76408 Federal Register / Vol. 89, No. 181 / Wednesday, September 18, 2024 / Rules and Regulations 

(1) The requirements specified in 

paragraphs (1) and (2) of EASA AD 2021– 

0132 do not apply to this AD. 

(2) Paragraph (3) of EASA AD 2021–0132 

specifies revising ‘‘the approved AMP 

[aircraft maintenance program]’’ within 12 

months after its effective date, but this AD 

requires revising the existing maintenance or 

inspection program, as applicable, to 

incorporate the ‘‘limitations, tasks and 

associated thresholds and intervals’’ 

specified in paragraph (3) of EASA AD 2021– 

0132 within 90 days after February 15, 2022 

(the effective date of AD 2021–26–05). 

(3) The initial compliance time for doing 

the tasks specified in paragraph (3) of EASA 

AD 2021–0132 is at the applicable 

‘‘associated thresholds’’ specified in 

paragraph (3) of EASA AD 2021–0132, or 

within 90 days after February 15, 2022 (the 

effective date of AD 2021–26–05), whichever 

occurs later. 

(4) The provisions specified in paragraphs 

(4) and (5) of EASA AD 2021–0132 do not 

apply to this AD. 

(5) The ‘‘Remarks’’ section of EASA AD 

2021–0132 does not apply to this AD. 

(i) Retained Restrictions on Alternative 

Actions, Intervals, and Critical Design 

Configuration Control Limitations (CDCCLs), 

With a New Exception 

This paragraph restates the requirements of 

paragraph (l) of AD 2021–26–05, with a new 

exception. Except as required by paragraph 

(j) of this AD, after the maintenance or 

inspection program has been revised as 

required by paragraph (g) of this AD, no 

alternative actions (e.g., inspections), 

intervals, and CDCCLs are allowed unless 

they are approved as specified in the 

provisions of the ‘‘Ref. Publications’’ section 

of EASA AD 2021–0132. 

(j) New Revision of the Existing Maintenance 

or Inspection Program 

Except as specified in paragraph (k) of this 

AD: Comply with all required actions and 

compliance times specified in, and in 

accordance with, EASA AD 2023–0220, 

dated December 21, 2023 (EASA AD 2023– 

0220). Accomplishing the revision of the 

existing maintenance or inspection program 

required by this paragraph terminates the 

requirements of paragraph (g) of this AD. 

(k) Exceptions to EASA AD 2023–0220 

(1) This AD does not adopt the 

requirements specified in paragraphs (1) and 

(2) of EASA AD 2023–0220. 

(2) Paragraph (3) of EASA AD 2023–0220 

specifies revising ‘‘the AMP’’ within 12 

months after its effective date, but this AD 

requires revising the existing maintenance or 

inspection program, as applicable, within 90 

days after the effective date of this AD. 

(3) The initial compliance time for doing 

the tasks specified in paragraph (3) of EASA 

AD 2023–0220 is at the applicable 

‘‘limitations’’ and ‘‘associated thresholds’’ as 

incorporated by the requirements of 

paragraph (3) of EASA AD 2023–0220, or 

within 90 days after the effective date of this 

AD, whichever occurs later. 

(4) This AD does not adopt the provisions 

specified in paragraphs (4) and (5) of EASA 

AD 2023–0220. 

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

section of EASA AD 2023–0220. 

(l) New No Alternative Actions, Intervals, or 

CDCCLs 

After the existing maintenance or 

inspection program has been revised as 

required by paragraph (j) of this AD, no 

alternative actions (e.g., inspections), 

intervals, or CDCCLs are allowed unless they 

are approved as specified in the provisions 

of the ‘‘Ref. Publications’’ section of EASA 

AD 2023–0220. 

(m) 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, mail it to the address identified in 

paragraph (n) of this AD. Information may be 

emailed to: 9-AVS-AIR-730-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 Saab AB’s EASA 

Design Organization Approval (DOA). If 

approved by the DOA, the approval must 

include the DOA-authorized signature. 

