43454 Federal Register / Vol. 86, No. 150 / Monday, August 9, 2021 / Proposed Rules 

International Validation Branch, FAA, 2200 

South 216th St., Des Moines, WA 98198; 

telephone and fax 206–231–3220; email 

shahram.daneshmandi@faa.gov. 

Issued on July 29, 2021. 

Lance T. Gant, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2021–16558 Filed 8–6–21; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2021–0543; Project 

Identifier AD–2021–00353–T] 

RIN 2120–AA64 

Airworthiness Directives; The Boeing 

Company Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: The FAA proposes to adopt a 

new airworthiness directive (AD) for 

certain The Boeing Company Model 

737–200 and –200C series airplanes. 

This proposed 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. This proposed AD would 

require inspecting the AOA sensors for 

certain part numbers or vane shapes, 

and replacing any affected AOA sensor 

with a new or serviceable sensor. The 

FAA is proposing this AD to address the 

unsafe condition on these products. 

DATES: The FAA must receive comments 

on this proposed AD by September 23, 

2021. 

ADDRESSES: You may send comments, 

using the procedures found in 14 CFR 

11.43 and 11.45, by any of the following 

methods: 

• Federal eRulemaking Portal: Go to 

https://www.regulations.gov. Follow the 

instructions for submitting comments. 

• Fax: 202–493–2251. 

• Mail: U.S. Department of 

Transportation, Docket Operations, 

M–30, West Building Ground Floor, 

Room W12–140, 1200 New Jersey 

Avenue SE, Washington, DC 20590. 

• Hand Delivery: Deliver to Mail 

address above between 9 a.m. and 5 

p.m., Monday through Friday, except 

Federal holidays. 

For service information identified in 

this NPRM, 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 referenced service information at 

the FAA, Airworthiness Products 

Section, Operational Safety 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 at https://

www.regulations.gov by searching for 

and locating Docket No. FAA–2021– 

0543. 

Examining the AD Docket 

You may examine the AD docket at 

https://www.regulations.gov by 

searching for and locating Docket No. 

FAA–2021–0543; 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 

NPRM, any comments received, and 

other information. The street address for 

Docket Operations is listed above. 

FOR FURTHER INFORMATION CONTACT: 

Jeffrey W. Palmer, Aerospace Engineer, 

Systems and Equipment Section, FAA, 

Los Angeles ACO Branch, 3960 

Paramount Boulevard, Lakewood, CA 

90712–4137; phone: 562–627–5351; fax: 

562–627–5210; email: jeffrey.w.palmer@

faa.gov. 

SUPPLEMENTARY INFORMATION: 

Comments Invited 

The FAA invites you to send any 

written relevant data, views, or 

arguments about this proposal. Send 

your comments to an address listed 

under ADDRESSES. Include ‘‘Docket No. 

FAA–2021–0543; Project Identifier AD– 

2021–00353–T’’ at the beginning of your 

comments. The most helpful comments 

reference a specific portion of the 

proposal, explain the reason for any 

recommended change, and include 

supporting data. The FAA will consider 

all comments received by the closing 

date and may amend this proposal 

because of those comments. 

Except for Confidential Business 

Information (CBI) as described in the 

following paragraph, and other 

information as described in 14 CFR 

11.35, the FAA will post all comments 

received, without change, to https://

www.regulations.gov, including any 

personal information you provide. The 

agency will also post a report 

summarizing each substantive verbal 

contact received about this NPRM. 

Confidential Business Information 

CBI is commercial or financial 

information that is both customarily and 

actually treated as private by its owner. 

