47264 Federal Register / Vol. 86, No. 161 / Tuesday, August 24, 2021 / Proposed Rules 

(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 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. 

(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) AMOCs approved for AD 2017–23–02 

are approved as AMOCs for the 

corresponding provisions of Boeing Alert 

Service Bulletin 737–53A1358, Revision 1, 

dated February 26, 2021, that are required by 

paragraph (h) of this AD. 

(5) Except as specified by paragraph (i)(2) 

of this AD: For service information that 

contains steps that are labeled as Required 

for Compliance (RC), the provisions of 

paragraphs (j)(5)(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 James Guo, Aerospace Engineer, 

Airframe Section, FAA, Los Angeles ACO 

Branch, 3960 Paramount Boulevard, 

Lakewood, CA 90712–4137; phone: 562–627– 

5357; fax: 562–627–5210; email: james.guo@

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 August 7, 2021. 

Gaetano A. Sciortino, 

Deputy Director for Strategic Initiatives, 

Compliance & Airworthiness Division,Aircraft 

Certification Service. 

[FR Doc. 2021–18068 Filed 8–23–21; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2021–0699; Project 

Identifier AD–2020–01685–E] 

RIN 2120–AA64 

Airworthiness Directives; General 

Electric Company Turbofan Engines 

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 General Electric Company (GE) 

CF34–10E model turbofan engines. This 

proposed AD was prompted by a 

manufacturer investigation that revealed 

Teflon material in the A-sump oil 

strainer (strainer assembly) screen after 

several reports of in-flight shutdowns 

(IFSDs) and unscheduled engine 

removals (UERs). This proposed AD 

would require initial and repetitive 

visual inspections of the strainer 

assembly screen. As a terminating 

action to the initial and repetitive visual 

inspections, this proposed AD would 

require the replacement of the stationary 

oil seal at the No. 1 forward bearing. 

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 October 8, 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 General Electric 

Company, GE Aviation, Room 285, 1 

Neumann Way, Cincinnati, OH 45215; 

phone: (513) 552–3272; email: 

aviation.fleetsupport@ae.ge.com; 

website: www.ge.com. You may view 

this service information at the FAA, 

Airworthiness Products Section, 

Operational Safety Branch, 1200 District 

Avenue, Burlington, MA 01803. For 

information on the availability of this 

material at the FAA, call (781) 238– 

7759. 

Examining the AD Docket 

You may examine the AD docket at 

https://www.regulations.gov by 

searching for and locating Docket No. 

FAA–2021–0699; 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: 

Scott Stevenson, Aviation Safety 

Engineer, ECO Branch, FAA, 1200 

District Avenue, Burlington, MA 01803; 

phone: (781) 238–7132; fax: (781) 238– 

7199; email: Scott.M.Stevenson@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–2021–0699; Project Identifier AD– 

2020–01685–E’’ 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 


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Federal Register / Vol. 86, No. 161 / Tuesday, August 24, 2021 / Proposed Rules 47265 

(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 Scott Stevenson, 

Aviation Safety Engineer, ECO Branch, 

FAA, 1200 District Avenue, Burlington, 

MA 01803. 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 received reports of several 

IFSDs and UERs on airplanes operating 

with GE CF34–10E5, CF34–10E5A1, 

CF34–10E6, and CF34–10E7 model 

turbofan engines. After investigation, 

the manufacturer determined that the 

failures were the result of Teflon oil 

seals disbonding from the aluminum 

housing when used with either high 

thermal stability (HTS) or high 

performance capability (HPC) oils. The 

stationary oil seal deterioration resulted 

from the failure of the bonding 

adhesive, known as EA9658, which 

does not have the high temperature 

capabilities as designed and is 

negatively impacted by the use of HTS 

or HPC oils. This deterioration results in 

Teflon particles collecting in the 

strainer assembly. The manufacturer 

determined that CF34–10E2A1, CF34– 

10E6A1, and CF34–10E7–B model 

turbofan engines are also subject to this 

unsafe condition. This condition, if not 

addressed, could result in failure of the 

engine, in-flight shutdown, and 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 GE CF34–10E 

Service Bulletin 72–0365 R04, dated 

April 27, 2021. This service information 

specifies procedures for performing a 

visual inspection and a borescope 

inspection of the strainer assembly for 

Teflon particles. 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 

initial and repetitive visual inspections 

of the strainer assembly screen. As a 

terminating action to the repetitive 

visual inspections, this proposed AD 

would require the replacement of the 

stationary oil seal at the No. 1 forward 

bearing. 

