[Federal Register Volume 72, Number 129 (Friday, July 6, 2007)]
[Proposed Rules]
[Pages 36901-36905]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: E7-13115]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2007-28382; Directorate Identifier 2006-NM-179-AD]
RIN 2120-AA64


Airworthiness Directives; Boeing Model 727 Airplanes

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

ACTION: Notice of proposed rulemaking (NPRM).

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SUMMARY: The FAA proposes to adopt a new airworthiness directive (AD) 
for all Boeing Model 727 airplanes. This proposed AD would require 
revising the FAA-approved maintenance program by incorporating new 
airworthiness limitations (AWLs) for fuel tank systems to satisfy 
Special Federal Aviation Regulation No. 88 requirements. This proposed 
AD would also require the initial inspection of a certain repetitive 
AWL inspection to phase in that inspection, and repair if necessary. 
This proposed AD results from a design review of the fuel tank systems. 
We are proposing this AD to prevent the potential for ignition sources 
inside fuel tanks caused by latent failures, alterations, repairs, or 
maintenance actions, 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 August 20, 2007.

ADDRESSES: Use one of the following addresses to submit comments on 
this proposed AD.
     DOT Docket Web site: Go to http://dms.dot.gov and follow 
the instructions for sending your comments electronically.
     Government-wide rulemaking Web site: Go to http://www.regulations.gov and follow the instructions for sending your 
comments electronically.
     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.
     Fax: (202) 493-2251.
     Hand Delivery: Room W12-140 on the ground floor of the 
West Building, 1200 New Jersey Avenue, SE., Washington, DC, between 9 
a.m. and 5 p.m., Monday through Friday, except Federal holidays.
    Contact Boeing Commercial Airplanes, P.O. Box 3707, Seattle, 
Washington 98124-2207, for the service information identified in this 
proposed AD.

FOR FURTHER INFORMATION CONTACT: Kathrine Rask, Aerospace Engineer, 
Propulsion Branch, ANM-140S, FAA, Seattle Aircraft Certification 
Office, 1601 Lind Avenue, SW., Renton, Washington 98057-3356; telephone 
(425) 917-6505; fax (425) 917-6590.

SUPPLEMENTARY INFORMATION:

Comments Invited

    We invite you to submit any relevant written data, views, or 
arguments regarding this proposed AD. Send your comments to an address 
listed in the ADDRESSES section. Include the docket number ``FAA-2007-
28382; Directorate Identifier 2006-NM-179-AD'' at the beginning of your 
comments. We specifically invite comments on the overall regulatory, 
economic, environmental, and energy aspects of the proposed AD. We will 
consider all comments received by the closing date and may amend the 
proposed AD in light of those comments.
    We will post all comments we receive, without change, to http://dms.dot.gov, including any personal information you provide. We will 
also post a report summarizing each substantive verbal contact with FAA 
personnel concerning this proposed AD. Using the search function of 
that Web site, anyone can find and read the comments in any of our 
dockets,

[[Page 36902]]

including the name of the individual who sent the comment (or signed 
the comment on behalf of an association, business, labor union, etc.). 
You may review DOT's complete Privacy Act Statement in the Federal 
Register published on April 11, 2000 (65 FR 19477-78), or you may visit 
http://dms.dot.gov.

Examining the Docket

    You may examine the AD docket on the Internet at http://dms.dot.gov, or in person at the Docket Operations office between 9 
a.m. and 5 p.m., Monday through Friday, except Federal holidays. The 
Docket Operations office (telephone (800) 647-5527) is located on the 
ground floor of the West Building at the DOT street address stated in 
the ADDRESSES section. Comments will be available in the AD docket 
shortly after the Docket Management System receives them.

