleet. We have 
changed the compliance time for the repetitive operational tests 
specified in paragraph (f) of this supplemental NPRM as requested.

Request To Clarify Reason for the Unsafe Condition

    Boeing asks that we clarify the description of in-service 
occurrences of loss of fuel system suction feed capability specified in 
the original NPRM, which states that the proposed AD results from 
reports of two in-service engine flameout events operating on suction 
feed with undetected air leak failures. Boeing notes that there are no 
known reports of any engine flameout-related events in the Model 707 
airplane fleet. Boeing recognizes that undetected air leaks could 
exist, and the maintenance procedure is a proactive measure to ensure 
engine flameout will not occur due to air leaks while on suction feed 
operation. Boeing is unclear as to the incidents in question and only 
through further investigation discovered that the engine suction feed 
incidents did not occur within the Model 707 airplane fleet. Boeing 
asks that we clarify the Summary, Discussion, and Unsafe Condition 
sections, and ``FAA's Determination and Requirements of this Proposed 
AD.''
    We agree that the Summary and Discussion sections and ``FAA's 
Determination and Requirements of this Proposed AD'' could be clarified 
in the supplemental NPRM as Boeing requests. The inaccurate language 
which was contained in the original NPRM is not restated in the 
supplemental NPRM. Therefore, no change to the supplemental NPRM is 
necessary in this regard.

Request To Clarify the Requirement for Additional Testing

    Boeing asks that we clarify the requirement for additional testing 
of the engine fuel feed manifold specified in the Summary section. 
Boeing states that this requirement would be better described as 
performing corrective action in case the engine suction feed 
operational test is not successful. Boeing asks that we change the 
second sentence in the Summary section as follows: ``This proposed AD 
would require performing an operational test of the engine fuel suction 
feed of the fuel system. If necessary, corrective actions may be 
required, before further flight.''
    We agree with the request to clarify the requirement for additional 
testing of the engine fuel feed manifold. As specified under ``Actions 
Since Original NPRM was Issued,'' we have added the corrective action 
language that was not included in the original NPRM to this 
supplemental NPRM.

Request To Allow Later Revisions of the Referenced Service Bulletin

    Boeing asks that we revise the original NPRM to allow further 
revisions to the Boeing Alert Service Bulletin A3527, dated November 7, 
2007 (referenced in the original NPRM as the source of service 
information for accomplishing the specified actions). Boeing states 
that the service bulletin may be revised over time which would require 
frequent requests for alternative methods of compliance (AMOC).
    We do not agree with the request. This supplemental NPRM must be 
consistent with FAA policy and Office of the Federal Register 
regulations, which do not allow references to the use of ``later 
revisions'' of the applicable service information in ADs. Therefore, no 
change to the supplemental NPRM is necessary in this regard.

FAA's Determination and Proposed Requirements of the Supplemental NPRM

    We are proposing this supplemental NPRM 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 original 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 supplemental NPRM.

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, Incorporation by 
reference, Safety.

The Proposed Amendment

    Accordingly, under the authority delegated to me by the 
Administrator,

[[Page 75009]]

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 January 5, 2009.

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 and Corrective 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 and corrective 
actions, 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 or 36 
months, whichever occurs first.

Alternative Methods of Compliance (AMOCs)

    (g)(1) The Manager, Seattle Aircraft Certification Office (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 November 28, 2008.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
 [FR Doc. E8-29257 Filed 12-9-08; 8:45 am]

BILLING CODE 4910-13-P
