87314 Federal Register / Vol. 89, No. 212 / Friday, November 1, 2024 / Proposed Rules 

(j) Additional Information 

For more information about this AD, 

contact Shahram Daneshmandi, Aviation 

Safety Engineer, FAA, 1600 Stewart Avenue, 

Suite 410, Westbury, NY 11590; phone: 206– 

231–3220; email: shahram.daneshmandi@

faa.gov. 

(k) Material Incorporated by Reference 

(1) The Director of the Federal Register 

approved the incorporation by reference of 

the material listed in this paragraph under 5 

U.S.C. 552(a) and 1 CFR part 51. 

(2) You must use this material as 

applicable to do the actions required by this 

AD, unless this AD specifies otherwise. 

(i) European Union Aviation Safety Agency 

(EASA) AD 2024–0171, dated August 27, 

2024. 

(ii) [Reserved] 

(3) For EASA material identified in this 

AD, contact EASA, Konrad-Adenauer-Ufer 3, 

50668 Cologne, Germany; telephone +49 221 

8999 000; email ADs@easa.europa.eu; 

website easa.europa.eu. You may find this 

material on the EASA website at 

ad.easa.europa.eu. 

(4) You may view this material 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. 

(5) You may view this material at the 

National Archives and Records 

Administration (NARA). For information on 

the availability of this material at NARA, 

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

ibr-locations or email fr.inspection@nara.gov. 

Issued on October 28, 2024. 

Victor Wicklund, 

Deputy Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2024–25368 Filed 10–31–24; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2024–2418; Project 

Identifier MCAI–2024–00239–T] 

RIN 2120–AA64 

Airworthiness Directives; ATR—GIE 

Avions de Transport Re ́gional 

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 ATR—GIE Avions de Transport 

Re ́gional Model ATR42 and ATR72 

airplanes. This proposed AD was 

prompted by a report that a flight deck 

emergency escape hatch was difficult to 

open due to the hose ends being 

connected to the hatch with incorrect 

parts, which could affect drainage of the 

hatch. This proposed AD would require 

inspection of the flight deck emergency 

escape hatch drain hose for 

discrepancies and applicable corrective 

actions, and prohibit accomplishment of 

maintenance actions using the 

instructions of certain maintenance 

tasks, as specified in a European Union 

Aviation Safety Agency (EASA) AD, 

which is proposed for incorporation by 

reference (IBR). 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 December 16, 

2024. 

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 

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. 

AD Docket: You may examine the AD 

docket at regulations.gov under Docket 

No. FAA–2024–2418; 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, the mandatory 

continuing airworthiness information 

(MCAI), any comments received, and 

other information. The street address for 

Docket Operations is listed above. 

Material Incorporated by Reference: 

• For EASA material identified in this 

proposed AD, contact EASA, KonradAdenauer-Ufer 3, 50668 Cologne, 

Germany; telephone +49 221 8999 000; 

email ADs@easa.europa.eu; website 

easa.europa.eu. You may find this 

material on the EASA website at 

ad.easa.europa.eu. It is also available at 

regulations.gov under Docket No. FAA– 

2024–2418. 

• You may view this material 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. 

FOR FURTHER INFORMATION CONTACT: 

Shahram Daneshmandi, Aviation Safety 

Engineer, FAA, 1600 Stewart Avenue, 

Suite 410, Westbury, NY 11590; 

telephone 206–231–3220; email: 

Shahram.Daneshmandi@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 the ADDRESSES section. Include 

‘‘Docket No. FAA–2024–2418; Project 

Identifier MCAI–2024–00239–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 

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 Shahram 

Daneshmandi, Aviation Safety Engineer, 

FAA, 1600 Stewart Avenue, Suite 410, 

Westbury, NY 11590; telephone 206– 

231–3220; email: 

Shahram.Daneshmandi@faa.gov. Any 

commentary that the FAA receives that 

is not specifically designated as CBI will 

be placed in the public docket for this 

rulemaking. 

Background 

EASA, which is the Technical Agent 

for the Member States of the European 

Union, has issued EASA AD 2024–0090, 

dated April 16, 2024 (also referred to as 


khammond on DSKJM1Z7X2PROD with PROPOSALS
Federal Register / Vol. 89, No. 212 / Friday, November 1, 2024 / Proposed Rules 87315 

the MCAI), to correct an unsafe 

condition for certain ATR—GIE Avions 

de Transport Re ́gional Model ATR42– 

200, ATR42–300, ATR42–320, ATR42– 

400, ATR42–500, ATR72–101, ATR72– 

102, ATR72–201, ATR72–202, ATR72– 

211, ATR72–212, and ATR72–212A 

airplanes. Model ATR42–400 airplanes 

are not certificated by the FAA and are 

not included on the U.S. type certificate 

data sheet; this proposed AD therefore 

does not include those airplanes in the 

applicability. 

