Document ID: FAA-2014-0523-0007
Agency: faa
Document Type: Rule
Title: Airworthiness Directives: The Boeing Company Airplanes
Posted Date: 2015-09-02T04:00Z

[Federal Register Volume 80, Number 170 (Wednesday, September 2, 2015)]
[Rules and Regulations]
[Pages 52948-52953]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2015-20696]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2014-0523; Directorate Identifier 2014-NM-050-AD; 
Amendment 39-18246; AD 2015-17-13]
RIN 2120-AA64

Airworthiness Directives; The Boeing Company Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

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SUMMARY: We are adopting a new airworthiness directive (AD) for certain 
The Boeing Company Model 777-200 and -300 series airplanes equipped 
with Pratt and Whitney engines. This AD was prompted by reports of 
blocked drain lines at the engine forward strut that caused flammable 
fluid to accumulate in a flammable leakage zone. This AD requires 
repetitive functional checks for blockage of the forward strut drain 
line and doing corrective actions if necessary, and a one-time cleaning 
of certain forward strut drain lines. This AD also provides an optional 
replacement of the drain lines and installation of insulation blankets, 
and a revision of the maintenance or inspection program, as applicable, 
to incorporate a certain airworthiness limitation, which would 
terminate the repetitive checks of the forward strut drain line. We are 
issuing this AD to detect and correct blockage of forward strut drain 
lines, which could cause flammable fluids to collect in the

[[Page 52949]]

forward strut area and potentially cause an uncontrolled fire or cause 
failure of engine attachment structure and consequent airplane loss.

DATES: This AD is effective October 7, 2015.
    The Director of the Federal Register approved the incorporation by 
reference of a certain publication listed in this AD as of October 7, 
2015.

ADDRESSES: For service information identified in this AD, contact 
Boeing Commercial Airplanes, Attention: Data & Services Management, 
P.O. Box 3707, MC 2H-65, Seattle, WA 98124-2207; telephone 206-544-
5000, extension 1; fax 206-766-5680; Internet https://www.myboeingfleet.com. You may view this referenced service information 
at the FAA, Transport Airplane Directorate, 1601 Lind Avenue SW., 
Renton, WA. For information on the availability of this material at the 
FAA, call 425-227-1221. It is also available on the Internet at http://www.regulations.gov by searching for and locating Docket No. FAA-2014-
0523.

Examining the AD Docket

    You may examine the AD docket on the Internet at http://www.regulations.gov by searching for and locating Docket No. FAA-2014-
0523; 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 (phone: 800-647-
5527) is Docket 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: Kevin Nguyen, Aerospace Engineer, 
Propulsion Branch, ANM-140S, FAA, Seattle Aircraft Certification 
Office, 1601 Lind Avenue SW., Renton, WA 98057-3356; phone: 425-917-
6501; fax: 425-917-6590; email: kevin.nguyen@faa.gov.

SUPPLEMENTARY INFORMATION: 

Discussion

    We issued a notice of proposed rulemaking (NPRM) to amend 14 CFR 
part 39 by adding an AD that would apply to certain The Boeing Company 
Model 777-200 and -300 series airplanes equipped with Pratt and Whitney 
engines. The NPRM published in the Federal Register on August 7, 2014 
(79 FR 46201). The NPRM was prompted by reports of blocked drain lines 
at the engine forward strut that caused flammable fluid to accumulate 
in a flammable leakage zone. The NPRM proposed to require repetitive 
functional checks for blockage of the forward strut drain line and 
doing corrective actions (including cleaning or replacing any blocked 
drain lines) if necessary, and a one-time cleaning of certain forward 
strut drain lines. We are issuing this AD to detect and correct 
blockage of forward strut drain lines, which could cause flammable 
fluids to collect in the forward strut area and potentially cause an 
uncontrolled fire or cause failure of engine attachment structure and 
consequent airplane loss.
    This AD requires revisions to certain operator maintenance 
documents to include new actions (e.g., inspections). Compliance with 
these actions is required by 14 CFR 91.403(c). For airplanes that have 
been previously modified, altered, or repaired in the areas addressed 
by this AD, 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 for an alternative method 
of compliance according to paragraph (l) of this AD. The request should 
include a description of changes to the required inspections that will 
ensure the continued operational safety of the airplane.

