Federal Register / Vol. 87, No. 7 / Tuesday, January 11, 2022 / Rules and Regulations 1343 

procedures found in 14 CFR 39.19. In 

accordance with 14 CFR 39.19, send your 

request to your principal inspector or local 

Flight Standards District Office, as 

appropriate. If sending information directly 

to the manager of the certification office, 

send it to the attention of the person 

identified in paragraph (k)(1) of this AD and 

email to: 9-AVS-AIR-730-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) Related Information 

(1) For more information about this AD, 

contact Gregory Johnson, Aviation Safety 

Engineer, FAA, General Aviation & Rotorcraft 

Section, International Validation Section, 901 

Locust, Room 301, Kansas City, MO 64106; 

phone: (720) 626–5462; email: 

gregory.johnson@faa.gov. 

(2) Refer to European Union Aviation 

Safety Agency (EASA) AD 2020–0262, dated 

November 30, 2020, for more information. 

You may examine the EASA AD in the AD 

docket at https://www.regulations.gov by 

searching for and locating Docket No. FAA– 

2021–0871. 

(l) Material Incorporated by Reference 

(1) The Director of the Federal Register 

approved the incorporation by reference of 

the service information listed in this 

paragraph under 5 U.S.C. 552(a) and 1 CFR 

part 51. 

(2) You must use this service information 

as applicable to do the actions required by 

this AD, unless the AD specifies otherwise. 

(i) Vulcanair S.p.A. P.68 Variants Service 

Bulletin No. 263, dated October 20, 2020. 

(ii) [Reserved] 

(3) For service information identified in 

this AD, contact Vulcanair S.p.A., Fulvio 

Oloferni, via Giovanni Pascoli, 7, Naples, 

80026, Italy; phone: +39 081 5918 135; email: 

airworthiness@vulcanair.com; website: 

www.vulcanair.com. 

(4) You may view this service information 

at FAA, Airworthiness Products Section, 

Operational Safety Branch, 901 Locust, 

Kansas City, MO 64106. For information on 

the availability of this material at the FAA, 

call (817) 222–5110. 

(5) You may view this service information 

that is incorporated by reference at the 

National Archives and Records 

Administration (NARA). For information on 

the availability of this material at NARA, 

email: fr.inspection@nara.gov, or go to: 

https://www.archives.gov/federal-register/cfr/ 

ibr-locations.html. 

Issued on December 10, 2021. 

Lance T. Gant, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2022–00056 Filed 1–10–22; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2021–0567; Project 

Identifier AD–2021–00663–E; Amendment 

39–21865; AD 2021–26–06] 

RIN 2120–AA64 

Airworthiness Directives; General 

Electric Company Turbofan Engines 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: The FAA is adopting a new 

airworthiness directive (AD) for certain 

General Electric Company (GE) GE90 

model turbofan engines. This AD was 

prompted by two separate in-flight 

shutdowns (IFSDs) resulting from 

failure of the transfer gearbox (TGB) 

radial bevel gear (TGB radial gearshaft). 

This AD requires visual inspection of 

the TGB radial gearshaft and, depending 

on the results of the inspection, 

replacement of the TGB radial gearshaft. 

The FAA is issuing this AD to address 

the unsafe condition on these products. 

DATES: This AD is effective February 15, 

2022. 

The Director of the Federal Register 

approved the incorporation by reference 

of certain publications listed in this AD 

as of February 15, 2022. 

ADDRESSES: For service information 

identified in this final rule, contact 

General Electric Company, GE Aviation, 

Room 285, 1 Neumann Way, Cincinnati, 

OH 45215; phone: (513) 552–3272; 

email: aviation.fleetsupport@ge.com; 

website: https://www.ge.com. You may 

view this service information at the 

FAA, Airworthiness Products Section, 

Operational Safety Branch, 1200 District 

Avenue, Burlington, MA 01803. For 

information on the availability of this 

material at the FAA, call (817) 222– 

5110. It is also available at https://

www.regulations.gov by searching for 

and locating Docket No. FAA–2021– 

0567. 

Examining the AD Docket 

You may examine the AD docket at 

https://www.regulations.gov by 

searching for and locating Docket No. 

FAA–2021–0567; 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, 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. 

