AD 2010-14-13

final rule

Airworthiness Directives; The Boeing Company Model 777 Airplanes

AD Number: 2010-14-13
Status: final_rule
Effective Date: August 17, 2010
Product Category: aircraft
Docket: Docket No. FAA-2009-1249
FR Citation: 75 FR 39811

Applicability

Type	Manufacturer	Model	Details
aircraft	The Boeing Company	777-200 Series	Airworthiness Directives; The Boeing Company Model 777 Airplanes
aircraft	The Boeing Company	777-200LR Series	Airworthiness Directives; The Boeing Company Model 777 Airplanes
aircraft	The Boeing Company	777-300 Series	Airworthiness Directives; The Boeing Company Model 777 Airplanes
aircraft	The Boeing Company	777-300ER Series	Airworthiness Directives; The Boeing Company Model 777 Airplanes

Unsafe Condition

Bolt securing the downstop migrating out of the fitting and contacting the slat can, causing a hole in the inboard main track slat can for outboard slat number 12. This can lead to fuel leakage into the fixed wing leading edge in excess of the capacity of the draining system, potentially resulting in an uncontained fire.

AI-generated summary from the source AD text. Verify against the official source before acting.

Required Actions

Inspect the bolt, nut, and downstop of the slat track assembly to check for missing parts and ensure thread protrusion is within specified limits. Inspect slat cans at outboard slat number 3 and 12 outboard main track locations for holes and wear damage. Replace downstop hardware for outboard slats number 3 and 12 outboard and inboard main track locations if necessary. Perform related investigative and corrective actions as needed.

AI-generated summary from the source AD text. Verify against the official source before acting.

Compliance Time

Within 6 months of the effective date of the AD.

AI-generated summary from the source AD text. Verify against the official source before acting.

Affected Aircraft

The Boeing Company Model 777 airplanes, as specified in the AD, with certain configurations or service history as outlined in the referenced service bulletin.

AI-generated summary from the source AD text. Verify against the official source before acting.

Federal Register Abstract

We are adopting a new airworthiness directive (AD) for certain Model 777 airplanes. This AD requires inspecting the bolt, nut, and downstop of the slat track assembly to determine if the bolt, nut, or stops are missing and to determine if the thread protrusion of the bolt from the nut is within specified limits and parts are correctly installed, and related investigative and corrective actions if necessary. For certain airplanes, this AD also requires inspecting the slat cans at the outboard slat number 3 and 12 outboard main track locations for holes and wear damage, and corrective actions if necessary; and replacing the downstop hardware for the outboard slats number 3 and 12 outboard and inboard main track locations. This AD results from a report of a hole in the inboard main track slat can for outboard slat number 12 on a Model 777 airplane. The hole was caused when the bolt securing the downstop migrated out of the fitting and contacted the slat can. We are issuing this AD to detect and correct damage to the outboard slat main track slat cans, which can allow fuel leakage into the fixed wing leading edge in excess of the capacity of the draining system. Excess fuel leakage could result in an uncontained fire.

Document Text

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[Federal Register Volume 75, Number 133 (Tuesday, July 13, 2010)]
[Rules and Regulations]
[Pages 39811-39814]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2010-16201]

-----------------------------------------------------------------------

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2009-1249; Directorate Identifier 2009-NM-100-AD;
Amendment 39-16358; AD 2010-14-13]
RIN 2120-AA64

Airworthiness Directives; The Boeing Company Model 777 Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

-----------------------------------------------------------------------

SUMMARY: We are adopting a new airworthiness directive (AD) for certain
Model 777 airplanes. This AD requires inspecting the bolt, nut, and
downstop of the slat track assembly to determine if the bolt, nut, or
stops are missing and to determine if the thread protrusion of the bolt
from the nut is within specified limits and parts are correctly
installed, and related investigative and corrective actions if
necessary. For certain airplanes, this AD also requires inspecting the
slat cans at the outboard slat number 3 and 12 outboard main track
locations for holes and wear damage, and corrective actions if
necessary; and replacing the downstop hardware for the outboard slats
number 3 and 12 outboard and inboard main track locations. This AD
results from a report of a hole in the inboard main track slat can for
outboard slat number 12 on a Model 777 airplane. The hole was caused
when the bolt securing the downstop migrated out of the fitting and
contacted the slat can. We are issuing this AD to detect and correct
damage to the outboard slat main track slat cans, which can allow fuel
leakage into the fixed wing leading edge in excess of the capacity of
the draining system. Excess fuel leakage could result in an uncontained
fire.