Under the Freedom of Information Act 

(FOIA) (5 U.S.C. 552), CBI is exempt 

from public disclosure. If your 

comments responsive to this NPRM 

contain commercial or financial 

information that is customarily treated 

as private, that you actually treat as 

private, and that is relevant or 

responsive to this NPRM, it is important 

that you clearly designate the submitted 

comments as CBI. Please mark each 

page of your submission containing CBI 

as ‘‘PROPIN.’’ The FAA will treat such 

marked submissions as confidential 

under the FOIA, and they will not be 

placed in the public docket of this 

NPRM. Submissions containing CBI 

should be sent to Jeffrey W. Palmer, 

Aerospace Engineer, Systems and 

Equipment Section, FAA, Los Angeles 

ACO Branch, 3960 Paramount 

Boulevard, Lakewood, CA 90712–4137; 

phone: 562–627–5351; fax: 562–627– 

5210; email: jeffrey.w.palmer@faa.gov. 

Any commentary that the FAA receives 

which is not specifically designated as 

CBI will be placed in the public docket 

for this rulemaking. 

Background 

The FAA has received 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 AOA sensor vanes had frozen and 

malfunctioned due to insufficient heat 

in certain AOA sensors to prevent ice 

buildup. This condition could be caused 

by heavy moisture conditions on the 

ground, leading to water entering the 

AOA vane pivot and freezing prior to or 

during flight. It was determined that the 

potential for AOA vane pivot freezing 

exists on certain AOA sensors having 

part numbers used on Model 737–200 

airplanes. This condition, if not 

addressed, could result in the AOA 

sensor vanes 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. 

FAA’s Determination 

The FAA is issuing this NPRM after 

determining that the unsafe condition 

described previously is likely to exist or 

develop on other products of the same 

type design. 

Related Service Information Under 1 

CFR Part 51 

The FAA reviewed Boeing Alert 

Service Bulletin 737–27A1324, dated 


lotter on DSK11XQN23PROD with PROPOSALS1
Federal Register / Vol. 86, No. 150 / Monday, August 9, 2021 / Proposed Rules 43455 

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 737–27A1324, 

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. FAA–2021– 

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 Parts cost Cost per 

product 

Cost on U.S. 

operators 

Inspection ............................... 1 work-hour × $85 per hour = $85 ......................................... $0 $85 $935 

The FAA estimates the following 

costs to do any necessary replacements 

that would be required based on the 

results of the proposed inspection. The 

agency has no way of determining the 

number of aircraft that might need these 

replacements: 

ON-CONDITION COSTS

Action Labor cost Parts cost Cost per 

product 

Replacement .................................... 3 work-hours × $85 per hour = $255 ........................................................ $54,000 $54,255 

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. 

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. 

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 39—AIRWORTHINESS 

DIRECTIVES 

■ 1. The authority citation for part 39 

continues to read as follows: 

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

§ 39.13 [Amended] 

■ 2. The FAA amends § 39.13 by adding 

the following new airworthiness 

directive: 

The Boeing Company: Docket No. FAA– 

2021–0543; Project Identifier AD–2021– 

00353–T. 

(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 737–200 and –200C series airplanes, 

certificated in any category, as identified in 

Boeing Alert Service Bulletin 737–27A1324, 

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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43456 Federal Register / Vol. 86, No. 150 / Monday, August 9, 2021 / Proposed Rules 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Required Actions for Group 2 Airplanes 

For airplanes identified as Group 2 in 

Boeing Alert Service Bulletin 737–27A1324, 

dated March 2, 2021: Within 120 days after 

the effective date of this AD, inspect the AOA 

sensor, using a method approved in 

accordance with the procedures specified in 

paragraph (j) of this AD. 

(h) Required Actions for Group 1 Airplanes 

Except as specified in paragraph (i) of this 

AD: At the applicable times specified in 

paragraph 1.E., ‘‘Compliance,’’ of Boeing 

Alert Service Bulletin 737–27A1324, dated 

March 2, 2021, do all applicable actions 

identified as ‘‘RC’’ (required for compliance) 

in, and in accordance with, the 

Accomplishment Instructions of Boeing Alert 

Service Bulletin 737–27A1324, dated March 

2, 2021. 

(i) Exception to Service Information 

Specifications 

Where Boeing Alert Service Bulletin 737– 

27A1324, dated March 2, 2021, uses the 

phrase ‘‘the original issue date of this service 

bulletin,’’ this AD requires using ‘‘the 

effective date of this AD.’’ 