Related Rulemaking

    On September 23, 2014, we issued AD 2014-20-10, Amendment 39-17983 
(79 FR 60331, October 7, 2014), for certain The Boeing Company Model 
777-200 and -300 series airplanes. AD 2014-20-10 superseded AD 2013-11-
14, Amendment 39-17474 (78 FR 35749, June 14, 2013). AD 2014-20-10 
currently requires repetitive general visual inspections of the strut 
forward dry bay for the presence of hydraulic fluid, and related 
investigative and corrective actions (including checking drain lines 
for blockage due to hydraulic fluid coking; cleaning or replacing drain 
lines to allow drainage) if necessary; and adds airplanes to the 
applicability. AD 2014-20-10 was prompted by reports of hydraulic fluid 
contamination (including contamination caused by hydraulic fluid in its 
liquid, vapor, and/or solid (coked) form) found in the strut forward 
dry bay. The actions required by 2014-20-10 are intended to detect and 
correct hydraulic fluid contamination of the strut forward dry bay, 
which could result in hydrogen embrittlement of the titanium forward 
engine mount bulkhead fittings, and consequent inability of the 
fittings to carry engine loads and resulting in engine separation. 
Hydrogen embrittlement also could cause a through-crack formation 
across the fittings through which an engine fire could breach into the 
strut, resulting in an uncontained strut fire.
    On December 22, 2014, we issued AD 2015-01-01, Amendment 39-18062 
(80 FR 3158, January 22, 2015) for certain The Boeing Company Model 
777-200 and -300 series airplanes. AD 2015-01-01 superseded AD 2011-09-
11, Amendment 39-16673 (76 FR 24354, May 2, 2011). AD 2015-01-01 
currently requires repetitive inspections for hydraulic fluid 
contamination of the interior of the strut disconnect assembly; 
repetitive inspections for discrepancies of the interior of the strut 
disconnect assembly, if necessary; repetitive inspections of the 
exterior of the strut disconnect assembly for cracks, if necessary; and 
corrective action if necessary. AD 2015-01-01 also provides an optional 
terminating action for the inspections and adds, for certain airplanes, 
an inspection of the side and top cover plates to determine if all 
cover plate attach fasteners have been installed, installing any 
missing fasteners including doing an inspection for damage, and repair 
if necessary.
    AD 2015-01-01, Amendment 39-18062 (80 FR 3158, January 22, 2015) 
was prompted by reports of side and top cover plates installed with 
missing fastener bolts, which could result in an unsealed opening on 
the system disconnect assembly. The actions required by AD 2015-01-01 
are intended to detect and correct hydraulic fluid contamination, which 
could cause cracking of titanium parts in the system disconnect 
assembly. The actions of 2015-01-01 are also intended to detect and 
correct missing fasteners, which could result in unsealed openings on 
the system disconnect assembly. Both unsafe conditions can compromise 
the engine firewall and result in fire hazards for both the engine 
compartment and the strut.

Comments

    We gave the public the opportunity to participate in developing 
this AD. The following presents the comments received on the NPRM (79 
FR 46201, August 7, 2014) and the FAA's response to each comment.

Request To Add Service Information as Optional Terminating Action

    Boeing and Japan Airlines (JAL) requested that we add Boeing 
Special Attention Service Bulletin 777-71-0055, dated June 12, 2014, as 
a terminating action to the NPRM (79 FR

[[Page 52950]]

