[Federal Register Volume 76, Number 68 (Friday, April 8, 2011)]
[Proposed Rules]
[Pages 19710-19714]
[FR Doc No: 2011-8407]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2011-0304; Directorate Identifier 2010-NM-103-AD]
RIN 2120-AA64

Airworthiness Directives; The Boeing Company Model 757 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 supersede an existing airworthiness
directive (AD) that applies to all Model 757 airplanes. The existing AD
currently requires revising the Airworthiness Limitations (AWLs)
section of the Instructions for Continued Airworthiness by
incorporating new limitations for fuel tank systems to satisfy Special
Federal Aviation Regulation No. 88 requirements. That AD also requires
the initial inspection of certain repetitive AWL inspections to phase-
in those inspections, and repair if necessary. This proposed AD would
require actions that were provided previously as optional actions, and
would require a certain initial inspection to be accomplished for a
revised AWL. This proposed AD results from a report that an AWL
required by the existing AD must be revised. 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 May 23, 2011.

ADDRESSES: You may send comments by any of the following methods:
     Federal eRulemaking Portal: Go to
http:[sol][sol]www.regulations.gov. Follow the instructions for
submitting comments.
     Fax:<PHONE_NUMBER>.
     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<PHONE_NUMBER>; e-mail<EMAIL_ADDRESS>
Internet https:[sol][sol]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<PHONE_NUMBER>.

Examining the AD Docket

    You may examine the AD docket on the Internet at
http:[sol][sol]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<PHONE_NUMBER>) is in
the ADDRESSES section. Comments will be available in the AD docket
shortly after receipt.

FOR FURTHER INFORMATION CONTACT: Tak Kobayashi, Aerospace Engineer,
Propulsion Branch, ANM-140S, FAA, Seattle Aircraft Certification
Office, 1601 Lind Avenue, SW., Renton, Washington 98057-3356; phone:
425-917-6499; fax:<PHONE_NUMBER>; e-mail<EMAIL_ADDRESS>
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-2011-0304;
Directorate Identifier 2010-NM-103-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:[sol][sol]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

    On April 29, 2008, we issued AD 2008-10-11, amendment 39-15517 (73
FR 25974, May 8, 2008), for all Model 757 series airplanes. That AD
requires revising the Airworthiness Limitations (AWLs) section of the
Instructions for Continued Airworthiness by incorporating new
limitations for fuel tank systems to satisfy Special Federal Aviation
Regulation No. 88 requirements. That AD also requires the initial
inspection of certain repetitive AWL inspections to phase-in those
inspections, and repair if necessary. That AD resulted from a design
review of the fuel tank systems. We issued that 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.

Actions Since Existing AD Was Issued

    Since we issued AD 2008-10-11, we received a report from the
manufacturer that AWL No. 28-AWL-03, as specified in Boeing Temporary
Revision (TR) 09-008, dated March 2008, contained incorrect
information. Boeing TR 09-008 was published as Section 9 of the Boeing
757 Maintenance Planning Data (MPD) Document, D622N001-9, Revision
March 2008, and was referenced by AD 2008-10-11. Use of that AWL may
result in not detecting defects in the fuel quantity indicating system
(FQIS) wiring shield. Boeing issued Boeing TR 09-010, dated July 2010,
which was published as Section 9 of the Boeing 757 MPD Document,
D622N001-9, Revision July 2010. That document also revises other AWLs
referenced by AD 2008-10-11.
    Since we issued that AD, we have also determined that it is
necessary to clarify the AD's intended effect on spare and on-airplane
fuel tank system components, regarding the use of maintenance manuals
and instructions for continued airworthiness.
    Section 91.403(c) of the Federal Aviation Regulations (14 CFR
91.403(c)) specifies the following:

    No person may operate an aircraft for which a manufacturer's
maintenance manual or instructions for continued airworthiness has
been issued that contains an airworthiness limitation section unless
the mandatory * * * procedures * * * have been complied with.