(n) 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. 

(o) Material Incorporated by Reference 

(1) The Director of the Federal Register 

approved the incorporation by reference 

(IBR) 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. 

(3) The following material was approved 

for IBR on October 23, 2024. 

(i) European Union Aviation Safety Agency 

(EASA) AD 2023–0220, dated December 21, 

2023. 

(ii) [Reserved] 

(4) The following material was approved 

for IBR on February 15, 2022 (87 FR 1335, 

January 11, 2022). 

(i) European Union Aviation Safety Agency 

(EASA) AD 2021–0132, dated May 25, 2021. 

(ii) [Reserved] 

(5) For EASA AD 2023–0220 and EASA AD 

2021–0132, 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 these EASA ADs on the EASA 

website at ad.easa.europa.eu. 

(6) 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. 

(7) 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 September 12, 2024. 

Victor Wicklund, 

Deputy Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2024–21183 Filed 9–17–24; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2024–1469; Project 

Identifier MCAI–2024–00130–T; Amendment 

39–22810; AD 2024–16–04] 

RIN 2120–AA64 

Airworthiness Directives; Bombardier, 

Inc. Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: The FAA is superseding 

Airworthiness Directive (AD) 2009–25– 

13, which applied to certain 

Bombardier, Inc., Model BD–100–1A10 

(Challenger 300) airplanes. AD 2009– 

25–13 required the deactivation of the 

left-hand (LH) baggage bay heater mat. 

Since the FAA issued AD 2009–25–13, 

Bombardier developed a new design 

solution for the potential uncontrolled 

heating of the baggage bay sidewall 

heater mat. This AD retains the 

requirements of AD 2009–25–13 and 

requires modifying the baggage bay 

sidewall interior panel, heater mat, and 

water tank heater installation, and doing 

functional testing. Upon the completion 

of the new actions, the retained 

requirements of AD 2009–25–13 will 

terminate. This AD also revises the 

applicability. The FAA is issuing this 

AD to address the unsafe condition on 

these products. 

DATES: This AD is effective October 23, 

2024. 

The Director of the Federal Register 

approved the incorporation by reference 

of a certain publication listed in this AD 

as of October 23, 2024. 


khammond on DSKJM1Z7X2PROD with RULES
Federal Register / Vol. 89, No. 181 / Wednesday, September 18, 2024 / Rules and Regulations 76409 

The Director of the Federal Register 

approved the incorporation by reference 

of a certain other publication listed in 

this AD as of December 28, 2009 (74 FR 

65401, December 10, 2009). 

ADDRESSES: 

AD Docket: You may examine the AD 

docket at regulations.gov under Docket 

No. FAA–2024–1469; 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 final rule, the mandatory 

continuing airworthiness information 

(MCAI), any comments received, and 

other information. The address for 

Docket Operations is U.S. Department of 

Transportation, Docket Operations, M– 

30, West Building Ground Floor, Room 

W12–140, 1200 New Jersey Avenue SE, 

Washington, DC 20590. 

Material Incorporated by Reference: 

• For Bombardier, Inc. material 

identified in this AD, contact 

Bombardier Business Aircraft Customer 

Response Center, 400 Coˆte Vertu Road 

West, Dorval, Que ́bec H4S 1Y9, Canada; 

telephone 514–855–2999; email ac.yul@

aero.bombardier.com; website 

bombardier.com. 

• You may view this material at the 

FAA, Airworthiness Products Section, 

Operational Safety Branch, 2200 South 

216th Street, 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–2024–1469. 

FOR FURTHER INFORMATION CONTACT: 

Steven Dzierzynski, Aviation Safety 

Engineer, FAA, 1600 Stewart Avenue, 

Suite 410, Westbury, NY 11590; 

telephone 516–228–7300; email 9-avsnyaco-cos@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Background 

The FAA issued a notice of proposed 

rulemaking (NPRM) to amend 14 CFR 

part 39 to supersede AD 2009–25–13, 

Amendment 39–16133 (74 FR 65401, 

December 10, 2009) (AD 2009–25–13). 