FOR FURTHER INFORMATION CONTACT: 

Stephen Elwin, Aviation Safety 

Engineer, ECO Branch, FAA, 1200 

District Avenue, Burlington, MA 01803; 

phone: (781) 238–7236; fax: (781) 238– 

7199; email: Stephen.L.Elwin@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 all GE GE90–76B, GE90–85B, 

GE90–90B, GE90–94B, GE90–110B1, 

and GE90–115B model turbofan engines 

with a certain TGB radial gearshaft 

installed. The NPRM published in the 

Federal Register on August 12, 2021 (86 

FR 44321). The NPRM was prompted by 

notification of two separate IFSDs 

resulting from the failure of the TGB 

radial gearshaft. After further 

investigation, the manufacturer 

determined that rework on the TGB 

radial gearshaft teeth chamfers during 

manufacturing may have caused local 

burrs and micro-cracks which led to 

high-cycle fatigue failure. GE 

subsequently issued service information 

to provide instructions for a one-time 

visual inspection of the affected radial 

gearshafts for the presence of burrs or 

rework on TGB radial gearshaft teeth 

chamfers. In the NPRM, the FAA 

proposed to require visual inspection of 

the TGB radial gearshaft and, depending 

on the results of the inspection, 

replacement of the TGB radial gearshaft. 

The FAA is issuing this AD to address 

the unsafe condition on these products. 

Discussion of Final Airworthiness 

Directive 

Comments 

The FAA received comments from 5 

commenters. The commenters were Air 

Line Pilots Association, International, 

The Boeing Company, FedEx Express, 

Japan Airlines (JAL), and United 

Airlines. The following presents the 

comments received on the NPRM and 

the FAA’s response to each comment. 

Question on the Difference Between 

This AD and the Service Information 

JAL asked why there is a difference 

between the affected serial numbers (S/ 

Ns) in this AD and the related service 

bulletins (SBs). 

The FAA notes that the applicable 

SBs include several populations of TGB 

radial gearshafts. The FAA determined 

that TGB radial gearshafts with S/Ns 

starting with prefix FIAAXXXX, 

FIA05XXX to FIA09XXX, or FIA0AXXX 

to FIA0NXXX are not subject to the 


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1344 Federal Register / Vol. 87, No. 7 / Tuesday, January 11, 2022 / Rules and Regulations 

unsafe condition in this AD. Although 

this AD does not require that these TGB 

radial gearshafts be inspected and 

removed, operators may still elect to 

inspect these TGB radial gearshaft at the 

next scheduled engine shop visit. 

Request To Clarify Engine Shop Visit 

Definition 

JAL requested that the FAA clarify 

disassembly of the compressor 

discharge pressure (CDP) seal joint in 

the definition of ‘‘engine shop visit.’’ 

JAL indicated that they understand that 

disassembly of the CDP seal joint is the 

same as disassembly of the CDP seal 

flange bolt, but not the same as removal 

of the CDP seal. 

The FAA notes that any disassembly 

of the CDP seal joint meets the 

definition of an engine shop visit. 

Request To Clarify if Inspection Occurs 

During Quick Turn Workscope (QTW) 

JAL asked if the TGB radial gearshaft 

is required to be inspected during 

engine QTW. JAL indicated that GE 

GE90–100 Service Bulletin (SB) 72– 

0857 R01, dated April 28, 2021 (GE90– 

100 SB 72–0857 R01), excludes the 

performance of the inspection during 

QTW. The proposed AD, however, did 

not reference QTW in the required 

inspection. JAL suggested that the FAA 

update this AD to either exclude QTW 

from the compliance requirement for 

inspection or clarify the difference 

between the service information and 

this AD. 

The FAA understands that the CDP 

seal joint, in some cases, may require 

disassembly during a QTW; however, in 

this scenario the appropriate provisions 

would exist to perform the required 

actions of this AD. A QTW that does not 

disassemble the CDP seal joint would 

not meet the definition of an engine 

shop visit, per this AD. 

Addition of Interim Action Paragraph 

The FAA determined the need to add 

the Interim Action paragraph to this AD. 

The manufacturer is investigating if an 

additional population of TGB radial gear 

shafts are affected by the unsafe 

condition of this AD. 

Support for the AD 

Air Line Pilots Association, 

International, The Boeing Company, 

FedEx Express, and United Airlines 

expressed support for the AD as written. 

Conclusion 

The FAA reviewed the relevant data, 

considered any comments received, and 

determined that air safety requires 

adopting this AD as proposed. 

Accordingly, the FAA is issuing this AD 

to address the unsafe condition on these 

products. Except for minor editorial 

changes, and any other changes 

described previously, this AD is 

adopted as proposed in the NPRM. 