DATES: This AD is effective August 17, 2010.
The Director of the Federal Register approved the incorporation by
reference of a certain publication listed in the AD as of August 17,
2010.

ADDRESSES: 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 <a href="/cdn-cgi/l/email-protection#c3aea6eda1aca6a0acae83a1aca6aaada4eda0acae">[email&#160;protected]</a>;
Internet <a href="https://www.myboeingfleet.com">https://www.myboeingfleet.com</a>.

Examining the AD Docket

You may examine the AD docket on the Internet at <a href="http://www.regulations.gov">http://www.regulations.gov</a>; 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, the regulatory evaluation,
any comments received, and other information. The address for the
Docket Office (telephone 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: Duong Tran, Aerospace Engineer,
Airframe Branch, ANM-120S, FAA, Seattle Aircraft Certification Office,
1601 Lind Avenue SW., Renton, Washington 98057-3356; telephone (425)
917-6452; fax (425) 917-6590.

SUPPLEMENTARY INFORMATION:

Discussion

We issued a notice of proposed rulemaking (NPRM) to amend 14 CFR
part 39 to include an airworthiness directive (AD) that would apply to
certain Model 777 airplanes. That NPRM was published in the Federal
Register on January 7, 2010 (75 FR 950). That NPRM proposed to require
inspecting the bolt, nut, and downstop of the slat track assembly to
determine

[[Page 39812]]

if the bolt, nut, or stops are missing and to determine if the thread
protrusion of the bolt from the nut is within specified limits and
parts are correctly installed, and related investigative and corrective
actions if necessary. For certain airplanes, that NPRM also proposed to
require inspecting the slat cans at the outboard slat number 3 and 12
outboard main track locations for holes and wear damage, and corrective
actions if necessary; and replacing the downstop hardware for the
outboard slats number 3 and 12 outboard and inboard main track
locations.

Relevant Service Information

We have reviewed Boeing Service Bulletin 777-57A0064, Revision 1,
dated May 6, 2010. The NPRM referred to Boeing Alert Service Bulletin
777-57A0064, dated March 26, 2009, as the appropriate source of service
information. Boeing Service Bulletin 777-57A0064, Revision 1, dated May
6, 2010, clarifies procedures, deletes a requirement, adds a note to
allow a different fastener, revises an incorrect chamfer callout, and
adds information that was published in Boeing Information Notice 777-
57A0064 IN 01 and 777-57A0064 IN 02. Boeing Service Bulletin 777-
57A0064, Revision 1, dated May 6, 2010, does not require additional
work.

Comments

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

Support for the NPRM

Continental Airlines (Continental) supports the intent of the NPRM.

Request To Add Exception for Group 1 Airplanes

Boeing requests that we revise the NPRM to add a statement to
paragraph (h) of the NPRM stating, ``The outboard main track locations
for slats 3 and 12 are excluded from the inspection defined in Table 3
of Boeing Alert Service Bulletin 777-57A0064, dated March 26, 2009.''
Boeing states that, for Group 1 airplanes, the slat tracks do not
penetrate into the wing fuel tank at these locations. Boeing also
states that, for all Group 2 airplanes, this inspection is accomplished
via Table 4 of Boeing Alert Service Bulletin 777-57A0064, dated March
26, 2009. Boeing Alert Service Bulletin 777-57A0064, dated March 26,
2009, states that for only Group 2 airplanes the outboard main track
locations at slats 3 and 12 must be inspected. Boeing notes that it
plans to issue a new revision to this service bulletin in June 2010
that contains this information.
We disagree with the commenter that such a revision is necessary.
We have updated this final rule to refer to Boeing Service Bulletin
777-57A0064, Revision 1, dated May 6, 2010. Boeing Service Bulletin
777-57A0064, Revision 1, dated May 6, 2010, has corrected this
information. We have added Boeing Service Bulletin 777-57A0064,
Revision 1, dated May 6, 2010, as the appropriate source of service
information for the actions required by this AD, including paragraph
(g)(2) of this AD (in paragraph (g)(2) of the NPRM we referred to the
original issue of the service bulletin for the compliance times but did
not specifically reference the service bulletin as the applicable
source of service information for doing the actions). We have also
added paragraph (j) to this final rule to provide credit for actions
done in accordance with Boeing Alert Service Bulletin 777-57A0064,
dated March 26, 2009.