AD 2009–25–13 applied to certain 

Bombardier, Inc., Model BD–100–1A10 

airplanes. AD 2009–25–13 required the 

deactivation of the LH baggage bay 

heater. The FAA issued AD 2009–25–13 

to address the possibility of 

uncontrolled heating by the heater 

panel, and on the baggage bay 

compartment, that could result in a fire 

in the baggage bay. 

The NPRM published in the Federal 

Register on May 22, 2024 (89 FR 44930). 

The NPRM was prompted by AD CF– 

2023–72, dated October 18, 2023, issued 

by Transport Canada, which is the 

aviation authority for Canada (Transport 

Canada AD CF–2023–72) (also referred 

to as the MCAI). The MCAI states that 

new procedures have been developed 

for modifications of the baggage bay 

sidewall interior panel, heater mat, and 

water tank heater installation that will 

address the unsafe condition. 

In the NPRM, the FAA proposed to 

continue to require the actions in AD 

2009–25–13, and further require 

modifying the baggage bay sidewall 

interior panel, heater mat, and water 

tank heater installation, and doing 

functional testing. In the NPRM, the 

FAA proposed that, upon the 

completion of the new actions, the 

retained requirements of AD 2009–25– 

13 would terminate. In the NPRM, the 

FAA also proposed to revise the 

applicability to clarify that the AD 

applies to airplanes having certain serial 

numbers (which equates to those 

equipped with sidewall heater having 

part number (P/N) 3436–06–1/0) instead 

of part numbers which could be 

misread. The FAA is issuing this AD to 

address the unsafe condition on these 

products. 

You may examine the MCAI in the 

AD docket at regulations.gov under 

Docket No. FAA–2024–1469. 

Discussion of Final Airworthiness 

Directive 

Comments 

The FAA received no comments on 

the NPRM or on the determination of 

the cost to the public. 

Additional Changes Made to This Final 

Rule 

In the NPRM, the FAA inadvertently 

stated that the NPRM proposed to 

prohibit the installation of affected 

parts. This AD does not contain a parts 

installation prohibition, so the FAA 

deleted references to such a prohibition. 

Conclusion 

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 

reviewed the relevant data and 

determined that air safety requires 

adopting this AD as proposed. 

Accordingly, the FAA is issuing this AD 

to address the unsafe condition on this 

product. Except for minor editorial 

changes, this AD is adopted as proposed 

in the NPRM. None of the changes will 

increase the economic burden on any 

operator. 

Material Incorporated by Reference 

Under 1 CFR Part 51 

The FAA reviewed Bombardier 

Service Bulletin 100–25–35, Revision 

02, dated January 11, 2016. This 

material specifies procedures for 

modifying the LH baggage bay sidewall 

interior panel and heater mat, installing 

a LH baggage bay sidewall interior panel 

blind insert for certain airplanes, 

modifying the wiring of the LH and 

right-hand (RH) baggage bay sidewall 

heater mats, re-identifying the LH heater 

mat as P/N 3436–07, installing LH and 

RH heater pictograms for certain 

airplanes, modifying the water tank 

heater installation, and performing a 

functional test. 

This AD also requires Bombardier 

Service Bulletin A100–25–30, dated July 

20, 2009, which the Director of the 

Federal Register approved for 

incorporation by reference as of 

December 28, 2009 (74 FR 65401, 

December 10, 2009). 

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. 

Costs of Compliance 

The FAA estimates that this AD 

affects 340 airplanes of U.S. registry. 

The FAA estimates the following costs 

to comply with this AD: 

ESTIMATED COSTS FOR REQUIRED ACTIONS

Action Labor cost Parts cost Cost per 

product 

Cost on U.S. 

operators 

Heater mat deactivation (Retained actions from AD 

2009–25–13).

