Document ID: FAA-2019-0188-0010
Agency: faa
Document Type: Rule
Title: Airworthiness Directives: The Boeing Company Airplanes
Posted Date: 2019-12-12T05:00Z

[Federal Register Volume 84, Number 239 (Thursday, December 12, 2019)]
[Rules and Regulations]
[Pages 67854-67858]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2019-26708]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2019-0188; Product Identifier 2018-NM-174-AD; Amendment 
39-19781; AD 2019-22-02]
RIN 2120-AA64

Airworthiness Directives: The Boeing Company Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

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SUMMARY: The FAA is adopting a new airworthiness directive (AD) for all 
The Boeing Company Model 747-200B, 747-200C, 747-200F, 747-300, 747-
400, 747-400D, 747-400F, 747-8F, and 747-8 series airplanes. This AD 
was prompted by reports of uncommanded fore and aft movement of the 
Captain's and First Officer's seats. This AD requires, for the 
Captain's and First Officer's seats, repetitive horizontal actuator 
identifications, repetitive checks of the horizontal movement system 
(HMS), a detailed inspection of the HMS for certain airplanes, and 
applicable on-condition actions. This AD also requires an inspection to 
determine the part number and, if applicable, the serial number of the 
Captain's and First Officer's seats, and applicable on-condition 
actions. This AD also provides an optional terminating action for the 
repetitive actions for certain seats. The FAA is issuing this AD to 
address the unsafe condition on these products.

DATES: This AD is effective January 16, 2020.
    The Director of the Federal Register approved the incorporation by 
reference of certain publications listed in this AD as of January 16, 
2020.

ADDRESSES: For service information identified in this final rule, 
contact Boeing Commercial Airplanes, Attention: Contractual & Data 
Services (C&DS), 2600 Westminster Blvd., MC 110-SK57, Seal Beach, CA 
90740-5600; telephone 562-797-1717; internet https://www.myboeingfleet.com. You may view this service information at the 
FAA, Transport Standards Branch, 2200 South 216th St., Des Moines, WA. 
For information on the availability of this material at the FAA, call 
206-231-3195. It is also available on the internet at https://www.regulations.gov by searching for and locating Docket No. FAA-2019-
0188.

Examining the AD Docket

    You may examine the AD docket on the internet at https://www.regulations.gov by searching for and locating Docket No. FAA-2019-
0188; or in person at Docket Operations between 9 a.m. and 5 p.m., 
Monday through Friday, except Federal holidays. The AD docket contains 
this final rule, the regulatory evaluation, any comments received, and 
other information. The address for Docket Operations is 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: Brandon Lucero, Aerospace Engineer, 
Cabin Safety and Environmental Systems Section, FAA, Seattle ACO 
Branch, 2200 South 216th St., Des Moines, WA 98198; phone and fax: 206-
231-3569; email: Brandon.Lucero@faa.gov.

SUPPLEMENTARY INFORMATION: 

Discussion

    The FAA issued a notice of proposed rulemaking (NPRM) to amend 14 
CFR part 39 by adding an AD that would apply to all The Boeing Company 
Model 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-
400F, 747-8F, and 747-8 series airplanes. The NPRM published in the 
Federal Register on April 8, 2019 (84 FR 13840). The NPRM was prompted 
by reports of uncommanded fore and aft movement of the Captain's and 
First Officer's seats. The NPRM proposed to require, for the Captain's 
and First Officer's seats, repetitive horizontal actuator 
identifications, repetitive checks of the HMS, a detailed inspection of 
the HMS for certain airplanes, and applicable on-condition actions. The 
NPRM also proposed to require an inspection to determine the part 
number and, if applicable, the serial number of the Captain's and First 
Officer's seats and applicable on-condition actions. The NPRM also 
proposed to provide an optional terminating action for the repetitive 
actions for certain seats.
    The FAA is issuing this AD to address uncommanded fore and aft 
movement of the Captain's and First Officer's seats. An uncommanded 
fore or aft seat movement during a critical part of a flight, such as 
takeoff or landing, could cause a flight control obstruction or 
unintended flight control input, which could result in the loss of the 
ability to control the airplane.

