Federal Register / Vol. 89, No. 248 / Friday, December 27, 2024 / Proposed Rules 105485 

(4) If no indications are found during the 

FPI required by paragraph (g)(3) of this AD, 

within 15,000 part cycles from the date of the 

FPI, remove the CCA from service and 

replace with P/N 4180T27G07, 4180T27G08, 

or a later approved P/N, as applicable. 

(5) For affected Group 1 and 2 engines with 

an installed CCA having more than 25,000 

PCSN as of the effective date of this AD, at 

the next engine shop visit after the effective 

date of this AD, perform an FPI on the 

forward flange of the CCA for any 

indications. 

(6) If no indications are found during the 

FPI required by paragraph (g)(5) of this AD, 

within 15,000 part cycles from the date of the 

FPI and not to exceed 41,100 PCSN, remove 

the CCA from service and replace with P/N 

4180T27G07, 4180T27G08, or a later 

approved P/N, as applicable. 

(7) If an indication is found during any FPI 

required by paragraph (g)(3) or (5) of this AD, 

before further flight, remove the CCA from 

service and replace with P/N 4180T27G07, P/ 

N 4180T27G08, or a later approved P/N, as 

applicable. 

(h) Definitions 

For the purpose of this AD: 

(1) ‘‘Group 1 engines’’ are GE Model CF34– 

8C1, CF34–8C5, CF34–8C5A1, CF34–8C5A2, 

CF34–8C5A3, and CF34–8C5B1 engines. 

(2) ‘‘Group 2 engines’’ are GE Model CF34– 

8E2, CF34–8E2A1, CF34–8E5, CF34–8E5A1, 

CF34–8E5A2, CF34–8E6, and CF34–8E6A1 

engines. 

(3) An ‘‘engine shop visit’’ is the induction 

of an engine into the shop for maintenance 

involving the separation of major mating 

engine case flanges, except for the following 

situations, which do not constitute an engine 

shop visit: 

(i) Separation of engine flanges solely for 

the purposes of transportation of the engine 

without subsequent maintenance. 

(ii) Separation of engine flanges solely for 

the purposes of replacing the fan or 

propulsor without subsequent maintenance. 

(i) Installation Prohibition 

After the effective date of this AD, do not 

reinstall any CCAs that were removed as a 

result of paragraphs (g)(1), (2), (4), (6), and (7) 

of this AD in any engine. 

(j) Alternative Methods of Compliance 

(AMOCs) 

(1) The Manager, AIR–520 Continued 

Operational Safety 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 AIR–520 Continued 

Operational Safety Branch, send it to the 

attention of the person identified in 

paragraph (k) of this AD and email to: 

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. 

(k) Additional Information 

For more information about this AD, 

contact Alexei Marqueen, Aviation Safety 

Engineer, FAA, 2200 South 216th Street, Des 

Moines, WA 98198; phone: (781) 238–7178; 

email: alexei.t.marqueen@faa.gov. 

(l) Material Incorporated by Reference 

None. 

Issued on December 19, 2024. 

Suzanne Masterson, 

Deputy Director, Integrated Certificate 

Management Division, Aircraft Certification 

ervice. 

[FR Doc. 2024–30785 Filed 12–26–24; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2024–2713; Project 

Identifier AD–2024–00328–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 

777–200, –200LR, –300, –300ER, and 

777F series airplanes. This proposed AD 

was prompted by a report indicating 

that an airplane experienced a 

glideslope (G/S) beam anomaly during 

an instrument landing system (ILS) 

approach, which resulted in a higherthan-expected descent rate during the 

final segment of an ILS approach. The 

flightcrew might follow misleading 

flight director (F/D) guidance after 

disconnecting the autopilot, without 

reference to the other available 

information and flight deck indications. 

This proposed AD would require 

installing new autopilot flight director 

computer (AFDC) operational program 

software (OPS) and doing a software 

configuration check. 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 February 25, 

2025. 