(j) 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 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 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. 

(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, Los Angeles 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) For service information that contains 

steps that are labeled as Required for 

Compliance (RC), the provisions of 

paragraphs (j)(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. 

(k) Related Information 

(1) For more information about this AD, 

contact Jeffrey W. Palmer, Aerospace 

Engineer, Systems and Equipment Section, 

FAA, Los Angeles ACO Branch, 3960 

Paramount Boulevard, Lakewood, CA 90712– 

4137; phone: 562–627–5351; fax: 562–627– 

5210; email: jeffrey.w.palmer@faa.gov. 

(2) 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. You may view this 

referenced service information at the FAA, 

Airworthiness Products Section, Operational 

Safety Branch, 2200 South 216th St., Des 

Moines, WA. For information on the 

availability of this material at the FAA, call 

206–231–3195. 

Issued on June 28, 2021. 

Lance T. Gant, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2021–16679 Filed 8–6–21; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 71 

[Docket No. FAA–2021–0557; Airspace 

Docket No. 21–AWP–2] 

RIN 2120–AA66 

Proposed Establishment of Class E 

Airspace; Rogers Field, CA 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: This action proposes to 

establish Class E airspace extending 

upward from 700 feet above the surface 

of the earth at Rogers Field, Chester, CA. 

This action would accommodate a new 

area navigation (RNAV) procedure and 

ensure the safety and management of 

instrument flight rule (IFR) operations 

within the National Airspace System. 

DATES: Comments must be received on 

or before September 23, 2021. 

ADDRESSES: Send comments on this 

proposal to the U.S. Department of 

Transportation, Docket Operations, 1200 

New Jersey Avenue SE, West Building 

Ground Floor, Room W12–140, 

Washington, DC 20590; telephone: 1– 

800–647–5527, or (202) 366–9826. You 

must identify FAA Docket No. FAA– 

2021–0557; Airspace Docket No. 21– 

AWP–2, at the beginning of your 

comments. You may also submit 

comments through the internet at 

https://www.regulations.gov. 

FAA Order 7400.11E, Airspace 

Designations and Reporting Points, and 

subsequent amendments can be viewed 

online at https://www.faa.gov/air_

traffic/publications/. For further 

information, you can contact the 

Airspace Policy Group, Federal Aviation 

Administration, 800 Independence 

Avenue SW, Washington, DC 20591; 

telephone: (202) 267–8783. The Order is 

also available for inspection at the 

National Archives and Records 

Administration (NARA). For 

information on the availability of FAA 

Order 7400.11E at NARA, email: 

fr.inspection@nara.gov, or go to https:// 

www.archives.gov/federal-register/cfr/ 

ibr-locations.html. 

FOR FURTHER INFORMATION CONTACT: 

Richard Roberts, Federal Aviation 

Administration, Western Service Center, 

Operations Support Group, 2200 S. 

216th Street, Des Moines, WA 98198; 

telephone (206) 231–2245. 

SUPPLEMENTARY INFORMATION: 

Authority for This Rulemaking 

The FAA’s authority to issue rules 

regarding aviation safety is found in 

Title 49 of the United States Code. 

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. This rulemaking is 

promulgated under the authority 

described in Subtitle VII, Part A, 

Subpart I, Section 40103. Under that 

section, the FAA is charged with 

prescribing regulations to assign the use 

of airspace necessary to ensure the 

safety of aircraft and the efficient use of 

airspace. This regulation is within the 

scope of that authority as it would 

establish Class E airspace extending 

upward from 700 feet above the surface 

of the earth to support IFR operations at 

Rogers Field, Chester, CA. 

Comments Invited 

Interested parties are invited to 

participate in this proposed rulemaking 

by submitting such written data, views, 

or arguments, as they may desire. 

Comments that provide the factual basis 

supporting the views and suggestions 

presented are particularly helpful in 

developing reasoned regulatory 

decisions on the proposal. Comments 

are specifically invited on the overall 


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