Federal Register / Vol. 89, No. 186 / Wednesday, September 25, 2024 / Rules and Regulations 78231 

(d) Subject 

Air Transport Association (ATA) of 

America Code 56, Windows. 

(e) Unsafe Condition 

This AD was prompted by reports of 

cracks, delamination, and failure of the flight 

deck side windows during certification 

fatigue tests. The FAA is issuing this AD to 

address such cracks and delamination, and 

any other damage of the flight deck side 

windows. The unsafe condition, if not 

addressed, could result in flight deck side 

windows to fail and lead to an in-flight 

depressurization event. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Requirements 

Except as specified in paragraph (h) of this 

AD: Comply with all required actions and 

compliance times specified in, and in 

accordance with, ANAC AD 2020–04–01R02. 

(h) Exceptions to ANAC AD 2020–04–01R02 

(1) Where ANAC AD 2020–04–01R02 refers 

to its effective date, this AD requires using 

the effective date of this AD. 

(2) Where paragraph (b)(1) of ANAC AD 

2020–04–01R02 refers to April 17, 2020 (the 

effective date of the original issue of ANAC 

AD 2020–04–01), this AD requires using 

January 21, 2021 (the effective date of AD 

2020–25–07). 

(3) Where paragraph (b)(1)(iii) of ANAC AD 

2020–04–01R02 specifies ‘‘In case of no 

crack, delamination, or any other damage, no 

action is required at this time,’’ this AD 

requires replacing that text with ‘‘in the case 

of no findings specified in paragraphs 

(b)(1)(i) and (ii) of ANAC AD 2020–04– 

01R02, no further action is required by this 

AD until the next inspection interval.’’ 

(4) Where paragraph (b)(2) of ANAC AD 

2020–04–01R02 refers to the compliance time 

of the repetitive inspections, ‘‘at each 750 

Flight Hours (FH),’’ this AD requires 

replacing that text with ‘‘at intervals not to 

exceed 750 flight hours.’’ 

(5) Where paragraph (c) of ANAC AD 

2020–04–01R02 refers to the compliance time 

for the replacement of the flight deck side 

windows as, ‘‘before the airplane logs 3,400 

Flight Cycles Since New (FCSN),’’ this AD 

requires replacing that text with ‘‘before the 

airplane logs 3,400 FCSN, or within 50 flight 

cycles after the effective date of this AD, 

whichever occurs later.’’ 

(6) Replacement of the flight deck side 

windows as specified in paragraph (c) of 

ANAC AD 2020–04–01R02 terminates the 

repetitive inspections for the flight deck side 

windows specified in paragraph (b)(2) of 

ANAC AD 2020–04–01R02. 

(7) This AD does not adopt paragraph (e) 

of ANAC AD 2020–04–01R02. 

(i) 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 (j) 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 ANAC; or ANAC’s 

authorized Designee. If approved by the 

ANAC Designee, the approval must include 

the Designee’s authorized signature. 

(j) Additional Information 

For more information about this AD, 

contact Hassan Ibrahim, Aviation Safety 

Engineer, FAA, 1600 Stewart Avenue, Suite 

410, Westbury, NY 11590; telephone 206– 

231–3653; email Hassan.M.Ibrahim@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) Ageˆncia Nacional de Aviac ̧a ̃o Civil 

(ANAC) AD 2020–04–01R02, effective 

November 2, 2023. 

(ii) [Reserved] 

(3) For ANAC material identified in this 

AD, contact ANAC, Aeronautical Products 

Certification Branch (GGCP), Rua Dr. Orlando 

Feirabend Filho, 230-Centro Empresarial 

Aquarius-Torre B-Andares 14 a 18, Parque 

Residencial Aquarius, CEP 12.246–190–Sa ̃o 

Jose ́ dos Campos-SP, Brazil; telephone 55 

(12) 3203–6600; email pac@anac.gov.br; 

website anac.gov.br/en/. You may find this 

ANAC AD on the ANAC website at 

sistemas.anac.gov.br/certificacao/DA/ 

DAE.asp. 