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'' 
(67 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 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 another 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 proposed AD 
are necessary to reduce the potential of ignition sources inside fuel 
tanks, 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 the following sections of Boeing 727-100/200 
Airworthiness Limitations (AWLs), D6-8766-AWL, original release, dated 
March 2006 (hereafter referred to as ``Document D6-8766-AWL''), for 
Model 727, 727C, 727-100, 727-100C, 727-200, and 727-200F series 
airplanes:
     Section A, ``SCOPE''
     Section B, ``FUEL SYSTEMS AIRWORTHINESS LIMITATIONS''
     Section C, ``SYSTEM AWL PAGE FORMAT''
     Section D, ``AIRWORTHINESS LIMITATIONS--FUEL SYSTEMS'' 
Those sections of Document D6-8766-AWL describe new AWLs for fuel tank 
systems. The new AWLs include:
     AWL inspections, which are periodic inspections of certain 
features for latent failures that could contribute to an ignition 
source; and
     Critical design configuration control limitations 
(CDCCLs), which are limitation requirements to preserve a critical 
ignition source prevention feature of the fuel tank system design that 
is necessary to prevent the occurrence of an unsafe condition. The 
purpose of a CDCCL is to provide instruction to retain the critical 
ignition source prevention feature during configuration change that may 
be caused by alterations, repairs, or maintenance actions. A CDCCL is 
not a periodic inspection.
    Accomplishing the actions specified in the service information is 
intended to adequately address the unsafe condition.

FAA's Determination and Requirements of the Proposed AD

    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 the FAA-approved maintenance program by 
incorporating the information in Sections A, B, C, and D of Document 
D6-8766-AWL. This proposed AD would also require the initial inspection 
of a certain repetitive AWL inspection to phase in that inspection, and 
repair if necessary.

Difference Between Proposed AD and Service Bulletin

    In most ADs, we adopt a compliance time allowing a specified amount 
of time after the AD's effective date. In this case, however, the FAA 
has already issued regulations that require operators to revise their 
maintenance/inspection programs to address fuel tank safety issues. The 
compliance date for these regulations is December 16, 2008. To provide 
for efficient and coordinated implementation of these regulations and 
this proposed AD, we are using this same compliance date in this 
proposed AD, instead of the 18-month compliance time recommended in the 
service bulletin.

Rework Required When Implementing AWLs Into an Existing Fleet

    The maintenance program revision for the fuel tank systems 
specified in paragraph (g) of this proposed AD, which involves 
incorporating the information specified in Document D6-8766-AWL, would 
affect how operators maintain their airplanes. After doing that 
maintenance program revision, operators would need to do any 
maintenance on the fuel tank system as specified in the CDCCLs. 
Maintenance done before the maintenance program revision specified in 
paragraph (g) would not need to be redone in order to comply with 
paragraph (g). For example, the AWL that requires fuel pumps to be 
repaired and overhauled per an FAA-approved component maintenance 
manual (CMM) applies to fuel pumps repaired after the maintenance 
programs are revised; spare or on-wing fuel pumps do not need to be 
reworked. For AWLs that require repetitive inspections, the initial 
inspection interval (threshold) starts from the date the maintenance 
program revision specified in paragraph (g) is done, except as provided 
by paragraph (h) of this proposed AD. This proposed AD would require 
only the maintenance

[[Page 36903]]

program revision specified in paragraph (g), and initial inspections 
specified in paragraph (h). No other fleet-wide inspections need to be 
done.

Changes to Fuel Tank System AWLs

    Paragraph (g) of this proposed AD would require revising the FAA-
approved maintenance program by incorporating certain information 
specified in Document D6-8766-AWL. Paragraph (g) allows accomplishing 
the maintenance program revision in accordance with later revisions of 
the Document D6-8766-AWL as an acceptable method of compliance if they 
are approved by the Manager, Seattle Aircraft Certification Office 
(ACO), FAA. Paragraph (h) allows accomplishing the initial inspection 
and repair in accordance with later revisions of Document D6-8766-AWL 
as an acceptable method of compliance if they are approved by the 
Manager, Seattle ACO. In addition, Section B of Document D6-8766-AWL 
specifies that any deviations from the published AWL instructions, 
including AWL intervals, must be approved by the Manager, Seattle ACO. 
Therefore, after the maintenance program revision, any further revision 
to an AWL or AWL interval should be done as an AWL change, not as an 
alternative method of compliance (AMOC). For U.S.-registered airplanes, 
operators must make requests through an appropriate FAA Principal 
Maintenance Inspector (PMI) or Principal Avionics Inspector (PAI) for 
approval by the Manager, Seattle ACO. A non-U.S. operator should 
coordinate changes with its governing regulatory agency.