Critical design configuration control limitations (CDCCLs) are
airworthiness 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 changes that may be
caused by alterations, repairs, or maintenance actions. A CDCCL is not
a periodic inspection.
    Some operators have questioned whether existing components affected
by the new CDCCLs must be reworked. We did not intend for the AD to
retroactively require rework of components that had been maintained
using acceptable methods before the effective date of the AD. Owners
and operators of the affected airplanes therefore are not required to
rework affected components identified as airworthy or installed on the
affected airplanes before the required revisions of the maintenance
program. But once the CDCCLs are incorporated into the maintenance
program, future maintenance actions on components must be done in
accordance with those CDCCLs.

Explanation of Changes to AD 2008-10-11

    AD 2008-10-11 allowed the inclusion of AWLs No. 28-AWL-25 and 28-
AWL-26 as an optional action. We have determined that those AWLs must
be required. We have added that requirement in paragraph (l) of this
proposed AD to require those AWLs and paragraphs (n) and (o) of this
proposed AD to clarify the required compliance times for those AWLs.
    We have removed the ``Service Information'' reference paragraph
from this proposed AD. That paragraph was identified as paragraph (f)
in AD 2008-10-11. Instead, we have provided the full service
information citations throughout this NPRM.
    AD 2008-10-11 allowed the use of alternative inspections,
intervals, or CDCCLs if they are part of a later revision of Boeing TR
09-008, dated

March 2008, to Section 9 of the Boeing 757 MPD Document, D622N001-9. AD
2008-10-11 also allowed the use of later revisions of Section 9 of the
Boeing 757 MPD Document, D622N001-9. Those provisions have been removed
from this proposed AD. We have removed the references to ``a later
revision'' or ``later FAA-approved revisions'' of specific service
documents to be consistent with FAA policy and with Office of the
Federal Register regulations for approving materials that are
incorporated by reference. Affected operators, however, may request
approval to use a later revision or an alternative CDCCL, inspection,
or interval that is part of a later revision of the referenced service
documents as an alternative method of compliance, under the provisions
of paragraph (u) of this AD.

FAA's Determination and Requirements of the Proposed AD

    We have evaluated all pertinent information and identified an
unsafe condition that is likely to develop on other airplanes of the
same type design. For this reason, we are proposing this AD, which
would supersede AD 2008-10-11 and would retain the requirements of the
existing AD with revised service information. This proposed AD would
also require actions that were previously provided as optional actions
in the existing AD.

Costs of Compliance

    There are about 990 airplanes of the affected design in the
worldwide fleet. The following table provides the estimated costs for
U.S. operators to comply with this proposed AD.

                                                                     Estimated Costs
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                                                                                Number of U.S.-
                       Action                             Work hours      Average labor rate   Cost per airplane      registered          Fleet cost
                                                                               per hour                                airplanes
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AWLs revision (required by AD 2008-10-11)...........                   8                 $85                $680                 639            $434,520
Inspections (required by AD 2008-10-11).............                   8                  85                 680                 639             434,520
AWLs revision (new proposed action).................                   1                  85                  85                 639              54,315
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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 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 affect intrastate aviation in Alaska, and
    (4) 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.

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 removing amendment 39-15517 (73 FR
25974, May 8, 2008) and adding the following new AD:

The Boeing Company: Docket No. FAA-2011-0304; Directorate Identifier
2010-NM-103-AD.

Comments Due Date

    (a) The FAA must receive comments on this AD action by May 23,
2011.

Affected ADs

    (b) This AD supersedes AD 2008-10-11, Amendment 39-15517.
Certain requirements of this AD terminate certain requirements of AD
2008-11-07, Amendment 39-15529; AD 2008-06-03, Amendment 39-15415;
and AD 2009-06-20, Amendment 39-15857.

Applicability

    (c) This AD applies to all The Boeing Company Model 757-200, -
200PF, -200CB, and -300 series airplanes, certificated in any
category.