46201, August 7, 2014). Boeing specifically requested that this service 
information be added in the Supplementary Information--Interim Action 
section and as a second paragraph to paragraph (i) of the NPRM. Boeing 
requested that paragraph (i) of the NPRM state that accomplishment of 
Boeing Special Attention Service Bulletin 777-71-0055, dated June 12, 
2014, terminates the requirements of Boeing Special Attention Service 
Bulletin 777-54-0027, Revision 1, dated September 12, 2013, and is an 
alternative means of compliance with this AD.
    We agree. Boeing Special Attention Service Bulletin 777-71-0055, 
dated June 12, 2014, which has since been revised as Revision 1, dated 
April 15, 2015, describes procedures that address the identified unsafe 
condition. These procedures include removing the forward strut drain 
lines; cleaning the left systems disconnect, strut forward lower spar, 
and forward fireseal pan drain lines; installing new forward strut 
drain lines and insulation blankets; and doing a functional leak check 
of the forward strut drain lines, and repair if any leaking is found.
    We have added new paragraph (i) to this AD to provide optional 
terminating action and redesignated subsequent paragraphs accordingly. 
Paragraph (i) of this AD states that accomplishment of Boeing Special 
Attention Service Bulletin 777-71-0055, Revision 1, dated April 15, 
2015, along with a revision of the maintenance or inspection program, 
as applicable, to incorporate a certain airworthiness limitation, 
terminates the requirements of paragraph (g)(1) of this AD at the 
modified area only.
    We have also added new paragraph (j) of this AD to specify that no 
alternative actions or intervals may be used after incorporating the 
airworthiness limitation unless the actions or intervals are approved 
as an alternative method of compliance (AMOC) in accordance with the 
procedures specified in paragraph (l) of this AD. We redesignated 
subsequent paragraphs accordingly.
    We have also added new paragraph (k) to this AD to give credit for 
actions required by paragraph (i) of this AD, if those actions were 
performed before the effective date of this AD using Boeing Special 
Attention Service Bulletin 777-71-0055, dated June 12, 2014. We 
redesignated subsequent paragraphs accordingly.
    In addition, we updated the ``Interim Action'' paragraph in the 
SUPPLEMENTARY INFORMATION section of the preamble of this final rule 
accordingly.

Request To Remove Requirement To Clean Forward Strut Drain Line

    All Nippon Airways (ANA) requested that we revise the NPRM (79 FR 
46201, August 7, 2014) to remove the phrase ``clean the forward strut 
drain line'' from paragraph (g)(1) of the NPRM. ANA stated that 
cleaning the forward strut drain line is not required if part 1, 
condition 1, in paragraph 3.B ``Work Instructions,'' of Boeing Special 
Attention Service Bulletin 777-54-0027, Revision 1, dated September 12, 
2013, is met.
    We agree because condition 1 is met when 354 or more ounces of 
water are collected within 2 minutes after the start of pouring water 
for the functional check of the forward strut drain line. Cleaning the 
blocked drain line is part of the corrective actions in condition 2 as 
specified in Boeing Special Attention Service Bulletin 777-54-0027, 
Revision 1, dated September 12, 2013. This change does not compromise 
safety or the intent of the AD, therefore, we have removed the phrase 
``clean the forward strut drain line,'' from paragraph (g)(1) of this 
final rule.

Request To Allow Alternate Tee Fitting Part Numbers

    ANA requested the NPRM (79 FR 46201, August 7, 2014) include three 
part numbers of the tee fitting. ANA indicated that paragraph 2.C., of 
Boeing Special Attention Service Bulletin 777-54-0027, Revision 1, 
dated September 12, 2013, states BACT16BR120612J tee fitting is 
required if replacement is necessary. ANA stated tee fittings having 
part numbers BACT16BR120612J, BACT16BR120612JN, and AS4139J120612 may 
be used according to a Boeing product standard parts list.
    We agree because the tee fitting part number BACT16BR120612J listed 
in Boeing Special Attention Service Bulletin 777-54-0027, Revision 1, 
dated September 12, 2013, is obsolete. We have added text to paragraph 
(g)(1) of this AD to allow alternate tee fitting part numbers 
BACT16BR120612JN and AS4139J120612, as long as the installation of the 
forward strut drain lines is accomplished in accordance with the 
Accomplishment Instructions of Boeing Special Attention Service 
Bulletin 777-54-0027, Revision 1, dated September 12, 2013.