Comments

    The FAA gave the public the opportunity to participate in 
developing this final rule. The following presents the comments 
received on the NPRM and the FAA's response to each comment.

Supportive Comments

    Virgin Atlantic Airways and commenters Zhangyi Ye and Sunita 
Kavthekar expressed their support for the NPRM.

Request To Clarify Maintenance Log Review Requirement

    Lufthansa Airlines (Lufthansa) stated that it is not possible for 
its mechanics to do a maintenance log review on wing using the 
procedures specified in Part A.1.c. of Ipeco Service Bulletin 258-25-
14, Issue 4, dated January 29, 2018.
    The FAA infers that the commenter is referring to the concurrent 
requirements specified in Boeing Special Attention Service Bulletin 
747-25-3653, Revision 1, dated October 19, 2018, as required by 
paragraph (g) of this AD.
    The FAA offers the following clarification: The concurrent

[[Page 67855]]

requirement in Ipeco Service Bulletin 258-25-14, Issue 4, dated January 
29, 2018, contains Note 4, which specifies: ``Part A--Inspection for 
the limit switch and the actuator assembly inspections can be 
accomplished on the aircraft or on a test fixture.'' Part A--Inspection 
requires checks of maintenance logs. Maintenance log reviews are 
completed off-wing, typically where maintenance logs are kept. The on-
aircraft, or on-test fixture activity described in Note 4, refers to 
the physical inspection of parts, which might be required, for example, 
to determine a part number, a serial number, or a condition. Therefore, 
the AD has not been changed in this regard.

Request To Clarify Certain Corrective Actions

    Lufthansa stated that Boeing Special Attention Service Bulletin 
747-25-3653, Revision 1, dated October 19, 2018, identified as a source 
of service information for performing certain actions in the proposed 
AD, does not provide a permanent and acceptable level of safety by 
including a redesign of the horizontal actuator (including the shaft), 
which is required to withstand and limit maximum loads to the 
horizontal output shaft to prevent failure at any phase of seat 
operation.
    Lufthansa added that this could be achieved by decoupling the shaft 
when the maximum force is exceeded, or by a shutdown of the electronics 
when the voltage is too high. Lufthansa added that further inspections 
at the intervals specified in the service information are not 
considered effective, and conditions leading to horizontal actuator 
shaft failures can occur at any time in between these inspections. 
Therefore, a more effective solution would be a crew procedure. 
Lufthansa concluded that it expected a terminating action for modified/
compliant airplanes (e.g., mandatory maintenance documentation 
amendments).
    The FAA offers the following clarification. The FAA has identified 
the unsafe condition in this final rule as an uncommanded fore or aft 
seat movement during a critical phase of flight, such as takeoff or 
landing, that could cause a flight control obstruction or unintended 
flight control input, which could result in the loss of the ability to 
control the airplane.
    The FAA does not concur with the commenter's statement that 
inspections at intervals are not effective. The FAA considered the 
safety implications in defining the actions required by this AD and 
determined the actions address the unsafe condition for all of the 
airplanes identified in this AD.
    In addition, the terminating action for certain seats (those having 
part number series 3A258) is identified in paragraph (j) of this AD, 
which specifies the installation of a serviceable Captain's or First 
Officer's seat as specified in, and in accordance with, the 
Accomplishment Instructions of Boeing Special Attention Service 
Bulletin 747-25-3653, Revision 1, dated October 19, 2018. A serviceable 
Captain's or First Officer's seat is defined in paragraph 3.A. of the 
referenced service information (i.e., certain seat part numbers that 
have an horizontal actuator with Artus part number (P/N) AD8650503 at 
`Amendment C' or later, which is the redesigned horizontal actuator 
that is designed to withstand the limit loads that contribute to the 
unsafe condition).
    Additionally, as specified in the referenced service information, 
if the horizontal actuator is not P/N AD8650503 `Amendment C' or later, 
the operator has the option to install a power-deactivated seat as 
specified in the appropriate airplane maintenance manual (AMM) 
procedure (AMM procedure 25-11-01-01), in lieu of the terminating 
action or until the horizontal actuator can be serviced in accordance 
with the appropriate service information. This provision removes the 
unsafe condition in the time between the inspections.
    For seats on which a terminating action is not yet available, the 
FAA has determined that repetitive checks of the HMS and the option to 
install a power-deactivated seat adequately address the unsafe 
condition. Thus, a crew procedure is not needed. However, if the FAA 
obtains and analyzes additional data that indicates the unsafe 
condition is not addressed by this AD, The FAA might consider further 
rulemaking to mandate a terminating action for all seats. The AD has 
not been changed in this regard.

