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Federal Register / Vol. 86, No. 37 / Friday, February 26, 2021 / Proposed Rules Costs of Compliance The FAA estimates that this proposed AD affects 500 airplanes of U.S. registry.
The FAA estimates the following costs to comply with this proposed AD:
The FAA has determined that revising the existing maintenance or inspection program takes an average of 90 workhours per operator, although the agency recognizes that this number may vary from operator to operator. Since operators incorporate maintenance or inspection program changes for their affected fleets, the FAA has determined that a per-operator estimate is more accurate than a per-airplane estimate. Therefore, the FAA estimates the average total cost per operator to be $7,650 90 work-hours $85 per workhour.
Authority for This Rulemaking Title 49 of the United States Code specifies the FAAs 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 Agencys 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.

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Regulatory Findings The FAA 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 this proposed regulation:
1 Is not a significant regulatory action under Executive Order 12866, 2 Would not affect intrastate aviation in Alaska, and 3 Would not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act.

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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 39AIRWORTHINESS
DIRECTIVES
1. The authority citation for part 39
continues to read as follows:

Authority: 49 U.S.C. 106g, 40113, 44701.
39.13

Amended
2. The FAA amends 39.13 by adding the following new airworthiness directive:

The Boeing Company: Docket No. FAA
20210099; Project Identifier AD2020
01272T.
a Comments Due Date The FAA must receive comments on this airworthiness directive AD action by April 12, 2021.
b Affected ADs This AD affects the ADs specified in paragraphs b1 through 7 of this AD.
1 AD 20081101 R1, Amendment 39
16145 74 FR 68515, December 28, 2009 AD
20081101 R1.
2 AD 20100610, Amendment 3916234
75 FR 15322, March 29, 2010 AD 201006
10.
3 AD 20112505, Amendment 3916881
77 FR 2442, January 18, 2012 AD 201125
05.
4 AD 20132502, Amendment 3917698
79 FR 24541, May 1, 2014 AD 201325
02.
5 AD 20140809, Amendment 3917833
79 FR 24546, May 1, 2014 AD 201408
09.
6 AD 20142002, Amendment 3917975
79 FR 59102, October 1, 2014 AD 201420
02.
7 AD 20182013, Amendment 3919447
83 FR 52305, October 17, 2018 AD 2018
2013.
c Applicability This AD applies to The Boeing Company Model 767200, 300, 300F, and 400ER
series airplanes, certificated in any category, having line numbers L/N 1 through 1200
inclusive.
d Subject Air Transport Association ATA of America Code 28, Fuel.
e Unsafe Condition This AD was prompted by significant changes made to the airworthiness limitations AWLs related to fuel tank ignition prevention and the nitrogen generation system. The FAA is issuing this AD to address the potential for ignition
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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.
f Compliance Comply with this AD within the compliance times specified, unless already done.
g Maintenance or Inspection Program Revision Within 60 days after the effective date of this AD, revise the existing maintenance or inspection program, as applicable, to incorporate the information in Section A, including Subsections A.1, A.2, A.3, A.4, and A.5, of Boeing 767200/300/300F/400ER
Special Compliance Items/Airworthiness Limitations, D622T001904, revision January 2020; except as provided by paragraph h of this AD. The initial compliance times for the airworthiness limitation instructions ALI tasks are within the applicable compliance times specified in paragraphs g1 through 14 of this AD:
1 For AWL No. 28AWL01, External Wires Over Auxiliary Center Fuel Tank:
Within 144 months after the most recent inspection was performed as specified in AWL No. 28 AWL 01, or within 12 months after the effective date of this AD if no initial inspection has been performed or the last inspection date is unknown.
2 For AWL No. 28AWL05, Lightning ProtectionHydraulic Line Fuel Tank Penetration Bonding Path: Within 25,000
flight hours or 72 months, whichever occurs first, since the most recent inspection was performed as specified in AWL No. 28
AWL05, or within 30 days after the effective date of this AD if no initial inspection has been performed or the last inspection date is unknown.
3 For AWL No. 28AWL18, Fuel Quantity Indicating System FQISOut of Tank Wiring Lightning Shield to Ground Termination: Within 144 months after the most recent inspection was performed as specified in AWL No. 28AWL18, or within 12 months after the effective date of this AD
if no initial inspection has been performed or the last inspection date is unknown.
4 For AWL No. 28AWL20, Auxiliary Center Tank Override Fuel Pumps Auto Shutoff Circuit: Within 12 months after the most recent inspection was performed as specified in AWL No. 28AWL20; or within 12 months after accomplishment of the actions specified in Boeing Service Bulletin 76728A0083, or Boeing Service Bulletin 76728A0084, as applicable; whichever is later. If no initial inspection was performed or the last inspection date is unknown, then within 30 days after the effective date of this AD.
5 For AWL No. 28AWL21, AC and DC
Fuel Pump Fault Current Bonding Jumper Installation: Within 72 months after the most recent inspection was performed as specified in AWL No. 28AWL21, or within 6 months after the effective date of this AD
if no initial inspection has been performed or the last inspection date is unknown.

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