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–2024–2713; 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 Boeing material identified in 

this proposed 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; website 

myboeingfleet.com. 

• 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. 

It is also available at regulations.gov 

under Docket No. FAA–2024–2713. 

FOR FURTHER INFORMATION CONTACT: 

Michael Closson, Aviation Safety 

Engineer, FAA, 2200 South 216th St., 

Des Moines, WA 98198; phone: 206– 

231–3973; email: Michael.P.Closson@

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–2024–2713; Project 

Identifier AD–2024–00328–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 


khammond on DSK9W7S144PROD with PROPOSALS
105486 Federal Register / Vol. 89, No. 248 / Friday, December 27, 2024 / Proposed Rules 

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 Michael Closson, 

Aviation Safety Engineer, FAA, 2200 

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

phone: 206–231–3973; email: 

Michael.P.Closson@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 

The FAA has received a report 

indicating that a Model 787–8 airplane 

captured an anomalous G/S beam 

during an ILS approach, which resulted 

in a higher-than-expected descent rate 

during the final segment of an ILS 

approach due to persistent inertial 

coasting, which can result in misleading 

flight director guidance. When the 

autopilot was disconnected, the F/D 

continued to command a flight path 

away from the G/S without warning, 

which the flightcrew appeared to 

follow. Both GLIDESLOPE and TOO 

LOW TERRAIN alerts annunciated 

while the airplane continued to 

descend. Ultimately, the flightcrew was 

able to recover the airplane and 

conducted a Go-Around procedure. No 

injuries to passengers or crew, or 

damage to the airframe, was reported. 

It has been determined that Model 

777 airplanes can experience the same 

anomaly. G/S beam anomalies that 

occur in a discrete G/S capture window 

can result in reversion to inertial paths 

in which the auto-flight vertical 

guidance diverges from the G/S beam at 

higher-than-expected descent rates. The 

flightcrew may follow the misleading F/ 

D guidance after disconnecting the A/P, 

without reference to the other available 

information and flight deck indications. 

This condition, if not addressed, could 

result in a late touchdown, a runway 

excursion, or controlled flight into 

terrain. 

Related Rulemaking 

The FAA may consider issuing 

additional rulemaking to address the 

identified unsafe condition on 

additional Boeing airplane models with 

the same G/S issue. 

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. 

Material Incorporated by Reference 

Under 1 CFR Part 51 

The FAA reviewed Boeing Alert 

Requirements Bulletin 777–22A0046 

RB, dated October 25, 2022. This 

material specifies procedures for 

installing new AFDC OPS, doing a 

software configuration check, and 

making sure that the correct software 

part number is installed in the correct 

location. 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. 

Proposed AD Requirements in This 

NPRM 

This proposed AD would require 

accomplishing the actions specified in 

the material 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 material at regulations.gov under 

Docket No. FAA–2024–2713. 

Costs of Compliance 

The FAA estimates that this AD, if 

adopted as proposed, would affect 266 

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 

Software installation and configuration check .. 2 work-hours × $85 per hour = $170 ............... $13 $183 $48,678 

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. 


khammond on DSK9W7S144PROD with PROPOSALS
Federal Register / Vol. 89, No. 248 / Friday, December 27, 2024 / Proposed Rules 105487 

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– 

2024–2713; Project Identifier AD–2024– 

00328–T. 

(a) Comments Due Date 

The FAA must receive comments on this 

airworthiness directive (AD) by February 10, 

2025. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to The Boeing Company 

Model 777–200, –200LR, –300, –300ER, and 

777F series airplanes, certificated in any 

category, as identified in Boeing Alert 

Requirements Bulletin 777–22A0046 RB, 

dated October 25, 2022. 

(d) Subject 

Air Transport Association (ATA) of 

America Code 22, Auto flight. 