Costs of Compliance 

The FAA estimates that this AD, if 

adopted as proposed, would affect 46 

engines installed on 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 

Inspect the strainer assembly 

screen.

1 work-hour × $85 per hour = $85 ......................................... $0 $85 $3,910 

Replace the stationary oil seal 2 work-hours × $85 per hour = $170 ..................................... 8,628 8,798 404,708 

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: 

General Electric Company: Docket No. FAA– 

2021–0699; Project Identifier AD–2020– 

01685–E. 


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47266 Federal Register / Vol. 86, No. 161 / Tuesday, August 24, 2021 / Proposed Rules 

(a) Comments Due Date 

The FAA must receive comments on this 

airworthiness directive (AD) by October 8, 

2021. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to all General Electric 

Company (GE) CF34–10E2A1, CF34–10E5, 

CF34–10E5A1, CF34–10E6, CF34–10E6A1, 

CF34–10E7, and CF34–10E7–B model 

turbofan engines with a stationary oil seal, 

part number (P/N) B1316–00453 or P/N 

B1316–01274, installed at the No.1 forward 

bearing, that has used high thermal stability 

(HTS) oil or high performance capability 

(HPC) oil for 56 or more flight hours (FHs) 

during the life of the stationary oil seal. 

(d) Subject 

Joint Aircraft System Component (JASC) 

Code 7261, Turbine Engine Oil System. 

(e) Unsafe Condition 

This AD was prompted by investigation by 

the manufacturer that revealed Teflon 

material in the A-sump oil strainer (strainer 

assembly) screen after several reports of inflight shutdowns and unscheduled engine 

removals. The FAA is issuing this AD to 

prevent failure of the stationary oil seal at the 

No.1 forward bearing. The unsafe condition, 

if not addressed, could result in failure of the 

engine, in-flight shutdown, and loss of 

control of the airplane. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Required Actions 

(1) Within the compliance time specified 

in paragraph (g)(1)(i) or (ii) of this AD, as 

applicable, perform an initial visual 

inspection of the strainer assembly screen for 

Teflon material. Guidance on performing the 

visual inspections of the strainer assembly 

screen can be found in the Accomplishment 

Instructions, paragraphs 3.A.(1)(d), of GE 

CF34–10E Service Bulletin (SB) 72–0365 

R04, dated April 27, 2021. 

(i) For an affected stationary oil seal having 

fewer than 2,250 flight hours (FHs) since new 

on the effective date of this AD, perform the 

initial inspection of the strainer assembly 

screen at the next engine shop visit after 

accumulating 2,250 FHs since new, but no 

later than 2,350 FHs since new. 

(ii) For an affected stationary oil seal 

having 2,250 or more FHs since new on the 

effective date of this AD, perform the initial 

inspection of the strainer assembly screen 

within 100 FHs after the effective date of this 

AD. 

(2) Thereafter, within the following 

compliance times, repeat the visual 

inspection of the strainer assembly screen 

required by paragraph (g)(1) of this AD: 

(i) For an affected stationary oil seal having 

2,250 to 7,000 FHs since new at the time of 

the last inspection, repeat the visual 

inspection every 750 FHs. 

(ii) For an affected stationary oil seal 

having 7,001 to 10,000 FHs since new at the 

time of the last inspection, repeat the visual 

inspection every 375 FHs. 

(iii) For an affected stationary oil seal 

having more than 10,000 FHs since new at 

the time of the last inspection, repeat the 

visual inspection every 100 FHs. 