Conclusion

    We reviewed the relevant data, considered the comments received, 
and determined that air safety and the public interest require adopting 
this AD with the changes described previously and minor editorial 
changes. We have determined that these minor changes:
     [Agr]re consistent with the intent that was proposed in 
the NPRM (79 FR 46201, August 7, 2014) for correcting the unsafe 
condition; and
     Do not add any additional burden upon the public than was 
already proposed in the NPRM (79 FR 46201, August 7, 2014).
    We also determined that these changes will not increase the 
economic burden on any operator or increase the scope of this AD.

Interim Action

    We consider this AD interim action. The manufacturer has issued 
Boeing Special Attention Service Bulletin 777-71-0055, Revision 1, 
dated April 15, 2015, which describes a modification that addresses the 
unsafe condition identified in this AD. This service information is an 
optional action in this AD. If final action is later identified, we 
might consider further rulemaking.

Related Service Information Under 1 CFR Part 51

    We reviewed the following Boeing service information.
     Boeing Special Attention Service Bulletin 777-54-0027, 
Revision 1, dated September 12, 2013. The service information describes 
procedures for doing a functional check for blockage of the forward 
strut drain lines and corrective actions.
     Boeing Special Attention Service Bulletin 777-71-0055, 
Revision 1, dated April 15, 2015. This service information describes 
procedures for replacing the forward strut drain lines and adding 
insulation blankets.
     Airworthiness Limitation 54-AWL-01, ``Forward Strut Drain 
Line,'' Section D.4, Pratt and Whitney Forward Strut Drain Line, of the 
Boeing 777 Maintenance Planning Data (MPD) Document Section 9, 
Airworthiness Limitations (AWLs) and Certification Maintenance 
Requirements (CMRs), D622W001-9, Revision October 2014. This service 
information describes an airworthiness limitation task for the 
functional check of the forward strut drain line.
    This service information is reasonably available because the 
interested parties have access to it through their normal course of 
business or by the means identified in the ADDRESSES section of this 
AD.

Costs of Compliance

    We estimate that this AD affects 54 airplanes of U.S. registry.
    We estimate the following costs to comply with this AD:

[[Page 52951]]

                                        Estimated Costs: Required Actions
----------------------------------------------------------------------------------------------------------------
                                                                                                 Cost on U.S.
              Action                    Labor cost        Parts cost      Cost per product        operators
----------------------------------------------------------------------------------------------------------------
Repetitive functional checks of 2  9 work-hours x $85               $0  $765 per inspection  $41,310 per
 struts per inspection cycle.       per hour = $765                      cycle.               inspection cycle.
                                    per inspection
                                    cycle.
One-time cleaning................  13 work-hours x $85               0  1,105..............  59,670.
                                    per hour = $1,105.
----------------------------------------------------------------------------------------------------------------

    We estimate the following costs to do any necessary repairs or 
replacements that would be required based on the results of the 
inspection. We have no way of determining the number of aircraft that 
might need these replacements:

                                               On-condition Costs
----------------------------------------------------------------------------------------------------------------
                Action                            Labor cost              Parts cost        Cost per product
----------------------------------------------------------------------------------------------------------------
Repair drain tube assemblies in up to   Up to 5 work-hours x $85 per                $0  Up to $425.
 2 struts.                               hour = $425.
Replace drain tube assemblies in up to  Up to 5 work-hours x $85 per      Up to $4,484  Up to $4,909.
 2 struts.                               hour = $425.
----------------------------------------------------------------------------------------------------------------

    According to the manufacturer, some of the costs of this AD may be 
covered under warranty, thereby reducing the cost impact on affected 
individuals. We do not control warranty coverage for affected 
individuals. As a result, we have included all costs in our cost 
estimate.

                                        Estimated Costs: Optional Actions
----------------------------------------------------------------------------------------------------------------
                                                                                                     Cost per
                   Action                                 Labor Cost                Parts Cost        product
----------------------------------------------------------------------------------------------------------------
Removal of drain tube assemblies...........  1 work[dash]hour x $85 per hour =                $0             $85
                                              $85.
Cleaning of drain lines....................  6 work-hours x $85 per hour = $510.              $0            $510
Installation of new drain lines and          2 work-hours x $85 per hour = $170.         $17,250         $17,420
 insulation blankets.
Leak check of drain lines..................  1 work-hour x $85 per hour = $85...              $0             $85
Revision of maintenance or inspection        1 work-hour x $85 per hour = $85...              $0             $85
 program.
----------------------------------------------------------------------------------------------------------------

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),
    (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.