Request To Add Exception for Group 2 Airplanes

Boeing further requests that we revise paragraph (h) of the NPRM to
state, ``For airplanes defined as Group 2 in Boeing Alert Service
Bulletin 777-57A0064, dated March 26, 2009, it is not necessary to
perform the torque check on the downstop hardware for slats 3 and 12 as
defined in Table 2 of Boeing Alert Service Bulletin 777-57A0064, dated
March 26, 2009.'' Boeing states that at locations where a fastener is
to be replaced by subsequent instructions in Boeing Alert Service
Bulletin 777-57A0064, dated March 26, 2009, a torque check is redundant
and is not a technical requirement. Boeing states that the visual
inspections are still in place to guarantee that damage caused by a
loose fastener will be caught. Boeing also adds that Boeing Alert
Service Bulletin 777-57A0064, dated March 26, 2009, specifies
compliance times for the fastener replacement that are less than those
for the torque check. Boeing notes that it plans to issue a new
revision to this service bulletin in June 2010 that contains this
information.
We agree with the commenter that such a revision is necessary. We
have updated this final rule to refer to Boeing Service Bulletin 777-
57A0064, Revision 1, dated May 6, 2010. However, we have added a new
paragraph (i) to this final rule to clarify that this measurement is
not necessary on slats 3 and 12. We have added Boeing Service Bulletin
777-57A0064, Revision 1, dated May 6, 2010, as the primary source of
service information for accomplishing the actions required by this AD.

Request To Increase the Inspection Threshold to 12 Months

Continental requests that we revise the compliance time for the
inspection from 6 months to 12 months after the effective date of the
AD. Continental states that the current 6-month compliance time will
not provide a practical period in which to complete the full inspection
for its Model 777 fleet based on their maintenance schedule.
Continental states that a 12-month threshold would not compromise the
safety of the airplane because there are existing zonal inspection
requirements in the referenced Maintenance Planning Document/
Maintenance Review Board (MPD/MRB) tasks, discrepancies in the area of
interest could be detected through the required routine inspections.
Continental states that with a frequency of every 1,125 days from
delivery, most affected airplanes should have had at least one
inspection performed in accordance with the MPD/MRB tasks.
We disagree. Due to the urgent nature of a potential excessive fuel
leakage, we do not find it appropriate to revise the inspection
threshold. Furthermore, the MPD/MRB zonal inspection requirements are
not intense enough to detect certain unobvious discrepancies (e.g.,
loose bolts and insufficient nut torque). However, under the provisions
of paragraph (k) of this AD, we will consider requests for approval of
an extension of the compliance time if sufficient data are submitted to
substantiate that the extension would provide an acceptable level of
safety. We have not changed the AD in regard to this issue.

Request To Clarify Requirements of Downstop Fitting Rework

EVA Airlines requests that we incorporate the information from
Boeing Information Notice 777-57A0064 IN 01, dated May 28, 2009, which
states that the chamfer for the -2 stop fitting in view B-B of Appendix
A of Boeing Alert Service Bulletin 777-57A0064, dated March 26, 2009,
should be ``0.820-0.850 x 90 Degrees-120 Degrees'' instead of ``0.820-
0.050 x 90 Degrees-120 Degrees.''
We agree that this information should be incorporated into the AD.
Boeing Service Bulletin 777-57A0064, Revision 1, dated May 6, 2010,
corrects this information. As stated previously, we have changed this
AD to refer to Boeing Service Bulletin 777-57A0064, Revision 1, dated
May 6, 2010, as the primary source of service information for
accomplishing the actions required by this AD.