Exceptional Short-Term Extensions

    Section B of Document D6-8766-AWL has provisions for an exceptional 
short-term extension of 30 days. An exceptional short-term extension is 
an increase in an AWL interval that may be needed to cover an 
uncontrollable or unexpected situation. For U.S.-registered airplanes, 
the FAA PMI or PAI must concur with any exceptional short-term 
extension before it is used, unless the operator has identified another 
appropriate procedure with the local regulatory authority. The FAA PMI 
or PAI may grant the exceptional short-term extensions described in 
Section B without consultation with the Manager, Seattle ACO. A non-
U.S. operator should coordinate changes with its governing regulatory 
agency. As explained in Document D6-8766-AWL, exceptional short-term 
extensions must not be used for fleet AWL extensions. An exceptional 
short-term extension should not be confused with an operator's short-
term escalation authorization approved in accordance with the 
Operations Specifications or the operator's reliability program.

Ensuring Compliance With Fuel Tank System AWLs

    Boeing has revised applicable maintenance manuals and task cards to 
address AWLs and to include notes about CDCCLs. Operators that do not 
use Boeing's revision service should revise their maintenance manuals 
and task cards to highlight actions tied to CDCCLs to ensure that 
maintenance personnel are complying with the CDCCLs. Appendix 1 of this 
proposed AD contains a list of Air Transport Association (ATA) sections 
for the revised maintenance manuals. Operators might wish to use the 
appendix as an aid to implement the AWLs.

Recording Compliance With Fuel Tank System AWLs

    The applicable operating rules of the Federal Aviation Regulations 
(14 CFR parts 91, 121, 125, and 129) require operators to maintain 
records with the identification of the current inspection status of an 
airplane. Some of the AWLs contained in Section D of Document D6-8766-
AWL are inspections for which the applicable sections of the operating 
rules apply. Other AWLs are CDCCLs, which are tied to conditional 
maintenance actions. An entry into an operator's existing maintenance 
record system for corrective action is sufficient for recording 
compliance with CDCCLs, as long as the applicable maintenance manual 
and task cards identify actions that are CDCCLs.

Changes to CMMs Cited in Fuel Tank System AWLs

    Some of the AWLs in Section D of Document D6-8766-AWL refer to 
specific revision levels of the CMMs as additional sources of service 
information for doing the AWLs. Boeing is referring to the CMMs by 
revision level in the applicable AWL for certain components rather than 
including information directly in Document D6-8766-AWL because of the 
volume of that information. As a result, the Manager, Seattle ACO, must 
approve the CMMs. Any later revision of those CMMs will be handled like 
a change to the AWL itself. Any use of parts (including the use of 
parts manufacturer approval (PMA) approved parts), methods, techniques, 
and practices not contained in the CMMs need to be approved by the 
Manager, Seattle ACO, or governing regulatory authority. For example, 
pump repair/overhaul manuals must be approved by the Manager, Seattle 
ACO.

Changes to AMMs Referenced in Fuel Tank System AWLs

    In other AWLs in Section D of Document D6-8766-AWL, the AWLs 
contain all the necessary data. The applicable section of the 
maintenance manual is usually included in the AWLs. Boeing intended 
this information to assist operators in maintaining the maintenance 
manuals. A maintenance manual change to these tasks may be made without 
approval by the Manager, Seattle ACO, through an appropriate FAA PMI or 
PAI, by the governing regulatory authority, or by using the operator's 
standard process for revising maintenance manuals. An acceptable change 
would have to maintain the information specified in the AWL such as the 
pass/fail criteria or special test equipment.

Costs of Compliance

    There are about 530 airplanes of the affected design in the 
worldwide fleet. The following table provides the estimated costs, at 
an average labor rate of $80 per hour, for U.S. operators to comply 
with this proposed AD.

                                                 Estimated Costs
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                                                                                         Number of
                                                                             Cost per      U.S.-
               Action                  Work hours           Parts            airplane    registered   Fleet cost
                                                                                         airplanes
----------------------------------------------------------------------------------------------------------------
Maintenance program revision........            8  None..................         $640          272     $174,080
Inspection..........................            8  None..................          640          272      174,080
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[[Page 36904]]

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 have 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 that the 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.
    We prepared a regulatory evaluation of the estimated costs to 
comply with this proposed AD and placed it in the AD docket. See the 
ADDRESSES section for a location to examine the regulatory evaluation.