(4) 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. 

(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-locationsoremailfr.inspection@nara.gov. 

Issued on September 19, 2024. 

Victor Wicklund, 

Deputy Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2024–21853 Filed 9–24–24; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2024–1479; Project 

Identifier MCAI–2023–00657–T; Amendment 

39–22824; AD 2024–16–18] 

RIN 2120–AA64 

Airworthiness Directives; Bombardier, 

Inc., Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: The FAA is adopting a new 

airworthiness directive (AD) for certain 

Bombardier, Inc., Model BD–100–1A10 

airplanes. This AD was prompted by a 

determination that a revised restrictive 

airworthiness limitation is necessary. 

This AD requires revising the existing 

maintenance or inspection program, as 

applicable, to incorporate a revised 

restrictive airworthiness limitation for 

the aft engine mount attachment bolts. 

The FAA is issuing this AD to address 

the unsafe condition on these products. 

DATES: This AD is effective October 30, 

2024. 

The Director of the Federal Register 

approved the incorporation by reference 

of certain publications listed in this AD 

as of October 30, 2024. 

ADDRESSES: 

AD Docket: You may examine the AD 

docket at regulations.gov under Docket 

No. FAA–2024–1479; 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 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 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–2024–1479. 


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78232 Federal Register / Vol. 89, No. 186 / Wednesday, September 25, 2024 / Rules and Regulations 

FOR FURTHER INFORMATION CONTACT: 

Yaser Osman, Aviation Safety Engineer, 

FAA, 1600 Stewart Avenue, Suite 410, 

Westbury, NY 11590; telephone 516– 

228–7300; email 9-avs-nyaco-cos@

faa.gov. 

SUPPLEMENTARY INFORMATION: 

Background 

The FAA issued a notice of proposed 

rulemaking (NPRM) to amend 14 CFR 

part 39 by adding an AD that would 

apply to certain Bombardier, Inc., Model 

BD–100–1A10 airplanes. The NPRM 

published in the Federal Register on 

June 5, 2024 (89 FR 48139). The NPRM 

was prompted by AD CF–2023–29, 

dated May 5, 2023, issued by Transport 

Canada, which is the aviation authority 

for Canada (referred to after this as the 

MCAI). The MCAI states that the time 

limits/maintenance check (TLMC) 

airworthiness limitation (AWL) Task 

54–51–00–111*, ‘‘Discard of the Aft 

Engine Mount Bolts, Part No. MS21250– 

07, Non-Serialized,’’ was not performed 

on some Challenger 300 in-service 

airplanes due to a misleading part 

number (P/N) referenced in the TLMC 

manual. The task requires the discard 

and replacement of the aft engine mount 

attachment bolt, P/N MS21250–07, 

while the P/N shown in the TLMC 

manual is P/N MS21250–7 in lieu of P/ 

N MS21250–07. Bombardier revised the 

TLMC AWL task and the relevant 

sections in the aircraft maintenance 

manual and the aircraft illustrated parts 

catalog with P/N MS21250–07 to ensure 

timely discard and replacement of the 

aft engine mount attachment bolts. 

In the NPRM, the FAA proposed to 

require revising the existing 

maintenance or inspection program, as 

applicable, to incorporate a revised 

restrictive airworthiness limitation for 

the aft engine mount attachment bolts. 

The FAA is issuing this AD to address 

potential failures of the aft engine 

mount attachment bolt, P/N MS21250– 

07. The unsafe condition, if not 

addressed, could lead to the detachment 

of the engine from the airplane, which 

could contribute to a catastrophic 

failure. 

You may examine the MCAI in the 

AD docket at regulations.gov under 

Docket No. FAA–2024–1479. 

Discussion of Final Airworthiness 

Directive 

Comments 

The FAA received no comments on 

the NPRM or on the determination of 

the cost to the public. 