    Note 1:  This AD requires revisions to certain operator
maintenance documents to include new actions (e.g., inspections)
and/or Critical Design Configuration Control Limitations (CDCCLs).
Compliance with these actions and/or CDCCLs is required by 14 CFR
91.403(c). For airplanes that have been previously modified,
altered, or repaired in the areas addressed by these inspections,
the operator may not be able to accomplish the actions described in
the revisions. In this situation, to comply with 14 CFR 91.403(c),
the operator must request approval of an alternative method of
compliance (AMOC) according to paragraph (u) of this AD. The request
should include a description of changes to the required actions that
will ensure the continued operational safety of the airplane.

Subject

    (d) Air Transport Association (ATA) of America Code 28: Fuel.

Unsafe Condition

    (e) This AD results from a design review of the fuel tank
systems. The Federal Aviation Administration is 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

    (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.

Restatement of Requirements of AD 2008-10-11, With Revised Service
Information

Revision of Airworthiness Limitations (AWLs) Section

    (g) Before December 16, 2008, revise the AWLs section of the
Instructions for Continued Airworthiness (ICA) by incorporating the
information in the subsections specified in paragraphs (g)(1)
through (g)(3) of this AD into the MPD; except that the initial
inspections specified in Table 1 of this AD must be done at the
compliance times specified in Table 1. Accomplishing the
requirements of paragraph (l) of this AD terminates the requirements
of this paragraph.
    (1) Subsection E, ``AIRWORTHINESS LIMITATIONS--FUEL SYSTEMS,''
of Boeing Temporary Revision (TR) 09-008, dated March 2008, to
Section 9 of the Boeing 757 Maintenance Planning Data (MPD)
Document, D622N001-9.
    (2) Subsection F, ``PAGE FORMAT: SYSTEMS AIRWORTHINESS
LIMITATIONS,'' of Boeing TR 09-008, dated March 2008, to Section 9
of the Boeing 757 MPD Document, D622N001-9.
    (3) Subsection G, ``AIRWORTHINESS LIMITATIONS--FUEL SYSTEM
AWLs,'' AWLs No. 28-AWL-01 through No. 28-AWL-24 inclusive, of
Boeing TR 09-008, dated March 2008, to Section 9 of the Boeing 757
MPD Document, D622N001-9. As an optional action, AWLs No. 28-AWL-25
and No. 28-AWL-26, as identified in Subsection G of Boeing TR 09-
008, dated March 2008, to Section 9 of the Boeing 757 MPD Document,
D622N001-9, also may be incorporated into the AWLs section of the
ICA.

Initial Inspections and Repair

    (h) Do the inspections specified in Table 1 of this AD at the
compliance time identified in Table 1 of this AD, and repair any
discrepancy, in accordance with Subsection G of Boeing TR 09-008,
dated March 2008, or Boeing TR 09-010, dated July 2010, to Section 9
of the Boeing 757 MPD Document, D622N001-9, except as required by
paragraph (m) of this AD. The repair must be done before further
flight. Accomplishing the inspections identified in Table 1 of this
AD as part of a maintenance program before the applicable compliance
time specified in Table 1 of this AD constitutes compliance with the
requirements of this paragraph. After the effective date of this AD,
only Boeing TR 09-010, dated July 2010, to Section 9 of the Boeing
757 Maintenance Planning Data (MPD) Document, D622N001-9, may be
used.