Adoption of the Amendment

    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 airworthiness 
directive (AD):

2015-17-13 The Boeing Company: Amendment 39-18246 ; Docket No. FAA-
2014-0523; Directorate Identifier 2014-NM-050-AD.

(a) Effective Date

    This AD is effective October 7, 2015.

(b) Affected ADs

    None.

(c) Applicability

    This AD applies to The Boeing Company Model 777-200 and -300 series 
airplanes, certificated in any category, equipped with Pratt & Whitney 
engines, as identified in Boeing Special Attention Service Bulletin 
777-54-0027, Revision 1, dated September 12, 2013.

[[Page 52952]]

(d) Subject

    Air Transport Association (ATA) of America Code 54, Nacelles/
pylons.

(e) Unsafe Condition

    This AD was prompted by reports of blocked drain lines at the 
engine forward strut that caused flammable fluid to accumulate in a 
flammable leakage zone. We are proposing this AD to detect and correct 
blockage of forward strut drain lines, which could cause flammable 
fluids to collect in the forward strut area and potentially cause an 
uncontrolled fire or cause failure of engine attachment structure and 
consequent airplane loss.

(f) Compliance

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

(g) Functional Check, Cleaning, and Corrective Actions

    At the applicable times specified in paragraph 1.E., 
``Compliance,'' of Boeing Special Attention Service Bulletin 777-54-
0027, Revision 1, dated September 12, 2013, except as provided by 
paragraph (h) of this AD, do the actions specified in paragraphs (g)(1) 
and (g)(2) of this AD, in accordance with the Accomplishment 
Instructions of Boeing Special Attention Service Bulletin 777-54-0027, 
Revision 1, dated September 12, 2013. Repeat the functional check 
required by paragraph (g)(1) of this AD, thereafter at the applicable 
times specified in paragraph 1.E., ``Compliance,'' of Boeing Special 
Attention Service Bulletin 777-54-0027, Revision 1, dated September 12, 
2013, until the terminating action specified in paragraph (i) of this 
AD is done.
    (1) Do a functional check for blockage of the forward strut drain 
line of the left and right strut and do all applicable corrective 
actions (including cleaning or replacing blocked drain tubes, repairing 
fluid leaks, and cleaning the inlet drain screen on the right system 
disconnect assembly inlet). Do all applicable corrective actions before 
further flight. Alternate tee fitting part numbers BACT16BR120612JN and 
AS4139J120612 may be used during the replacement of the forward strut 
drain lines, provided the installation is performed in accordance with 
the Accomplishment Instructions of Boeing Special Attention Service 
Bulletin 777-54-0027, Revision 1, dated September 12, 2013.
    (2) Do a one-time cleaning of the smaller forward strut drain lines 
connected to the left systems disconnect, the strut forward lower spar, 
and the forward fire seal pan inlets.

(h) Exception to the Service Information Specifications

    Where Boeing Special Attention Service Bulletin 777-54-0027, 
Revision 1, dated September 12, 2013, refers to a compliance time 
``after the Revision 1 date of this Service Bulletin,'' this AD 
requires compliance within the specified compliance time after the 
effective date of this AD.