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 the following 

documents. This material specifies a 

revised airworthiness limitation for the 

replacement of the aft engine mount 

attachment bolts, P/N MS21250–07. 

These documents are distinct since they 

apply to different airplane 

configurations. The asterisk (or ‘‘one 

star’’) with the last three digits of the 

task numbers indicates that the task is 

an airworthiness limitation task. 

• Task 54–51–00–111* ‘‘Discard of 

the Aft Engine Mount Bolts, Part No. 

MS21250–07, Non-Serialized,’’ Section 

5–10–10 ‘‘Life Limits (Structures),’’ Part 

2 ‘‘Airworthiness Limitations,’’ of the 

Bombardier Challenger 300 Time 

Limits/Maintenance Check, Publication 

No. CH 300 TLMC, Revision 24, dated 

August 9, 2023. 

• Task 54–51–00–111* ‘‘Discard of 

the Aft Engine Mount Bolts, Part No. 

MS21250–07, Non-Serialized,’’ Section 

5–10–10 ‘‘Life Limits (Structures),’’ Part 

2 ‘‘Airworthiness Limitations,’’ of the 

Bombardier Challenger 350 Time 

Limits/Maintenance Check, Publication 

No. CH 350 TLMC, Revision 14, dated 

August 9, 2023. 

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 731 airplanes of U.S. registry. 

The FAA estimates the following costs 

to comply with this AD: 

The FAA has determined that revising 

the maintenance or inspection program 

takes an average of 90 work-hours per 

operator, although the agency 

recognizes that this number may vary 

from operator to operator. Since 

operators incorporate maintenance or 

inspection program changes for their 

affected fleet(s), the FAA has 

determined that a per operator estimate 

is more accurate than a per-airplane 

estimate. Therefore, the agency 

estimates the average total cost per 

operator to be $7,650 (90 work-hours × 

$85 per work-hour). 

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: 


ddrumheller on DSK120RN23PROD with RULES1
Federal Register / Vol. 89, No. 186 / Wednesday, September 25, 2024 / Rules and Regulations 78233 

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: 

2024–16–18 Bombardier, Inc.: Amendment 

39–22824; Docket No. FAA–2024–1479; 

Project Identifier MCAI–2023–00657–T. 

(a) Effective Date 

This airworthiness directive (AD) is 

effective October 30, 2024. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to Bombardier, Inc., 

Model BD–100–1A10 airplanes, certificated 

in any category, having serial numbers (S/Ns) 

20002 through 20912 inclusive. 

(d) Subject 

Air Transport Association (ATA) of 

America Code America Code 54, Nacelles/ 

Pylons. 

(e) Unsafe Condition 

This AD was prompted by a determination 

that new or more restrictive airworthiness 

limitations are necessary. The FAA is issuing 

this AD to address potential failures of the aft 

engine mount attachment bolt, part number 

MS21250–07. The unsafe condition, if not 

addressed, could lead to the detachment of 

the engine from the airplane, which could 

contribute to a catastrophic failure. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Maintenance or Inspection Program 

Revision 

Within 60 days after the effective date of 

this AD, revise the existing maintenance or 

inspection program, as applicable, to 

incorporate the information specified in 

paragraphs (g)(1) and (2) of this AD, as 

applicable. The initial compliance time for 

doing the tasks is at the time specified in the 

applicable time limit/maintenance check 

(TLMC) document specified in paragraphs 

(g)(1) and (2) of this AD, or within 60 days 

after the effective date of this AD, whichever 

occurs later. 

(1) For airplane S/Ns 20002 through 20500 

inclusive: Task 54–51–00–111* ‘‘Discard of 

the Aft Engine Mount Bolts, Part No. 

MS21250–07, Non-Serialized,’’ Section 5– 

10–10 ‘‘Life Limits (Structures),’’ Part 2, 

‘‘Airworthiness Limitations,’’ of the 

Bombardier Challenger 300 Time Limits/ 

Maintenance Check, Publication No. CH 300 

TLMC, Revision 24, dated August 9, 2023. 