                                          Table 1--Initial Inspections
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                                                               Compliance time (whichever occurs later)
           AWL No.                  Description      -----------------------------------------------------------
                                                             Threshold                   Grace period
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(1) 28-AWL-01...............  A detailed inspection   Within 120 months       Within 72 months after June 12,
                               of external wires       since the date of       2008 (the effective date of AD
                               over the center fuel    issuance of the         2008-10-11).
                               tank for damaged        original standard
                               clamps, wire chafing,   airworthiness
                               and wire bundles in     certificate or the
                               contact with the        date of issuance of
                               surface of the center   the original export
                               fuel tank.              certificate of
                                                       airworthiness.
(2) 28-AWL-03...............  A special detailed      Within 120 months       Within 24 months after June 12,
                               inspection of the       since the date of       2008.
                               lightning shield to     issuance of the
                               ground termination on   original standard
                               the out-of-tank fuel    airworthiness
                               quantity indicating     certificate or the
                               system to verify        date of issuance of
                               functional integrity.   the original export
                                                       certificate of
                                                       airworthiness.
(3) 28-AWL-14...............  A special detailed      Within 120 months       Within 60 months after June 12,
                               inspection of the       since the date of       2008.
                               fault current bond of   issuance of the
                               the fueling shutoff     original standard
                               valve actuator of the   airworthiness
                               center wing tank to     certificate or the
                               verify electrical       date of issuance of
                               bond.                   the original export
                                                       certificate of
                                                       airworthiness.
----------------------------------------------------------------------------------------------------------------

    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.''

    Note 3:  For the purposes of this AD, a special detailed
inspection is: ``An intensive examination of a specific item,
installation, or assembly to detect damage, failure, or
irregularity. The examination is likely to make extensive use of
specialized inspection techniques and/or equipment. Intricate
cleaning and substantial access or disassembly procedure may be
required.''

No Alternative Inspections, Inspection Intervals, or CDCCLs

    (i) After accomplishing the actions specified in paragraphs (g)
and (h) of this AD, no alternative inspections, inspection
intervals, or CDCCLs may be used unless the inspections, intervals,
or CDCCLs are approved as an AMOC in accordance with the procedures
specified in paragraph (u) of this AD.

Credit for Actions Done According to Previous Revisions of the MPD

    (j) Actions done before June 12, 2008, in accordance with
Section 9 of the Boeing 757 MPD Document, D622N001-9, Revision March
2006; Revision October 2006; Revision January 2007; or Revision
November 2007; are acceptable for compliance with the corresponding
requirements of paragraphs (g) and (h) of this AD.

Terminating Action for AD 2008-06-03, Amendment 39-15415

    (k) Incorporating AWLs No. 28-AWL-23, No. 28-AWL-24, and No. 28-
AWL-25 into the AWLs section of the ICA in accordance with paragraph
(g)(3) of this AD or the maintenance program in accordance with
paragraph (l)(3) of this AD terminates the action required by
paragraph (h)(2) of AD 2008-06-03. After the effective date of this
AD, only paragraph (l)(3) of this AD may be used.

New Requirements of This AD

Revision of Airworthiness Limitations (AWLs) Section

    (l) Within 6 months after the effective date of this AD, revise
the maintenance program by incorporating the information in the
subsections specified in paragraphs (l)(1) through (l)(3) of this
AD. Accomplishing the actions required by this paragraph terminates
the requirements of paragraph (g) of this AD.
    (1) Subsection E, ``AIRWORTHINESS LIMITATIONS--FUEL SYSTEMS,''
of Boeing TR 09-010, dated July 2010, to Section 9 of the Boeing 757
MPD Document, D622N001-9.
    (2) Subsection F, ``PAGE FORMAT: FUEL SYSTEMS AIRWORTHINESS
LIMITATIONS,'' of Boeing TR 09-010, dated July 2010, to Section 9 of
the Boeing 757 MPD Document, D622N001-9.
    (3) Subsection G, ``AIRWORTHINESS LIMITATIONS--FUEL SYSTEM
AWLs,'' AWLs No. 28-AWL-01 through No. 28-AWL-26 inclusive, of
Boeing TR 09-010, dated July 2010, to Section 9 of the Boeing 757
MPD Document, D622N001-9.

Compliance Time for AWL No. 28-AWL-03

    (m) The initial compliance time for AWL No. 28-AWL-03 of Boeing
TR 09-010, dated July 2010, to Section 9 of Boeing 757 MPD Document,
D622N001-9, is within 120 months since the date of issuance of the
original standard airworthiness certificate or the date of issuance
of the original export certificate of airworthiness, or within 24
months after the effective date of this AD, whichever occurs later.
Accomplishing the actions required by this paragraph terminates the
requirements of paragraph (h)(2) of this AD.