The MCAI states that following a 

report that a flight deck emergency 

escape hatch was difficult to open, an 

ATR investigation revealed hatch drain 

hose ends connected to the hatch with 

incorrect parts (zip-tie and ty-rap) and 

installed collars with a too-small 

diameter that would not permit the 

drain hose to slide inside. These 

installation nonconformities could 

occur only during maintenance and 

could affect the hatch drainage and 

possibly result in difficulties in 

removing the hatch in case of an 

emergency evacuation. ATR has 

updated the maintenance procedures to 

clarify the correct procedures. 

The FAA is proposing this AD to 

address these installation 

nonconformities, which could prevent 

flightcrew evacuation from the airplane 

in case of an emergency, possibly 

resulting in personal injury. 

You may examine the MCAI in the 

AD docket at regulations.gov under 

Docket No. FAA–2024–2418. 

Material Incorporated by Reference 

Under 1 CFR Part 51 

EASA AD 2024–0090 specifies 

procedures for inspecting for 

discrepancies of the flight deck 

emergency escape hatch drain hose 

(including checking for the presence of 

a fastening system on the drain hoses at 

the level of the escape hatch drains and 

checking whether a drain hose slides 

freely in the clamp (collar)). 

Discrepancies include any zip-tie/ty-rap 

that is detected and any drain hose that 

does not slide freely in the clamp. 

Corrective actions include removing the 

fastening system and replacing the 

clamp. EASA AD 2024–0090 also 

prohibits accomplishment of 

maintenance actions using the 

instructions of Maintenance Procedure 

(MP) Tasks ATR–A–52–22–XX–00ZZZ– 

520Z–A and ATR–A–52–22–XX– 

00ZZZ–720Z–A issued December 31, 

2023, or earlier. This material is 

reasonably available because the 

interested parties have access to it 

through their normal course of business 

or by the means identified in the 

ADDRESSES section. 

FAA’s Determination 

This product has been approved by 

the aviation authority of another 

country and is approved for operation in 

the United States. Pursuant to the FAA’s 

bilateral agreement with this State of 

Design Authority, it has notified the 

FAA of the unsafe condition described 

in the MCAI referenced above. The FAA 

is issuing this NPRM after determining 

that the unsafe condition described 

previously is likely to exist or develop 

in other products of the same type 

design. 

Proposed AD Requirements in This 

NPRM 

This proposed AD would require 

accomplishing the actions specified in 

EASA AD 2024–0090 described 

previously, except for any differences 

identified as exceptions in the 

regulatory text of this proposed AD. 

Explanation of Required Compliance 

Information 

In the FAA’s ongoing efforts to 

improve the efficiency of the AD 

process, the FAA developed a process to 

use some civil aviation authority (CAA) 

ADs as the primary source of 

information for compliance with 

requirements for corresponding FAA 

ADs. The FAA has been coordinating 

this process with manufacturers and 

CAAs. As a result, the FAA proposes to 

incorporate EASA AD 2024–0090 by 

reference in the FAA final rule. This 

proposed AD would, therefore, require 

compliance with EASA AD 2024–0090 

in its entirety through that 

incorporation, except for any differences 

identified as exceptions in the 

regulatory text of this proposed AD. 

Using common terms that are the same 

as the heading of a particular section in 

EASA AD 2024–0090 does not mean 

that operators need comply only with 

that section. For example, where the AD 

requirement refers to ‘‘all required 

actions and compliance times,’’ 

compliance with this AD requirement is 

not limited to the section titled 

‘‘Required Action(s) and Compliance 

Time(s)’’ in EASA AD 2024–0090. 

Material required by EASA AD 2024– 

0090 for compliance will be available at 

regulations.gov under Docket No. FAA– 

2024–2418 after the FAA final rule is 

published. 