1 work-hour × $85 per hour = $85 .... $0 $85 $28,900 

Modification and testing (new actions) ............................. 12 work-hours × $85 per hour = 

$1,020.

1,150 2,170 737,800 


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76410 Federal Register / Vol. 89, No. 181 / Wednesday, September 18, 2024 / Rules and Regulations 

The FAA has included all known 

costs in its cost estimate. According to 

the manufacturer, however, some or all 

of the costs of this AD may be covered 

under warranty, thereby reducing the 

cost impact on affected operators. 

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 

This AD will not have federalism 

implications under Executive Order 

13132. This AD will 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 that this AD: 

(1) Is not a ‘‘significant regulatory 

action’’ under Executive Order 12866, 

(2) Will not affect intrastate aviation 

in Alaska, and 

(3) Will 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 Amendment 

Accordingly, under the authority 

delegated to me by the Administrator, 

the FAA amends 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: 

■ a. Removing Airworthiness Directive 

2009–25–13, Amendment 39–16133 (74 

FR 65401, December 10, 2009); and 

■ b. Adding the following new 

Airworthiness Directive: 

2024–16–04 Bombardier, Inc.: Amendment 

39–22810; Docket No. FAA–2024–1469; 

Project Identifier MCAI–2024–00130–T. 

(a) Effective Date 

This airworthiness directive (AD) is 

effective October 23, 2024. 

(b) Affected ADs 

This AD replaces AD 2009–25–13, 

Amendment 39–16133 (74 FR 65401, 

December 10, 2009) (AD 2009–25–13). 

(c) Applicability 

This AD applies to Bombardier, Inc., 

Model BD–100–1A10 airplanes, certificated 

in any category, serial numbers 20003 

through 20364 inclusive, 20366, 20367, 

20369, and 20372. 

(d) Subject 

Air Transport Association (ATA) of 

America Code 25, Equipment/Furnishings. 

(e) Reason 

This AD was prompted by reports of the 

baggage bay sidewall heater mat 

malfunctioning and by the development of a 

new design solution for the potential 

uncontrolled heating of the heater mats. The 

FAA is issuing this AD to address 

malfunctioning of a baggage bay sidewall 

heater mat. The unsafe condition, if not 

addressed, could result in a fire in the 

baggage bay. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Retained Actions, With No Changes 

This paragraph restates the requirements of 

paragraph (g) of AD 2009–25–13, with no 

changes. Within 100 flight hours after 

December 28, 2009 (the effective date of AD 

2009–25–13), deactivate the left-hand (LH) 

baggage bay sidewall heater having part 

number (P/N) 3436–06–1/0, in accordance 

with Bombardier Service Bulletin A100–25– 

30, dated July 20, 2009. 

(h) New Requirement of This AD: 

Modification 

Within 36 months after the effective date 

of this AD, do the applicable actions 

specified in paragraphs (h)(1) through (7) of 

this AD, in accordance with paragraphs 2.B. 

through 2.E. of the Accomplishment 

Instructions of Bombardier Service Bulletin 

100–25–35, Revision 02, dated January 11, 

2016. 

(1) Remove the baggage bay sidewall heater 

mat part number (P/N) 3436–06–1/0 from the 

LH sidewall panel. 

(2) Modify the LH baggage bay sidewall 

interior panel and heater mat. 

(3) Modify the wiring of the LH and righthand (RH) baggage bay sidewall heater mats. 

(4) Reidentify the LH baggage bay sidewall 

heater mat as P/N 3436–07. 

(5) For airplanes having serial numbers (S/ 

N) 20124, 20125, 20128, 20134, 20139, 

20143, 20146, and 20148 to 20215 inclusive: 

install LH baggage bay sidewall interior panel 

blind insert. 

(6) For airplanes having S/N 20003 to 

20259 inclusive: install LH and RH heater 

pictogram. 