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 Federal Aviation Administration (FAA) amends Sec.  39.13 by 
adding the following new airworthiness directive (AD):

Boeing: Docket No. FAA-2007-28382; Directorate Identifier 2006-NM-
179-AD.

Comments Due Date

    (a) The FAA must receive comments on this AD action by August 
20, 2007.

Affected ADs

    (b) None.

Applicability

    (c) This AD applies to all Boeing Model 727, 727C, 727-100, 727-
100C, 727-200, and 727-200F series airplanes, certificated in any 
category.

    Note 1: This AD requires revisions to certain operator 
maintenance documents to include new inspections and maintenance 
actions. Compliance with these limitations is required by 14 CFR 
43.16 and 91.403(c). For airplanes that have been previously 
modified, altered, or repaired in the areas addressed by these 
limitations, the operator may not be able to accomplish the actions 
described in the revisions. In this situation, to comply with 14 CFR 
43.16 and 91.403(c), the operator must request approval for revision 
to the airworthiness limitations in the Boeing 727-100/200 
Airworthiness Limitations (AWLs), D6-8766-AWL, according to 
paragraph (g) or (i) of this AD, as applicable.

Unsafe Condition

    (d) This AD results from a design review of the fuel tank 
systems. We are issuing this AD to prevent the potential for 
ignition sources inside fuel tanks caused by latent failures, 
alterations, repairs, or maintenance actions, which, in combination 
with flammable fuel vapors, could result in a fuel tank explosion 
and consequent loss of the airplane.

Compliance

    (e) You are responsible for having the actions required by this 
AD performed within the compliance times specified, unless the 
actions have already been done.

Service Information Reference

    (f) The term ``Document D6-8766-AWL'' as used in this AD, means 
Boeing 727-100/200 Airworthiness Limitations (AWLs), D6-8766-AWL, 
original release, dated March 2006.

Maintenance Program Revision

    (g) Before December 16, 2008, revise the FAA-approved 
maintenance program to incorporate the information in the sections 
specified in paragraphs (g)(1), (g)(2), (g)(3), and (g)(4) of this 
AD; except that the initial inspection required by paragraph (h) of 
this AD must be done at the applicable compliance time specified in 
that paragraph. Accomplishing the revision in accordance with a 
later revision of Document D6-8766-AWL is an acceptable method of 
compliance if the revision is approved by the Manager, Seattle 
Aircraft Certification Office (ACO), FAA.
    (1) Section A, ``SCOPE'' of Document D6-8766-AWL.
    (2) Section B, ``FUEL SYSTEMS AIRWORTHINESS LIMITATIONS,'' of 
Document D6-8766-AWL.
    (3) Section C, ``SYSTEM AWL PAGE FORMAT,'' of Document D6-8766-
AWL.
    (4) Section D, ``AIRWORTHINESS LIMITATIONS--FUEL SYSTEMS,'' of 
Document D6-8766-AWL.

Initial Inspection and Repair if Necessary

    (h) At the later of the compliance times specified in paragraphs 
(h)(1) and (h)(2) of this AD, do a detailed inspection of the wire 
bundles routed over the center fuel tank for damaged clamps, wire 
chafing, and wire bundles in contact with the surface of the center 
fuel tank, in accordance with AWL Number 28-AWL-01 of Section D of 
Document D6-8766-AWL. If any discrepancy is found during the 
inspection, repair the discrepancy before further flight in 
accordance with AWL Number 28-AWL-01 of Section D of Document D6-
8766-AWL. Accomplishing the actions required by this paragraph in 
accordance with a later revision of Document D6-8766-AWL is an 
acceptable method of compliance if the revision is approved by the 
Manager, Seattle ACO.

    Note 2: For the purposes of this AD, a detailed inspection is: 
``An intensive examination of a specific item, installation, or 
assembly to detect damage, failure, or irregularity. Available 
lighting is normally supplemented with a direct source of good 
lighting at an intensity deemed appropriate. Inspection aids such as 
mirror, magnifying lenses, etc., may be necessary. Surface cleaning 
and elaborate procedures may be required.''