(2) For airplane S/Ns 20501 through 20912 

inclusive: Task 54–51–00–111* ‘‘Discard of 

the Aft Engine Mount Bolts, Part No. 

MS21250–07, Non-Serialized,’’ Section 5– 

10–10 ‘‘Life Limits (Structures),’’ Part 2 

‘‘Airworthiness Limitations,’’ of the 

Bombardier Challenger 350 Time Limits/ 

Maintenance Check, Publication No. CH 350 

TLMC, Revision 14, dated August 9, 2023. 

Note 1 to paragraph (g): The asterisk (or 

‘‘one star’’) with the last three digits of the 

task numbers listed in paragraphs (g)(1) and 

(2) of this AD indicates that the task is an 

airworthiness limitation task. 

(h) No Alternative Actions or Intervals 

After the existing maintenance or 

inspection program has been revised as 

required by paragraph (g) of this AD, no 

alternative actions (e.g., inspections) or 

intervals may be used unless the actions or 

intervals, are approved as an alternative 

method of compliance in accordance with 

the procedures specified in paragraph (i)(1) 

of this AD. 

(i) Other FAA 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 (j) 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. 

(j) Additional Information 

For more information about this AD, 

contact Yaser Osman, Aviation Safety 

Engineer, FAA, 1600 Stewart Avenue, Suite 

410, Westbury, NY 11590; telephone 516– 

228–7300; email 9-avs-nyaco-cos@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) Task 54–51–00–111* ‘‘Discard of the Aft 

Engine Mount Bolts, Part No. MS21250–07, 

Non-Serialized,’’ Section 5–10–10 ‘‘Life 

Limits (Structures),’’ Part 2 ‘‘Airworthiness 

Limitations,’’ of the Bombardier Challenger 

300 Time Limits/Maintenance Check, 

Publication No. CH 300 TLMC, Revision 24, 

dated August 9, 2023. 

Note 2 to paragraph (k)(2)(i): The asterisk 

(or ‘‘one star’’) with the last three digits of the 

task numbers listed in paragraphs (k)(2)(i) 

and (ii) of this AD indicates that the task is 

an airworthiness limitation task. 

(ii) Task 54–51–00–111* ‘‘Discard of the 

Aft Engine Mount Bolts, Part No. MS21250– 

07, Non-Serialized,’’ Section 5–10–10 ‘‘Life 

Limits (Structures),’’ of Part 2 ‘‘Airworthiness 

Limitations,’’ of the Bombardier Challenger 

350 Time Limits/Maintenance Check, 

Publication No. CH 350 TLMC, Revision 14, 

dated August 9, 2023. 

(3) For Bombardier 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. 

(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 August 7, 2024. 

Victor Wicklund, 

Deputy Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2024–21807 Filed 9–24–24; 8:45 am] 

BILLING CODE 4910–13–P 

SUSQUEHANNA RIVER BASIN 

COMMISSION 

18 CFR Part 801 

General Policies 

AGENCY: Susquehanna River Basin 

Commission. 

ACTION: Final rule. 

SUMMARY: This document contains rules 

that amend the regulations of the 

Susquehanna River Basin Commission 

(Commission) to provide rules for 

agency procurement and bid protest 

procedures and for updating the general 

policies of the Commission to include 

climate change and environmental 

justice, revising the procedures 

regarding the adoption of the 

comprehensive plan and adding 

language to memorialize the 

Commission’s Dry Cooling Resolution. 

DATES: This rule is effective September 

25, 2024. 

ADDRESSES: Susquehanna River Basin 

Commission, 4423 N Front Street, 

Harrisburg, PA 17110–1788. 

FOR FURTHER INFORMATION CONTACT: 

Jason E. Oyler, Esq., General Counsel, 


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