(7) Modify the water tank heater 

installation. 

(i) New Requirement of This AD: Functional 

Test 

Before further flight after completing 

paragraph (h) of this AD, perform the 

functional tests, in accordance with 

paragraph 2.F. of the Accomplishment 

Instructions of Bombardier Service Bulletin 

100–25–35, Revision 02, dated January 11, 

2016. 

(j) Terminating Action for Heater Mat 

Deactivation 

Modifying and testing an airplane as 

required by paragraphs (h) and (i) of this AD 

terminate the requirements of paragraph (g) 

of this AD. 

(k) Credit for Previous Actions 

This paragraph provides credit for actions 

required by paragraphs (h) and (i) of this AD, 

if those actions were performed before the 

effective date of this AD using Bombardier 

Service Bulletin 100–25–35, dated November 

15, 2012, or Bombardier Service Bulletin 

100–25–35, Revision 01, dated September 23, 

2013. 

(l) Additional AD Provisions 

(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, mail it to the address identified in 

paragraph (m) of this AD. Information may be 

emailed to: 9-AVS-NYACO-COS@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 Transport Canada; or 

Bombardier, Inc.’s Transport Canada Design 

Approval Organization (DAO). If approved by 

the DAO, the approval must include the 

DAO-authorized signature. 

(m) Additional Information 

For more information about this AD, 

contact Steven Dzierzynski, Aviation Safety 

Engineer, FAA, 1600 Stewart Avenue, Suite 

410, Westbury, NY 11590; telephone 516– 

228–7300; email 9-avs-nyaco-cos@faa.gov. 


khammond on DSKJM1Z7X2PROD with RULES
Federal Register / Vol. 89, No. 181 / Wednesday, September 18, 2024 / Rules and Regulations 76411 

(n) Material Incorporated by Reference 

(1) The Director of the Federal Register 

approved the incorporation by reference 

(IBR) 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. 

(3) The following material was approved 

for IBR on October 23, 2024. 

(i) Bombardier Service Bulletin 100–25–35, 

Revision 02, dated January 11, 2016. 

(ii) [Reserved] 

(4) The following material was approved 

for IBR on December 28, 2009 (74 FR 65401, 

December 10, 2009). 

(i) Bombardier Service Bulletin A100–25– 

30, dated July 20, 2009. 

(ii) [Reserved] 

(5) For Bombardier, Inc. material identified 

in this AD, contact Bombardier Business 

Aircraft Customer Response Center, 400 CoˆteVertu Road West, Dorval, Que ́bec H4S 1Y9, 

Canada; telephone 514–855–2999; email 

ac.yul@aero.bombardier.com; website 

bombardier.com. 

(6) You may view this material at the FAA, 

Airworthiness Products Section, Operational 

Safety Branch, 2200 South 216th Street, Des 

Moines, WA. For information on the 

availability of this material at the FAA, call 

206–231–3195. 

(7) 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 September 12, 2024. 

Victor Wicklund, 

Deputy Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2024–21180 Filed 9–17–24; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2023–1987; Project 

Identifier MCAI–2023–00807–T; Amendment 

39–22806; AD 2024–15–14] 

RIN 2120–AA64 

Airworthiness Directives; ATR–GIE 

Avions de Transport Re ́gional 

Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: The FAA is superseding 

Airworthiness Directive (AD) 2021–17– 

02, which applied to all ATR–GIE 

Avions de Transport Re ́gional Model 

ATR42–200, –300, and –320 airplanes. 

AD 2021–17–02 required a one-time 

inspection for discrepancies of the wire 

bundles between the left- and righthand angle of attack (AOA) probes and 

the crew alerting computer, and, 

depending on findings, applicable 

corrective actions. AD 2021–17–02 also 

required, for certain airplanes, 

modifying the captain stick shaker 

wiring, and for all airplanes, revising 

the existing aircraft flight manual (AFM) 

and applicable corresponding 

operational procedures to incorporate 

procedures for the stick pusher/shaker. 