Request To Change Applicability to Affected Components

    United Parcel Service Co. (UPS) asked that paragraph (g) of the 
proposed AD be changed to mandate accomplishment of the required 
actions by using certain Ipeco service bulletins. UPS stated that 
paragraph (g) would require accomplishment of the actions using Boeing 
Special Attention Service Bulletin 747-25-3653, Revision 1, dated 
October 19, 2018. UPS noted that for the 3A258-004X and 3A090-00XX 
seats, other than simple foreign object debris (FOD) inspections, the 
referenced Boeing service information effectively specifies 
accomplishment of the inspections and modifications per Ipeco Service 
Bulletin 258-25-14, Issue 4, dated January 29, 2018; and inspections 
per Ipeco Service Bulletin 258-25-13, Issue 3, dated November 27, 2017, 
or per Ipeco Service Bulletin 211-25-06, Issue 2, dated March 21, 2018; 
and inspections per Ipeco Service Bulletin 211-25-05, Issue 2, dated 
March 21, 2018.
    UPS recommends that paragraph (g) mandate the accomplishment of the 
applicable Ipeco service bulletin, depending on which seat is 
installed.
    UPS also stated that there are NPRMs that mandate the same Ipeco 
service information via fleet-specific Boeing service information on 
Model 757 and 767 airplanes. UPS asked that the proposed AD be 
applicable to the seats using Ipeco service information for compliance, 
instead of applicable to the airplanes using Boeing service information 
for compliance.
    UPS added that since the seats are interchangeable across several 
fleets, mandating ADs against those fleets could result in, for 
example, a specific seat being installed on a Model 747 airplane with 
records identifying compliance with a Model 767 airplane AD. UPS noted 
that this could lead to confusion and questions regarding compliance, 
when there is no notable difference between the two ADs, and the AD 
mandating a component service bulletin using a fleet service bulletin 
leaves a compliance trap for the operators. UPS recommends there be two 
separate ADs for this unsafe condition; one mandating the Ipeco service 
information, and one mandating the Boeing service information for the 
on-aircraft checks. UPS added that this would allow operators currently 
using the Ipeco service information at a shop or during a C-check to 
take credit for those actions at a component level in lieu of an 
airplane level.
    The FAA infers that the commenter is asking that the agency use the 
Ipeco service information instead of the Boeing service information; 
the FAA does not agree. The Ipeco service information would necessitate 
a component AD, and a component AD would require operators of all 
airplanes on which an Ipeco seat is installed to inspect their 
airplanes for the affected part number.
    However, the potential unsafe condition has been identified for 
only those airplanes that are specified in the Boeing service 
information. An unsafe condition has not been identified for the Ipeco 
seats identified in this AD that are installed on other aircraft types. 
Therefore, the FAA has determined that a component AD is not 
appropriate, which is why this AD addresses Model

[[Page 67856]]

747 series airplanes and other AD actions require similar actions on 
other Boeing airplanes for which the unsafe condition exists. Each AD 
addresses the unsafe condition that might exist on the airplanes 
identified in the applicability of each AD. If a seat has been removed 
from a Model 767 airplane and installed on a Model 747 airplane, the 
actions required by this AD would still be applicable to that seat even 
if that seat had previously been shown to be in compliance with a Model 
767 airplane AD.
    In addition, changing this airplane AD to a component AD would also 
require an additional public comment period and would unnecessarily 
delay issuance of this final rule. Therefore, the AD has not been 
changed in this regard.