Costs of Compliance 

The FAA estimates that this AD, if 

adopted as proposed, would affect 80 

airplanes of U.S. registry. The FAA 

estimates the following costs to comply 

with this proposed AD: 

ESTIMATED COSTS FOR REQUIRED ACTIONS

Labor cost Parts cost Cost per 

product 

Cost on U.S. 

operators 

0.25 work-hour × $85 per hour = $21.25 .................................................................................... $0 $21.25 $1,700 

The FAA estimates the following 

costs to do any replacement that would 

be required based on the results of any 

required actions. The FAA has no way 

of determining the number of aircraft 

that might need this replacement: 

ESTIMATED COSTS OF ON-CONDITION ACTIONS

Labor cost Parts cost Cost per 

product 

0.25 work-hour × $85 per hour = $21.25 ................................................................................................................ Minimal $21.25 

The FAA has included all known 

costs in its cost estimate. According to 

the manufacturer, however, some or all 

of the costs of this proposed AD may be 

covered under warranty, thereby 

reducing the cost impact on affected 

operators. 


khammond on DSKJM1Z7X2PROD with PROPOSALS
87316 Federal Register / Vol. 89, No. 212 / Friday, November 1, 2024 / Proposed Rules 

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: 

ATR—GIE Avions de Transport Re ́gional; 

Docket No. FAA–2024–2418; Project 

Identifier MCAI–2024–00239–T. 

(a) Comments Due Date 

The FAA must receive comments on this 

airworthiness directive (AD) by December 16, 

2024. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to the ATR—GIE Avions 

de Transport Re ́gional airplanes, certificated 

in any category, specified in paragraphs (c)(1) 

and (2) of this AD and identified in European 

Union Aviation Safety Agency (EASA) AD 

2024–0090, dated April 16, 2024 (EASA AD 

2024–0090). 

(1) Model ATR42–200, –300, –320, and 

–500 airplanes. 

(2) Model ATR72–101, –102, –201, –202, 

–211, –212, and –212A airplanes. 

(d) Subject 

Air Transport Association (ATA) of 

America Code 52, Doors. 

(e) Unsafe Condition 

This AD was prompted by a report that a 

flight deck emergency escape hatch was 

difficult to open due to the hose ends being 

connected to the hatch with incorrect parts 

or and installed collars with a too-small 

diameter that would not permit the drain 

hose to slide inside. The FAA is issuing this 

AD to address such installation 

nonconformities, which could affect drainage 

of the hatch. The unsafe condition, if not 

addressed, could prevent flightcrew 

evacuation in case of an emergency, possibly 

resulting in personal injury. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Requirements 

Except as specified in paragraphs (h) and 

(i) of this AD: Comply with all required 

actions and compliance times specified in, 

and in accordance with, EASA AD 2024– 

0090. 

(h) Exceptions to EASA AD 2024–0090 

(1) Where EASA AD 2024–0090 refers to its 

effective date, this AD requires using the 

effective date of this AD. 

(2) This AD does not adopt the ‘‘Remarks’’ 

section of EASA AD 2024–0090. 

(3) Where EASA AD 2024–0090 states ‘‘any 

discrepancy, as defined in the AOM, is 

detected’’ for this AD replace that text with 

‘‘any fastening system (e.g., zip-tie/ty-rap) is 

detected or any drain hose does not slide 

freely in the clamp (collar).’’ 

(i) No Reporting 

Although the material referenced in EASA 

AD 2024–0090 specifies to submit certain 

information to the manufacturer, this AD 

does not include that requirement. 

(j) Additional AD Provisions 

The following provisions also apply to this 

AD: 

(1) Alternative Methods of Compliance 

(AMOCs): The Manager, International 

Validation 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 International Validation 

Branch, send it to the attention of the person 

identified in paragraph (k) of this AD and 

email to: AMOC@faa.gov. Before using any 

approved AMOC, notify your appropriate 

principal inspector, or lacking a principal 

inspector, the manager of the responsible 

Flight Standards Office. 

(2) Contacting the Manufacturer: For any 

requirement in this AD to obtain instructions 

from a manufacturer, the instructions must 

be accomplished using a method approved 

by the Manager, International Validation 

Branch, FAA; or EASA; or ATR—GIE Avions 

de Transport Re ́gional’s EASA Design 

Organization Approval (DOA). If approved by 

the DOA, the approval must include the 

DOA-authorized signature. 

(k) Additional Information 

For more information about this AD, 

contact Shahram Daneshmandi, Aviation 

Safety Engineer, FAA, 1600 Stewart Avenue, 

Suite 410, Westbury, NY 11590; telephone 

206–231–3220; email: 

shahram.daneshmandi@faa.gov. 

(l) Material Incorporated by Reference 

(1) The Director of the Federal Register 

approved the incorporation by reference of 

the material listed in this paragraph under 5 

U.S.C. 552(a) and 1 CFR part 51. 

(2) You must use this material as 

applicable to do the actions required by this 

AD, unless this AD specifies otherwise. 

(i) European Union Aviation Safety Agency 

(EASA) AD 2024–0090, dated April 16, 2024. 