[[Page 39813]]

Conclusion

We reviewed the relevant data, considered the comments received,
and determined that air safety and the public interest require adopting
the AD with the changes described previously. We also determined that
these changes will not increase the economic burden on any operator or
increase the scope of the AD.

Explanation of Change to Costs of Compliance

Since issuance of the NPRM, we have increased the labor rate used
in the Costs of Compliance from $80 per work-hour to $85 per work-hour.
The Costs of Compliance information, below, reflects this increase in
the specified hourly labor rate.

Costs of Compliance

We estimate that this AD would affect 129 airplanes of U.S.
registry. The following table provides the estimated costs for U.S.
operators to comply with this AD.

Table--Estimated Costs
--------------------------------------------------------------------------------------------------------------------------------------------------------
Number of
Average U.S.-
Action Work hours labor rate Parts Cost per product registered Fleet cost
per hour airplanes
--------------------------------------------------------------------------------------------------------------------------------------------------------
Inspection for Group 1 airplanes. 39 $85 $0 $3,315 per 127 $421,005 per inspection cycle.
inspection cycle.
Inspection for Group 2 airplanes. 55 85 0 4,675 per 2 9,350 per inspection cycle.
inspection cycle.
Replacement for Group 2 airplanes 8 85 9,267 9,947.............. 2 19,894.
--------------------------------------------------------------------------------------------------------------------------------------------------------

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

This AD will not have federalism implications under Executive Order
13132. This AD will 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 this AD:
(1) Is not a ``significant regulatory action'' under Executive
Order 12866,
(2) Is not a ``significant rule'' under 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.

Adoption of the Amendment

0
Accordingly, under the authority delegated to me by the Administrator,
the FAA amends 14 CFR part 39 as follows:

PART 39--AIRWORTHINESS DIRECTIVES

0
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]

0
2. The FAA amends Sec. 39.13 by adding the following new AD:

2010-14-13 The Boeing Company: Amendment 39-16358. Docket No. FAA-
2009-1249; Directorate Identifier 2009-NM-100-AD.

Effective Date

(a) This airworthiness directive (AD) is effective August 17,
2010.

Affected Ads

(b) None.

Applicability

(c) This AD applies to The Boeing Company Model 777-200, -200LR,
-300, and -300ER airplanes, certificated in any category; as
identified in Boeing Service Bulletin 777-57A0064, Revision 1, dated
May 6, 2010.

Subject

(d) Air Transport Association (ATA) of America Code 57: Wings.

Unsafe Condition

(e) This AD results from a report of a hole in the inboard main
track slat can for outboard slat number 12 on a Model 777 airplane.
The Federal Aviation Administration is issuing this AD to detect and
correct damage to the outboard slat main track slat cans, which can
allow fuel leakage into the fixed wing leading edge in excess of the
capacity of the draining system. Excess fuel leakage could result in
an uncontained fire.

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.

Inspect the Slat Main Track Stop Hardware and Measure the Torque of the
Slat Main Track Stop Hardware

(g) At the applicable time specified in paragraph 1.E.,
``Compliance,'' of Boeing Service Bulletin 777-57A0064, Revision 1,
dated May 6, 2010, except as required by paragraph (h) of this AD:
Do the applicable actions specified in paragraphs (g)(1) and (g)(2)
of this AD.
(1) For all airplanes: Do a detailed inspection of the slat main
track stop hardware to determine if the bolt, nut, or stops are
missing and to determine if the thread protrusion of the bolt from
the nut is within specified limits, and do all applicable