Request To Expand Applicability

    One commenter, Arjun C, stated that movement of the Captain's and 
First Officer's seats during flight could potentially impair the 
ability to effectively fly the airplane and keep all passengers safe. 
The commenter pointed out that it might be worth expanding the 
applicability in the proposed AD to all civilian airplanes flying in 
U.S. airspace, and noted that simply calling out a single company might 
be a bit myopic in scope. The commenter concluded that, overall, the 
proposed AD should be effective if executed properly.
    The FAA does not agree with the request. The unsafe condition 
defined in this AD affects only airplanes with the seats having Ipeco 
part numbers identified in the referenced Boeing service information. 
Expanding the applicability as requested would cause an undue burden on 
operators with airplanes not subject to the unsafe condition. 
Therefore, the AD has not been changed in this regard.

Request To Revise Costs of Compliance Section

    Boeing asked that the ``Costs of Compliance'' section in the NPRM 
be changed to reflect the ``actual cost'' of all the actions. Boeing 
stated that the seat identification, inspection, and checks involve 
only labor and should not include the cost of the actuator. Boeing also 
noted that the ``Cost on U.S. Operators'' for the inspection should be 
changed from ``$8,075 per seat'' to ``$85 per seat,'' and for the 
checks the cost should be changed from ``$16,150 per seat, per check 
cycle'' to ``$170 per seat, per check cycle.''
    The FAA agrees that the costs of the seat identification, 
inspection, and checks do not include a cost for parts. In addition, 
the FAA has revised the figures for these actions in the ``Cost on U.S. 
Operators'' column by providing only the estimated fleet cost without 
reference to cost per seat.
    Boeing asked that the actuator cost for the overhaul or replacement 
be increased from ``Up to $6,400 per seat'' to ``Up to $16,091 per 
seat,'' based on information received from the parts manufacturer with 
the increased parts cost.
    The FAA agrees with the commenter's request to change the parts 
cost, for the reason provided. The FAA has changed the parts cost for 
the overhaul or replacement specified in the ``Costs of Compliance'' 
section accordingly.

Conclusion

    The FAA has reviewed the relevant data, considered the comments 
received, and determined that air safety and the public interest 
require adopting this final rule with the changes described previously 
and minor editorial changes. The FAA has determined that these minor 
changes:
     Are consistent with the intent that was proposed in the 
NPRM for addressing the unsafe condition; and
     Do not add any additional burden upon the public than was 
already proposed in the NPRM.
    The FAA also determined that these changes will not increase the 
economic burden on any operator or increase the scope of this final 
rule.

Related Service Information Under 1 CFR Part 51

    The FAA reviewed Boeing Special Attention Service Bulletin 747-25-
3644, Revision 1, dated July 17, 2018. This service information 
describes procedures for an inspection to determine the part number, 
and, if applicable, the serial number of the Captain's and First 
Officer's seats and applicable on-condition actions. On-condition 
actions include an inspection of each seat's fore/aft and vertical 
manual control levers for looseness; moving the adjustment nut, 
tightening the lock nut, readjusting the control lever, and doing a 
functional test; and installing a serviceable seat.
    The FAA also reviewed Boeing Special Attention Service Bulletin 
747-25-3653, Revision 1, dated October 19, 2018. This service 
information describes procedures for repetitive horizontal actuator 
identifications, repetitive checks of the HMS, a detailed inspection of 
the HMS, and applicable on-condition actions. On-condition actions 
include clearing the seat tracks of FOD, an overhaul of the HMS, and 
checks of the HMS. The service information also describes procedures 
for an optional terminating action for the repetitive checks by 
installing a serviceable Captain's or First Officer's seat.
    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.