(e) Unsafe Condition 

This AD was prompted by a report 

indicating that an airplane experienced a 

glideslope (G/S) beam anomaly during an 

instrument landing system (ILS) approach, 

which resulted in a higher-than-expected 

descent rate during the final segment of an 

ILS approach. The FAA is issuing this AD to 

address misleading flight director guidance 

that the flightcrew might follow after 

disconnecting the autopilot, without 

reference to the other available information 

and flight deck indications. The unsafe 

condition, if not addressed, could result in a 

late touchdown, a runway excursion, or 

controlled flight into terrain. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Required Actions 

Except as specified in paragraph (h) of this 

AD: At the applicable times specified in 

paragraph 3., ‘‘Compliance,’’ of Boeing Alert 

Requirements Bulletin 777–22A0046 RB, 

dated October 25, 2022, do all applicable 

actions identified in, and in accordance with, 

the Accomplishment Instructions of Boeing 

Alert Requirements Bulletin 777–22A0046 

RB, dated October 25, 2022. 

Note 1 to paragraph (g): Guidance for 

accomplishing the actions required by this 

AD can be found in Boeing Alert Service 

Bulletin 777–22A0046, dated October 25, 

2022, which is referred to in Boeing Alert 

Requirements Bulletin 777–22A0046 RB, 

dated October 25, 2022. 

(h) Exception to Service Information 

Specifications 

Where the Compliance Time column of the 

table in the ‘‘Compliance’’ paragraph of 

Boeing Alert Requirements Bulletin 777– 

22A0046 RB, dated October 25, 2022, refers 

to ‘‘the Original Issue date of Requirements 

Bulletin 777–22A0046 RB,’’ this AD requires 

using the effective date of this AD. 

(i) Alternative Methods of Compliance 

(AMOCs) 

(1) The Manager, AIR–520, Continued 

Operational Safety 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 paragraph (j)(1) of this AD. 

Information may be emailed to: AMOC@

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, AIR–520, Continued Operational 

Safety 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. 

(j) Related Information 

(1) For more information about this AD, 

contact Michael Closson, Aviation Safety 

Engineer, FAA, 2200 South 216th St., Des 

Moines, WA 98198; phone: 206–231–3973; 

email: Michael.P.Closson@faa.gov. 

(2) Material identified in this AD that is not 

incorporated by reference is available at the 

address specified in paragraph (k)(3) of this 

AD. 

(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 the AD specifies otherwise. 

(i) Boeing Alert Requirements Bulletin 

777–22A0046 RB, dated October 25, 2022. 

(ii) [Reserved] 

(3) For Boeing material 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; website myboeingfleet.com. 

(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 December 19, 2024. 

Suzanne Masterson, 

Deputy Director, Integrated Certificate 

Management Division, Aircraft Certification 

Service. 

[FR Doc. 2024–30918 Filed 12–26–24; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2024–2714; Project 

Identifier MCAI–2024–00405–T] 

RIN 2120–AA64 

Airworthiness Directives; Deutsche 

Aircraft GmbH (Type Certificate 

Previously Held by 328 Support 

Services GmbH; AvCraft Aerospace 

GmbH; Fairchild Dornier GmbH; 

Dornier Luftfahrt GmbH) 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 all 

Deutsche Aircraft GmbH (Type 

Certificate previously held by 328 

Support Services GmbH; AvCraft 

Aerospace GmbH; Fairchild Dornier 

GmbH; Dornier Luftfahrt GmbH) Model 

328–100 and Model 328–300 airplanes. 

This proposed AD was prompted by a 

report of a nose landing gear (NLG) 

uplock bracket assembly cracking. This 

proposed AD would require an 

inspection of the affected part and 

applicable on-condition actions, 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 February 10, 

2025. 

ADDRESSES: You may send comments, 

using the procedures found in 14 CFR 

11.43 and 11.45, by any of the following 

methods: 


khammond on DSK9W7S144PROD with PROPOSALS