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Federal Register / Vol. 86, No. 94 / Tuesday, May 18, 2021 / Rules and Regulations ESTIMATED COSTS
Action
Labor cost
BITE test

1 work-hour $85 per hour = $85 per test

The FAA has received no definitive data on which to base the cost estimates for the on-condition corrective actions specified in this AD.
Authority for This Rulemaking
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, and 2 Will not affect intrastate aviation in Alaska.
List of Subjects in 14 CFR Part 39

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Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.

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

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Cost per product $0

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

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

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.

Adoption of the Amendment
Parts cost
39.13

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

20210814 The Boeing Company:
Amendment 3921508; Docket No.
FAA20210270; Project Identifier AD
202100352T.
a Effective Date This airworthiness directive AD is effective June 2, 2021.
b Affected ADs None.
c Applicability This AD applies to all The Boeing Company Model 737300, 400, and 500
series airplanes, certificated in any category.
d Subject Air Transport Association ATA of America Code 22, Auto flight.
e Unsafe Condition This AD was prompted by a flap synchro wire failure that may go undetected by the autothrottle A/T computer. The FAA is issuing this AD to address failure of the flap position sensor, which could result in failure of the asymmetric cruise thrust monitor to engage during a large thrust asymmetry event, and loss of control of the airplane.
f Compliance Comply with this AD within the compliance times specified, unless already done.
g BITE Test Within 250 flight hours or 2 months after the effective date of this AD, whichever occurs first: Perform the applicable A/T
computer BITE built-in test equipment test, A/T BITE TEST LRU INTERFACE, and before further flight do all applicable corrective actions, in accordance with paragraphs 1. through 5. of Boeing MultiOperator Message MOMMOM210145
01BR2, dated March 30, 2021, except as provided in paragraph h of this AD. Repeat the test thereafter at intervals not to exceed 2,000 flight hours.
h Clarification of Service Information Specifications Although paragraph 1. of Boeing MultiOperator Message MOMMOM210145
01BR2, dated March 30, 2021, specifies to
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$85 per test

Cost on U.S. operators $11,220 per test.

prepare the airplane for BITE testing using the reference/A/, AMM 220400 or 2204
10, paragraph 3 and 4 as necessary, this AD
does not require using that service information to accomplish those steps, but operators may refer to that information for guidance on the procedures.
i Reporting Although Boeing Multi-Operator Message MOMMOM21014501BR2, dated March 30, 2021, specifies to report test results, this AD does not require any report.
j Credit for Previous Actions This paragraph provides credit for the actions specified in paragraph g of this AD, if those actions were performed before the effective date of this AD using Boeing MultiOperator Message MOMMOM210145
01BR1, dated March 23, 2021.
k Alternative Methods of Compliance AMOCs 1 The Manager, Los Angeles 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 responsible Flight Standards Office, as appropriate. If sending information directly to the manager of the certification office, send it to the attention of the person identified in Related Information.
Information may be emailed to 9-ANMLAACO-AMOC-Requests@faa.gov.
2 Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the responsible Flight Standards Office.
l Related Information 1 For more information about this AD, contact Jeffrey Palmer, Aerospace Engineer, Systems and Equipment Section, FAA, Los Angeles ACO Branch, 3960 Paramount Boulevard, Lakewood, CA 907124137;
phone: 5626275351; email:
Jeffrey.W.Palmer@faa.gov.
2 Service information identified in this AD that is not incorporated by reference is available at the addresses specified in paragraphs m3 and 4 of this AD.
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. 552a 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 Multi-Operator Message MOM
MOM21014501BR2, dated March 30, 2021.
ii Reserved 3 For service information identified in this AD, contact Boeing Commercial
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