Initial Inspection Compliance Times for AWL No. 28-AWL-25 and 28-AWL-26

    (n) The initial inspection compliance time for AWL No. 28-AWL-25
of Boeing TR 09-010, dated July 2010, to Section 9 of Boeing 757 MPD
Document, D622N001-9, is within 72 months after accomplishing Boeing
Service Bulletin 757-28A0088.
    (o) The initial inspection compliance time for AWL No. 28-AWL-26
of Boeing TR 09-010, dated July 2010, to Section 9 of Boeing 757 MPD
Document, D622N001-9, is within 12 months after accomplishing Boeing
Service Bulletin 757-28A0105.

No Alternative Inspections, Inspection Intervals, or CDCCLs

    (p) After accomplishing the actions specified in paragraph (l)
of this AD, no alternative inspections, inspection intervals, or
CDCCLs may be used unless the inspections, intervals, or CDCCLs are
approved as an AMOC in accordance with the procedures specified in
paragraph (u) of this AD.

Terminating Action for AD 2008-11-07, Amendment 39-15529

    (q) Incorporating AWLs No. 28-AWL-20 and No. 28-AWL-26 into the
maintenance program in accordance with paragraph (l)(3) of this AD
terminates the actions required by paragraphs (j) and (m) of AD
2008-11-07.

Terminating Action for AD 2009-06-20, Amendment 39-15857

    (r) Incorporating AWL No. 28-AWL-22 into the maintenance program
in accordance with paragraph (l)(3) of this AD terminates the
actions required by paragraph (h) of AD 2009-06-20.

Credit for Actions Accomplished in Accordance With Previous Service
Information

    (s) Actions done before the effective date of this AD in
accordance with Section 9 of the Boeing 757 MPD Document, D622N001-
9, Revision December 2008, is acceptable for compliance with the
corresponding requirements of this AD.
    (t) Actions done before the effective date of this AD in
accordance with Subsection G of Boeing TR 09-008, dated March 2008,
to Section 9 of the Boeing 757 MPD Document, D622N001-9, is
acceptable for compliance with the requirements of paragraphs (n)
and (o) of this AD.

Explanation of CDCCL Requirements

    Note 4:  Notwithstanding any other maintenance or operational
requirements, components that have been identified as airworthy or
installed on the affected airplanes before the revision of the
maintenance program, as required by paragraphs (g) and (l) of this
AD, do not need to be reworked in accordance with the CDCCLs.
However, once the maintenance program has been revised, future
maintenance actions on these components must be done in accordance
with the CDCCLs.

Alternative Methods of Compliance (AMOCs)

    (u)(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. In accordance with 14
CFR 39.19, send your request to your principal inspector or local
Flight Standards District Office, as appropriate. If sending
information directly to the manager of the ACO, send it to the
attention of the person identified in the Related Information
section of this AD. Information may be e-mailed to<EMAIL_ADDRESS>    (2) Before using any approved AMOC, notify your appropriate
principal inspector, or lacking a principal inspector, the manager
of the local flight standards district office/certificate holding
district office.
    (3) AMOCs approved previously for AD 2008-10-11 are approved as
AMOCs for the corresponding provisions of this AD.

Related Information

    (v) For more information about this AD, contact Tak Kobayashi,
Aerospace Engineer, Propulsion Branch, ANM-140S, FAA, Seattle ACO,
1601 Lind Avenue, SW., Renton, Washington 98057-3356; phone: 425-
917-6499; fax:<PHONE_NUMBER>; e-mail<EMAIL_ADDRESS>    (w) 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<PHONE_NUMBER>; e-mail
<EMAIL_ADDRESS>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<PHONE_NUMBER>.

    Issued in Renton, Washington, on March 25, 2011.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. 2011-8407 Filed 4-7-11; 8:45 am]
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