(i) Optional Terminating Action

    Accomplishment of the actions specified in paragraphs (i)(1) 
through (i)(4) of this AD, for both the left and right struts, in 
accordance with the Accomplishment Instructions of Boeing Special 
Attention Service Bulletin 777-71-0055, Revision 1, dated April 15, 
2015, and accomplishment of the revision specified in paragraph (i)(5) 
of this AD, terminates the repetitive functional checks required by 
paragraph (g)(1) of this AD at the modified area only.
    (1) Disconnect and remove the forward strut drain lines.
    (2) Clean the left systems disconnect, the strut forward lower 
spar, and the forward fireseal pan drain lines.
    (3) Install new forward strut drain lines and insulation blankets.
    (4) Do a leak check of the forward strut drain lines, for any leak, 
and repair if any leaking is found.
    (5) Revise the maintenance or inspection program, as applicable, to 
incorporate Airworthiness Limitation 54-AWL-01, ``Forward Strut Drain 
Line'', Section D.4, Pratt and Whitney Forward Strut Drain Line, of the 
Boeing 777 Maintenance Planning Data (MPD) Document Section 9, 
Airworthiness Limitations (AWLs) and Certification Maintenance 
Requirements (CMRs), D622W001-9, Revision October 2014. The initial 
compliance time for Airworthiness Limitation 54-AWL-01 is within 2,000 
flight cycles or 1,500 days, whichever occurs first, after doing the 
actions specified in paragraphs (i)(1) through (i)(4) of this AD.

(j) No Alternative Actions or Intervals

    After accomplishing the revision required by paragraph (i)(5) of 
this AD, no alternative actions (e.g., inspections) or intervals may be 
used unless the actions or intervals are approved as an alternative 
method of compliance (AMOC) in accordance with the procedures specified 
in paragraph (l) of this AD.

(k) Credit for Previous Actions

    This paragraph provides credit for actions required by paragraph 
(i) of this AD, if those actions were performed before the effective 
date of this AD using Boeing Special Attention Service Bulletin 777-71-
0055, dated June 12, 2014, which is not incorporated by reference in 
this AD.

(l) Alternative Methods of Compliance (AMOCs)

    (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 paragraph (m)(1) of this AD. Information may be emailed to: 9-ANM-Seattle-ACO-AMOC-Requests@faa.gov.
    (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) 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.

(m) Related Information

    (1) For more information about this AD, contact Kevin Nguyen, 
Aerospace Engineer, Propulsion Branch, ANM-140S, FAA, Seattle Aircraft 
Certification Office, 1601 Lind Avenue SW., Renton, WA 98057-3356; 
phone: 425-917-6501; fax: 425-917-6590; email: kevin.nguyen@faa.gov.
    (2) Service information identified in this AD that is not 
incorporated by reference is available at the addresses specified in 
paragraphs (n)(3) and (n)(4) of this AD.

(n) Material Incorporated by Reference

    (1) The Director of the Federal Register approved the incorporation 
by reference (IBR) of the service information listed in this paragraph 
under 5 U.S.C. 552(a) and 1 CFR part 51.
    (2) You must use this service information as applicable to do the

[[Page 52953]]

actions required by this AD, unless the AD specifies otherwise.
    (i) Boeing Special Attention Service Bulletin 777-54-0027, Revision 
1, dated September 12, 2013.
    (ii) Boeing Special Attention Service Bulletin 777-71-0055, 
Revision 1, dated April 15, 2015.
    (iii) Airworthiness Limitation 54-AWL-01, ``Forward Strut Drain 
Line'', Section D.4, Pratt and Whitney Forward Strut Drain Line, of the 
Boeing 777 Maintenance Planning Data (MPD) Document Section 9, 
Airworthiness Limitations (AWLs) and Certification Maintenance 
Requirements (CMRs), D622W001-9, Revision October 2014.
    (3) For service information identified in this AD, contact Boeing 
Commercial Airplanes, Attention: Data & Services Management, P. O. Box 
3707, MC 2H-65, Seattle, WA 98124-2207; telephone 206-544-5000, 
extension 1; fax 206-766-5680; Internet https://www.myboeingfleet.com.
    (4) You may view this service information at FAA, Transport 
Airplane Directorate, 1601 Lind Avenue SW., Renton, WA. For information 
on the availability of this material at the FAA, call 425-227-1221.
    (5) You may view this 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: http://www.archives.gov/federal-register/cfr/ibr-locations.html.

    Issued in Renton, Washington, on August 14, 2015.
Michael Kaszycki,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 2015-20696 Filed 9-1-15; 8:45 am]
BILLING CODE 4910-13-P