(ii) [Reserved] 

(3) For EASA material identified in this 

AD, contact EASA, Konrad-Adenauer-Ufer 3, 

50668 Cologne, Germany; telephone +49 221 

8999 000; email ADs@easa.europa.eu; 

website easa.europa.eu. You may find this 

material on the EASA website at 

ad.easa.europa.eu. 

(4) You may view this material 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. 

(5) You may view this material at the 

National Archives and Records 

Administration (NARA). For information on 

the availability of this material at NARA, 

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

ibr-locations or email fr.inspection@nara.gov. 


khammond on DSKJM1Z7X2PROD with PROPOSALS
Federal Register / Vol. 89, No. 212 / Friday, November 1, 2024 / Proposed Rules 87317 

Issued on October 28, 2024. 

Victor Wicklund, 

Deputy Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2024–25369 Filed 10–31–24; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2024–2417; Project 

Identifier AD–2024–00336–E] 

RIN 2120–AA64 

Airworthiness Directives; General 

Electric Company Engines 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: The FAA proposes to 

supersede Airworthiness Directive (AD) 

2020–20–17 and AD 2021–15–05, which 

apply to all General Electric Company 

(GE) Model GE90–110B1 and GE90– 

115B engines. AD 2020–20–17 prohibits 

dispatch of an airplane if certain status 

messages are displayed on the engine 

indicating and crew alerting system 

(EICAS) and if certain conditions are 

present; and as terminating action, 

requires revision of the existing FAAapproved minimum equipment list 

(MEL) by incorporating the dispatch 

restrictions into the MEL. AD 2021–15– 

05 requires initial and repetitive 

replacement of the full authority digital 

engine control (FADEC) integrated 

circuit (MN4) microprocessor. Since the 

FAA issued AD 2020–20–17 and AD 

2021–15–05, the manufacturer has 

developed a software revision for the 

electronic engine control (EEC) FADEC 

that further mitigates the unsafe 

condition. This proposed AD would 

retain all the actions of AD 2020–20–17 

and AD 2021–15–05, and it would also 

require upgrading the EEC FADEC 

software to an EEC FADEC software 

version eligible for installation as a 

terminating action. 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 December 16, 

2024. 

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 

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. 

AD Docket: You may examine the AD 

docket at regulations.gov under Docket 

No. FAA–2024–2417; 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. 

Material Incorporated by Reference: 

• For GE material identified in this 

proposed AD, contact GE, 1 Neumann 

Way, Cincinnati, OH 45215; phone: 

(513) 552–3272; email: 

aviation.fleetsupport@ge.com; website: 

ge.com. 

• You may view this material 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 (817) 222– 

5110. 

FOR FURTHER INFORMATION CONTACT: 

Alexander Thickstun, Aviation Safety 

Engineer, FAA, 2200 South 216th Street, 

Des Moines, WA 98198; phone: (202) 

267–8292; email: 

alexander.m.thickstun@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 the ADDRESSES section. Include 

‘‘Docket No. FAA–2024–2417; Project 

Identifier AD–2024–00336–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 revise 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 

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 Alexander Thickstun, 

Aviation Safety Engineer, FAA, 2200 

South 216th Street, Des Moines, WA 

98198. 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 issued AD 2020–20–17, 

Amendment 39–21273 (85 FR 63443, 

October 8, 2020) (‘‘AD 2020–20–17’’) 

and AD 2021–15–05, Amendment 39– 

21652 (86 FR 43409, August 9, 2021) 

(‘‘AD 2021–15–05’’), for all GE Model 

GE90–110B1 and GE90–115B engines. 

AD 2020–20–17 was prompted by an 

in-service occurrence of loss of engine 

thrust control resulting in 

uncommanded high thrust. AD 2020– 

20–17 prohibits dispatch of an airplane 

if certain status messages are displayed 

on the EICAS and if certain conditions 

are present; and as terminating action, 

requires revision of the existing FAAapproved MEL by incorporating the 

dispatch restrictions listed in AD 2020– 

20–17 into the MEL. The agency issued 

AD 2020–20–17 to prevent dispatch of 

the airplane when certain faults caused 

by degradation of the MN4 integrated 

circuit in the FADEC are displayed and 

certain FADEC conditions are present 

which, if not addressed, could result in 

loss of engine thrust control and 

reduced control of the airplane. 

AD 2021–15–05 was also prompted by 

the in-service occurrence of loss of 

engine thrust control resulting in 

uncommanded high thrust. AD 2021– 

15–05 requires initial and repetitive 

replacement of the FADEC MN4 

microprocessor. The agency issued AD 

2021–15–05 to prevent failure of the 

FADEC MN4 microprocessor solder ball 

which, if not addressed, could result in 


khammond on DSKJM1Z7X2PROD with PROPOSALS