(3) If, based on the inspections required by 

paragraph (g)(1) or (2) of this AD, Teflon 

material is found in the strainer assembly 

screen, before further flight, remove the 

stationary oil seal at the No. 1 forward 

bearing from service and replace it with a 

part eligible for installation. 

(4) Before an affected stationary oil seal 

accumulates 10,000 FHs since new or within 

500 FHs after the effective date of this AD, 

whichever occurs later, remove the stationary 

oil seal at the No. 1 forward bearing from 

service and replace it with a part eligible for 

installation. 

(h) Terminating Action 

Removal of the stationary oil seal, P/N 

B1316–00453 or P/N B1316–01274, installed 

at the No. 1 forward bearing, and 

replacement with a part eligible for 

installation, constitutes terminating action 

for the initial and repetitive inspections 

required by paragraphs (g)(1) and (2) of this 

AD. 

(i) Definition 

For the purpose of this AD, a ‘‘part eligible 

for installation’’ is a stationary oil seal that 

has a P/N other than P/N B1316–00453 or P/ 

N B1316–01274. 

(j) Special Flight Permit 

Special flight permits, as described in 14 

CFR 21.197 and 21.199, are subject to the 

requirements of paragraph (j)(1) of this AD. 

(1) Operators who are prohibited from 

further flight due to Teflon material found in 

the strainer assembly screen may perform a 

non-revenue ferry flight, consisting of no 

more than five cycles, to a location where the 

engine can be removed from service if 

operators perform the actions in Appendix— 

A, paragraph 4.A., GE CF34–10E Service 

Bulletin (SB) 72–0365 R04, dated April 27, 

2021 and the engine still meets the criteria 

in paragraph 4.A. for flying an additional five 

cycles. This ferry flight must be performed 

with only essential flight crew, without 

passengers, and involve non-ETOPS 

operations. 

(2) [Reserved] 

(k) Alternative Methods of Compliance 

(AMOCs) 

(1) The Manager, ECO 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. You may 

email your request to ANE-AD-AMOC@

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. 

(l) Related Information 

(1) For more information about this AD, 

contact Scott Stevenson, Aviation Safety 

Engineer, ECO Branch, FAA, 1200 District 

Avenue, Burlington, MA 01803; phone: (781) 

238–7132; fax: (781) 238–7199; email: 

Scott.M.Stevenson@faa.gov. 

(2) For service information identified in 

this AD, contact General Electric Company, 

GE Aviation, Room 285, 1 Neumann Way, 

Cincinnati, OH 45215; phone: (513) 552– 

3272; email: aviation.fleetsupport@

ae.ge.com; website: www.ge.com. You may 

view this referenced service information at 

the FAA, Airworthiness Products Section, 

Operational Safety Branch, 1200 District 

Avenue, Burlington, MA 01803. For 

information on the availability of this 

material at the FAA, call (781) 238–7759. 

Issued on August 18, 2021. 

Ross Landes, 

Deputy Director for Regulatory Operations, 

Compliance & Airworthiness Division, 

Aircraft Certification Service. 

[FR Doc. 2021–18148 Filed 8–23–21; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 139 

[Docket No.: FAA–2010–0997; Notice No. 

16–04] 

RIN 2120–AJ38 

Safety Management System for 

Certificated Airports 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Supplemental notice of 

proposed rulemaking (SNPRM); 

reopening of comment period. 

SUMMARY: This action reopens the 

comment period for the Safety 

Management System for Certificated 

Airports SNPRM published July 14, 

2016. In the SNPRM, the FAA proposed 

to amend certain requirements included 

in the notice of proposed rulemaking 

published on October 7, 2010. Most 

notably, the FAA revised the proposed 

applicability of the rule so that a Safety 

Management System (SMS) is only 

required for a certificated airport 

classified as a small, medium, or large 

hub airport in the National Plan of 

Integrated Airport Systems; serving 

international air traffic; or having more 

than 100,000 total annual operations. 

The FAA also proposed changes that 

would extend the implementation 

period from 18 to 24 months; require 

submission of an implementation plan 

within 12 months instead of 6 months 

of the effective date of the final rule; 

modify the training requirements; 


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