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Federal Register / Vol. 86, No. 150 / Monday, August 9, 2021 / Proposed Rules March 2, 2021. This service information specifies procedures for doing a general visual inspection of the left and right side AOA sensor vane shape, or inspecting the left and right AOA
sensors to determine the part number, and replacing any affected AOA sensor with a new or serviceable sensor.
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 ADDRESSES.

Proposed AD Requirements in This NPRM
This proposed AD would require accomplishing the actions identified as RC required for compliance in the Accomplishment Instructions of Boeing Alert Service Bulletin 73727A1324, dated March 2, 2021, already described, except for any differences identified as exceptions in the regulatory text of this proposed AD. For information on the procedures and compliance times, see
this service information at https
www.regulations.gov by searching for and locating Docket No. FAA2021
0543.
Costs of Compliance The FAA estimates that this AD, if adopted as proposed, would affect 11
airplanes of U.S. registry. The FAA
estimates the following costs to comply with this proposed AD:

ESTIMATED COSTS
Action
Labor cost
Inspection

1 work-hour $85 per hour = $85

The FAA estimates the following costs to do any necessary replacements that would be required based on the
Cost per product
Parts cost
results of the proposed inspection. The agency has no way of determining the
$0

Cost on U.S.
operators
$85

$935

number of aircraft that might need these replacements:

ON-CONDITION COSTS
Action
Labor cost
Replacement

3 work-hours $85 per hour = $255

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
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16:39 Aug 06, 2021

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Parts cost
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.
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:

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$54,000

Cost per product $54,255

The Boeing Company: Docket No. FAA
20210543; Project Identifier AD2021
00353T.
a Comments Due Date The FAA must receive comments on this airworthiness directive AD by September 23, 2021.
b Affected ADs None.
c Applicability This AD applies to The Boeing Company Model 737200 and 200C series airplanes, certificated in any category, as identified in Boeing Alert Service Bulletin 73727A1324, dated March 2, 2021.
d Subject Air Transport Association ATA of America Code 27, Flight Control System.
e Unsafe Condition This AD was prompted by reports of nuisance stick shaker activation while the airplane was accelerating to cruise speed at the top of a climb. Investigation revealed the cause of the activation was the angle of attack AOA also known as angle of airflow sensor vanes had frozen and malfunctioned due to insufficient heat in certain AOA
sensors to prevent ice buildup. The FAA is issuing this AD to prevent the AOA sensor vanes from being immobilized, which could result in unreliable or inaccurate AOA sensor data being transmitted to airplane systems, and consequent loss of control of the airplane.

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