Costs of Compliance

    The FAA estimates that this AD affects 95 airplanes of U.S. 
registry. The FAA estimates the following costs to comply with this AD:

                                      Estimated Costs for Required Actions
----------------------------------------------------------------------------------------------------------------
                                                                                                 Cost on U.S.
             Action                     Labor cost          Parts cost     Cost per product        operators
----------------------------------------------------------------------------------------------------------------
Horizontal actuator              1 work-hour x $85 per                $0  $85, per seat, per  Up to $16,150, per
 identification.                  hour = $85, per seat,                    identification      identification
                                  per identification                       cycle.              cycle
                                  cycle.
Detailed inspection, horizontal  1 work-hour x 85 per                  0  85, per seat......  Up to 16,150
 movement system.                 hour = 85, per seat.
Checks, horizontal movement      2 work-hour x 85 per                  0  170, per seat, per  Up to 32,300, per
 system.                          hour = 170, per seat,                    check cycle.        check cycle
                                  per check cycle.
Seat inspection (part and        1 work-hour x 85 per                  0  85, per seat......  16,150
 serial number).                  hour = 85, per seat.
----------------------------------------------------------------------------------------------------------------

[[Page 67857]]

    The FAA estimates the following costs to do any necessary on-
condition actions that will be required. The FAA has no way of 
determining the number of aircraft that might need these on-condition 
actions:

                                    Estimated Costs of On-Condition Actions *
----------------------------------------------------------------------------------------------------------------
               Action                         Labor cost                Parts cost           Cost per product
----------------------------------------------------------------------------------------------------------------
Overhaul or replacement, horizontal  Up to 15 work-hours x $85    Up to $16,091, per      Up to $17,366, per
 movement system.                     per hour = Up to $1,275,     seat.                   seat
                                      per seat.
Inspection of each seat's fore/aft   1 work-hour x 85 per hour =  0.....................  85, per seat
 and vertical manual control levers.  85, per seat.
Installation of serviceable seats..  1 work-hour x 85 per hour =  0.....................  85, per seat
                                      85, per seat.
Clearing FOD.......................  1 work-hour x 85 per hour =  0.....................  85, per seat
                                      85, per seat.
Functional test, adjusted control    1 work-hour x 85 per hour =  0.....................  85, per seat
 lever cable.                         85, per seat.
----------------------------------------------------------------------------------------------------------------
* The estimated cost for tooling to align an affected seat for adjustment of the control lever cable is up to
  $46,064.

    The FAA has received no definitive data that would enable the 
agency to provide cost estimates for the optional terminating action 
for the on-condition repetitive checks specified in this AD.

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.
    The FAA is 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.
    This AD is issued in accordance with authority delegated by the 
Executive Director, Aircraft Certification Service, as authorized by 
FAA Order 8000.51C. In accordance with that order, issuance of ADs is 
normally a function of the Compliance and Airworthiness Division, but 
during this transition period, the Executive Director has delegated the 
authority to issue ADs applicable to transport category airplanes and 
associated appliances to the Director of the System Oversight Division.

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) Will not affect intrastate aviation in Alaska, 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.

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):

2019-22-02 The Boeing Company: Amendment 39-19781; Docket No. FAA-
2019-0188; Product Identifier 2018-NM-174-AD.

(a) Effective Date

    This AD is effective January 16, 2020.

(b) Affected ADs

    None.

(c) Applicability

    This AD applies to all The Boeing Company Model 747-200B, 747-
200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, 747-8F, and 
747-8 series airplanes, certificated in any category.

(d) Subject

    Air Transport Association (ATA) of America Code 25, Equipment/
furnishings.

(e) Unsafe Condition

    This AD was prompted by reports of uncommanded fore and aft 
movement of the Captain's and First Officer's seats. The FAA is 
issuing this AD to address uncommanded fore and aft movement of the 
Captain's and First Officer's seats. An uncommanded fore or aft seat 
movement during a critical part of a flight, such as takeoff or 
landing, could cause a flight control obstruction or unintended 
flight control input, which could result in the loss of the ability 
to control the airplane.

(f) Compliance

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

(g) Repetitive Horizontal Actuator Identifications, Detailed 
Inspection, and Repetitive Checks of Horizontal Movement System and On-
Condition Actions

    Except as specified in paragraph (i) of this AD: At the 
applicable times specified in paragraph 1.E., ``Compliance,'' of 
Boeing Special Attention Service Bulletin 747-25-3653, Revision 1, 
dated October 19, 2018, do all applicable actions identified as 
``RC'' (required for compliance) in, and in accordance with, the 
Accomplishment Instructions of Boeing Special Attention Service 
Bulletin 747-25-3653, Revision 1, dated October 19, 2018.