[[Page 39814]]

related investigative and corrective actions, in accordance with the
Accomplishment Instructions of Boeing Service Bulletin 777-57A0064,
Revision 1, dated May 6, 2010, except as required by paragraph (i)
of this AD. Do all applicable related investigative and corrective
actions at the applicable time specified in paragraph 1.E.,
``Compliance,'' of Boeing Service Bulletin 777-57A0064, Revision 1,
dated May 6, 2010, except as required by paragraph (h) of this AD.
(2) For airplanes identified as Group 2 airplanes in Boeing
Service Bulletin 777-57A0064, Revision 1, dated May 6, 2010: Do a
detailed inspection of the slat cans at the outboard slat number 3
and 12 outboard main track locations for holes and wear damage and
do all applicable corrective actions, and replace the downstop
hardware for the outboard slats number 3 and 12 outboard and inboard
main track locations, in accordance with the Accomplishment
Instructions of Boeing Service Bulletin 777-57A0064, Revision 1,
dated May 6, 2010. Do all applicable corrective actions at the
applicable time specified in paragraph 1.E., ``Compliance,'' of
Boeing Service Bulletin 777-57A0064, Revision 1, dated May 6, 2010.

Exception to the Service Bulletin

(h) Where Boeing Service Bulletin 777-57A0064, Revision 1, dated
May 6, 2010, specifies a compliance time after the date on the
service bulletin, this AD requires compliance within the specified
compliance time after the effective date of this AD.
(i) Where Boeing Service Bulletin 777-57A0064, Revision 1, dated
May 6, 2010, specifies measuring torque of the nuts of the slat main
track stop hardware of slats 3 and 12, this AD does not require that
action for Group 2 airplanes.

Credit for Actions Accomplished Previously

(j) Actions accomplished before the effective date of this AD
according to Boeing Alert Service Bulletin 777-57A0064, dated March
26, 2009, are considered acceptable for compliance with the
corresponding actions specified in this AD.

Alternative Methods of Compliance (AMOCs)

(k)(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. Send information to
ATTN: Duong Tran, Aerospace Engineer, Airframe Branch, ANM-120S,
FAA, Seattle Aircraft Certification Office, 1601 Lind Avenue, SW.,
Renton, Washington 98057-3356; telephone (425) 917-6452; fax (425)
917-6590. Or, e-mail information to <a href="/cdn-cgi/l/email-protection#f3cadeb2bdbedea0969287879f96deb2b0bcdeb2bebcb0dea196828696808780b3959292dd949c85">[email&#160;protected]</a>.
(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 principal maintenance inspector (PMI) or
principal avionics inspector (PAI), as appropriate, or lacking a
principal inspector, your local Flight Standards District Office.
The AMOC approval letter must specifically reference this AD.
(3) An AMOC that provides an acceptable level of safety may be
used for any repair required by this AD, if it is approved by the
Boeing Commercial Airplanes Organization Designation Authorization
(ODA) that has been authorized by the Manager, Seattle ACO, to make
those findings. For a repair method to be approved, the repair must
meet the certification basis of the airplane, and the approval must
specifically refer to this AD.

Material Incorporated by Reference

(l) You must use Boeing Service Bulletin 777-57A0064, Revision
1, dated May 6, 2010, to do the actions required by this AD, unless
the AD specifies otherwise.
(1) The Director of the Federal Register approved the
incorporation by reference of this service information under 5
U.S.C. 552(a) and 1 CFR part 51.
(2) 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
<a href="/cdn-cgi/l/email-protection#f9949cd79b969c9a9694b99b969c90979ed79a9694">[email&#160;protected]</a>; Internet <a href="https://www.myboeingfleet.com">https://www.myboeingfleet.com</a>.
(3) You may review copies of the 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.
(4) You may also review copies of the service information that
is incorporated by reference at the National Archives and Records
Administration (NARA). For information on the availability of this
material at NARA, call 202-741-6030, or go to: <a href="http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html">http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html</a>.

Issued in Renton, Washington on June 21, 2010.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. 2010-16201 Filed 7-12-10; 8:45 am]
BILLING CODE 4910-13-P

Source: Official FAA Source ↗

Retrieved: Apr 6, 2026

Rights: U.S. Government Public Domain

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View Official Source ↗ Find More ADs for The Boeing Company 777-200 Series

Airworthiness Directives; The Boeing Company Model 777 Airplanes

Applicability

Unsafe Condition

Required Actions

Compliance Time

Affected Aircraft

Federal Register Abstract

Document Text

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