Since the FAA issued AD 2021–17–02, 

additional modification of the affected 

wiring for certain airplanes was 

developed. This AD retains all of the 

requirements of AD 2021–17–02 and 

requires installing a new AOA power 

supply unit and removing the AFM 

amendment; as specified in a European 

Union Aviation Safety Agency (EASA) 

AD, which is incorporated by reference. 

The FAA is issuing this AD to address 

the unsafe condition on these products. 

DATES: This AD is effective October 23, 

2024. 

The Director of the Federal Register 

approved the incorporation by reference 

of a certain publication listed in this AD 

as of October 23, 2024. 

ADDRESSES: 

AD Docket: You may examine the AD 

docket at regulations.gov under Docket 

No. FAA–2023–1987; 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 final rule, the mandatory 

continuing airworthiness information 

(MCAI), any comments received, and 

other information. The address for 

Docket Operations is U.S. Department of 

Transportation, Docket Operations, M– 

30, West Building Ground Floor, Room 

W12–140, 1200 New Jersey Avenue SE, 

Washington, DC 20590. 

Material Incorporated by Reference: 

• For EASA material identified in this 

AD, contact EASA, Konrad-AdenauerUfer 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 

ad.easa.europa.eu. 

• You may view this material at the 

FAA, Airworthiness Products Section, 

Operational Safety Branch, 2200 South 

216th Street, 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–2023–1987. 

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: 

Background 

The FAA issued a notice of proposed 

rulemaking (NPRM) to amend 14 CFR 

part 39 to supersede AD 2021–17–02, 

Amendment 39–21685 (86 FR 48490, 

August 31, 2021) (AD 2021–17–02). AD 

2021–17–02 applied to all ATR–GIE 

Avions de Transport Re ́gional Model 

ATR42–200, –300, and –320 airplanes. 

AD 2021–17–02 required a one-time 

inspection for discrepancies of the wire 

bundles between the left- and righthand AOA probes and the crew alerting 

computer, and, depending on findings, 

applicable corrective actions. AD 2021– 

17–02 also required for certain 

airplanes, modifying the captain stick 

shaker wiring, and for all airplanes, 

revising the existing AFM and 

applicable corresponding operational 

procedures to incorporate procedures 

for the stick pusher/shaker. The FAA 

issued AD 2021–17–02 to address false 

activation of the stall warning system 

due to wiring damage on the wire 

bundle between an AOA probe and the 

crew alerting computer, which could 

result in loss of control of the airplane 

during take-off and landing phases. 

The NPRM published in the Federal 

Register on October 5, 2023 (88 FR 

69102). The NPRM was prompted by 

AD 2023–0134, dated July 5, 2023 

(EASA AD 2023–0134), issued by 

EASA, which is the Technical Agent for 

the Member States of the European 

Union. EASA AD 2023–0134 states final 

modification instructions of the affected 

wiring were developed. 

In the NPRM, the FAA proposed to 

require installing a new AOA power 

supply unit and revising the existing 

AFM, as specified in EASA AD 2023– 

0134. 

The FAA issued a supplemental 

notice of proposed rulemaking (SNPRM) 

to amend 14 CFR part 39 to supersede 

AD 2021–17–02. The SNPRM published 

in the Federal Register on May 21, 2024 

(89 FR 44568). The SNPRM was 

prompted by additional modification of 

the affected wiring for certain airplanes, 

and by the issuance of EASA AD 2023– 

0191, dated November 2, 2023 (EASA 

AD 2023–0191) (also referred to as the 

MCAI). In the SNPRM, the FAA 

proposed to retain all of the 

requirements of AD 2021–17–02. The 

NPRM also proposed to require 

installing a new AOA power supply 

unit and removing the AFM 

amendment. The FAA is issuing this AD 

to address the unsafe condition on these 

products. 


khammond on DSKJM1Z7X2PROD with RULES