    (1) Prior to the accumulation of 36,000 total flight hours, or 
within 120 months since the date of issuance of the original 
standard airworthiness certification or the date of issuance of the 
original export certificate of airworthiness, whichever ever occurs 
first.
    (2) Within 72 months after the effective date of this AD.

Alternative Methods of Compliance (AMOCs)

    (i)(1) The Manager, Seattle ACO, has the authority to approve 
AMOCs for this AD, if requested in accordance with 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.

[[Page 36905]]



Appendix 1.--Implementing Fuel Tank System Airworthiness Limitations on Model 727, 727C, 727-100, 727-100C, 727-
                                         200, 727-200F Series Airplanes
----------------------------------------------------------------------------------------------------------------
                                                               ATA section or CMM
              AWL No.                     ALI/CDCCL                 document                   Task title
----------------------------------------------------------------------------------------------------------------
28-AWL-01.........................  ALI..................  AMM 28-11-00/601..........  External Wires Over the
                                                                                        Tank No. 2 Inspection.
28-AWL-02.........................  CDCCL................  SWPM 20-10-11.............  Wiring Assembly and
                                                                                        Installation
                                                                                        Configuration.
28-AWL-03.........................  CDCCL................  SWPM 20-10-11.............  Wiring Assembly and
                                                                                        Installation
                                                                                        Configuration.
28-AWL-04.........................  CDCCL................  CMM 28-41-01, Revision 12;
                                                            CMM 28-41-02, Revision 5;
                                                            CMM 28-41-03, Revision 3;
                                                            CMM 28-41-06, Revision 8;
                                                            CMM 28-41-07, Revision
                                                            17; CMM 28-41-08,
                                                            Revision 9; CMM 28-41-09,
                                                            Revision 8; CMM 28-41-23,
                                                            Revision 10; or
                                                            subsequent revisions.
28-AWL-05.........................  CDCCL................  CMM 28-40-03, Revision 5;
                                                            CMM 28-41-06, Revision 8;
                                                            or subsequent revisions.
28-AWL-06.........................  CDCCL................  SWPM 20-14-12.............  Repair of Fuel Quantity
                                                                                        Indicator System (FQIS)
                                                                                        Wire Harness.
                                                           AMM 28-41-21/401            Remove/Install Fuel Tank
                                                                                        Bulkhead (Spar)
                                                                                        Receptacle Wire Harness.
28-AWL-07.........................  CDCCL................  AMM 29-11-53/401..........  Install System A
                                                                                        Hydraulic Fluid Heat
                                                                                        Exchanger.
                                                           AMM 29-12-61/401            Install System B
                                                                                        Hydraulic Fluid Heat
                                                                                        Exchanger.
28-AWL-08.........................  CDCCL................
28-AWL-09.........................  CDCCL................  CMM 28-20-1, Revision 7;
                                                            CMM 28-20-5, Revision 6;
                                                            CMM 28-20-06, Revision 6;
                                                            or subsequent revisions.
28-AWL-10.........................  CDCCL................  AMM 28-22-21/401..........  Install Fuel Boost Pump.
28-AWL-11.........................  CDCCL................  AMM 28-21-93/401..........  Remove the Auxiliary Tank
                                                                                        Fueling Float Switch.
                                                           AMM 28-21-93/401            Install the Auxiliary
                                                                                        Tank Fueling Float
                                                                                        Switch.
28-AWL-12.........................  CDCCL................  AMM 28-11-21/401..........  Removal/Installation Cast
                                                                                        Fuel Tank Access Panels.
28-AWL-13.........................  CDCCL................  AMM 28-11-21/401..........  Removal/Installation
                                                                                        Machined Fuel Tank
                                                                                        Access Panels.
                                                           AMM 28-13-11/401            Install the Relief Valve.
28-AWL-14.........................  CDCCL................  AMM 28-22-21/601..........  Fuel Boost Pump--
                                                                                        Inspection/Check.
28-AWL-15.........................  CDCCL................  AMM 28-22-00/101..........  Engine Fuel Feed System--
                                                                                        Trouble Shooting.
----------------------------------------------------------------------------------------------------------------


    Issued in Renton, Washington, on June 22, 2007.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
 [FR Doc. E7-13115 Filed 7-5-07; 8:45 am]
BILLING CODE 4910-13-P