(h) Seat Identification and On-Condition Actions

    Within 36 months after the effective date of this AD, do an 
inspection of the nameplate on the Captain's and First Officer's 
seats for the part number, and serial number as applicable, and do 
all applicable on-condition actions, in accordance with the 
Accomplishment Instructions of Boeing Special Attention Service 
Bulletin 747-25-3644, Revision 1, dated July 17, 2018. A review of 
the airplane maintenance records may be used for the seat inspection 
if the part number and serial number can be conclusively determined 
from that review.

(i) Exception to Service Information Specifications

    For purposes of determining compliance with the requirements of 
this AD: Where

[[Page 67858]]

Boeing Special Attention Service Bulletin 747-25-3653, Revision 1, 
dated October 19, 2018, uses the phrase ``the original issue date of 
this service bulletin,'' this AD requires using ``the effective date 
of this AD.''

(j) Terminating Action for Repetitive Actions for Certain Seats

    Installation of a serviceable Captain's or First Officer's seat 
as specified in, and in accordance with, the Accomplishment 
Instructions of Boeing Special Attention Service Bulletin 747-25-
3653, Revision 1, dated October 19, 2018, terminates the repetitive 
actions required by paragraph (g) of this AD, for that seat only.

(k) Alternative Methods of Compliance (AMOCs)

    (1) The Manager, Seattle ACO Branch, 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 certification office, send it to the attention of the 
person identified in paragraph (l) 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, modification, or alteration required by this AD 
if it is approved by The Boeing Company Organization Designation 
Authorization (ODA) that has been authorized by the Manager, Seattle 
ACO Branch, FAA, to make those findings. To be approved, the repair 
method, modification deviation, or alteration deviation must meet 
the certification basis of the airplane, and the approval must 
specifically refer to this AD.
    (4) Except as required by paragraph (i) of this AD: For service 
information that contains steps that are labeled as Required for 
Compliance (RC), the provisions of paragraphs (k)(4)(i) and (ii) of 
this AD apply.
    (i) The steps labeled as RC, including substeps under an RC step 
and any figures identified in an RC step, must be done to comply 
with the AD. If a step or substep is labeled ``RC Exempt,'' then the 
RC requirement is removed from that step or substep. An AMOC is 
required for any deviations to RC steps, including substeps and 
identified figures.
    (ii) Steps not labeled as RC may be deviated from using accepted 
methods in accordance with the operator's maintenance or inspection 
program without obtaining approval of an AMOC, provided the RC 
steps, including substeps and identified figures, can still be done 
as specified, and the airplane can be put back in an airworthy 
condition.

(l) Related Information

    For more information about this AD, contact Brandon Lucero, 
Aerospace Engineer, Cabin Safety and Environmental Systems Section, 
FAA, Seattle ACO Branch, 2200 South 216th St., Des Moines, WA 98198; 
phone and fax: 206-231-3569; email: Brandon.Lucero@faa.gov.

(m) 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 actions required by this AD, unless the AD specifies otherwise.
    (i) Boeing Special Attention Service Bulletin 747-25-3644, 
Revision 1, dated July 17, 2018.
    (ii) Boeing Special Attention Service Bulletin 747-25-3653, 
Revision 1, dated October 19, 2018.
    (3) For service information identified in this AD, contact 
Boeing Commercial Airplanes, Attention: Contractual & Data Services 
(C&DS), 2600 Westminster Blvd., MC 110-SK57, Seal Beach, CA 90740-
5600; telephone 562-797-1717; internet https://www.myboeingfleet.com.
    (4) You may view this service information at the FAA, Transport 
Standards Branch, 2200 South 216th St., Des Moines, WA. For 
information on the availability of this material at the FAA, call 
206-231-3195.
    (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, email fedreg.legal@nara.gov, or go to: https://www.archives.gov/federal-register/cfr/ibr-locations.html.

    Issued in Des Moines, Washington, on November 20, 2019.
Dorr Anderson,
Acting Director, System Oversight Division, Aircraft Certification 
Service.
[FR Doc. 2019-26708 Filed 12-11-19; 8:45 am]
 BILLING CODE 4910-13-P