None of the changes will increase the 

economic burden on any operator. 

Related Service Information Under 1 

CFR Part 51 

The FAA reviewed GE GE90 Service 

Bulletin (SB) 72–1201 R01, dated April 

28, 2021 (GE90 SB 72–1201 R01), and 

GE90–100 SB 72–0857 R01, dated April 

28, 2021. GE90 SB 72–1201 R01 

specifies procedures for performing a 

one-time inspection of the TGB radial 

gearshaft for presence of burrs or rework 

on teeth chamfers on GE90–76B, GE90– 

85B, GE90–90B, and GE90–94B model 

turbofan engines. GE90–100 SB 72–0857 

R01 specifies procedures for performing 

a one-time inspection of the TGB radial 

gearshaft for presence of burrs or rework 

on teeth chamfers on GE90–110B1 and 

GE90–115B model turbofan engines. 

This service information is reasonably 

available because the interested parties 

have access to it through their normal 

course of business or by the means 

identified in ADDRESSES. 

Interim Action 

The FAA considers this AD to be an 

interim action. If final action is later 

identified, the FAA may consider 

additional rulemaking. 

Costs of Compliance 

The FAA estimates that this AD 

affects 126 engines installed on 

airplanes of U.S. registry. 

The FAA estimates the following 

costs to comply with this AD: 

ESTIMATED COSTS

Action Labor cost Parts cost Cost per 

product 

Cost on U.S. 

operators 

Inspect TGB radial gearshaft .......................... 1 work-hour × $85 per hour = $85 ................. $0 $85 $10,710 

The FAA estimates the following 

costs to do any necessary replacement 

that would be required based on the 

results of the inspection. The agency has 

no way of determining the number of 

aircraft that might need this 

replacement: 

ON-CONDITION COSTS

Action Labor cost Parts cost Cost per 

product 

Replace TGB radial gearshaft ...................................... 60 work-hours × $85 per hour = $5,100 ...................... $24,520 $29,620 

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 


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Federal Register / Vol. 87, No. 7 / Tuesday, January 11, 2022 / Rules and Regulations 1345 

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 adding 

the following new airworthiness 

directive: 

2021–26–06 General Electric Company: 

Amendment 39–21865; Docket No. 

FAA–2021–0567; Project Identifier AD– 

2021–00663–E. 

(a) Effective Date 

This airworthiness directive (AD) is 

effective February 15, 2022. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to General Electric 

Company (GE) GE90–76B, GE90–85B, GE90– 

90B, GE90–94B, GE90–110B1, and GE90– 

115B model turbofan engines with a transfer 

gearbox (TGB) radial bevel gear (TGB radial 

gearshaft) serial number listed in paragraph 

4., APPENDIX—A, Table 1 of GE GE90 

Service Bulletin (SB) 72–1201 R01, dated 

April 28, 2021 (GE90 SB 72–1201 R01) or 

paragraph 4., APPENDIX—A, Table 1 of GE 

GE90–100 SB 72–0857 R01, dated April 28, 

2021 (GE90–100 SB 72–0857 R01). 

(d) Subject 

Joint Aircraft System Component (JASC) 

Code 7260, Turbine Engine Accessory Drive. 

(e) Unsafe Condition 

This AD was prompted by two separate inflight shutdowns resulting from the failure of 

the TGB radial gearshaft. The FAA is issuing 

this AD to prevent failure of the TGB radial 

gearshaft. The unsafe condition, if not 

addressed, could result in failure of one or 

more engines, loss of thrust control, and 

damage to the aircraft. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Required Actions 

(1) At the next engine shop visit after the 

effective date of this AD, perform a visual 

inspection of the affected TGB radial 

gearshaft using Figure 1 to paragraph (g)(1) of 

this AD. 

(2) If, during the visual inspection required 

by paragraph (g)(1) of this AD, discrepancies 

are found that meet the criteria in the 

Accomplishment Instructions, paragraph 

3.A.(4)(a) or 3.A.(4)(b), of GE90 SB 72–1201 

R01 or GE90–100 SB 72–0857 R01, before 

further flight, replace the TGB radial 

gearshaft with a part eligible for installation. 

(h) Definitions 

(1) For the purpose of this AD, an ‘‘engine 

shop visit’’ is when the compressor discharge 

pressure seal joint is disassembled. 

(2) For the purpose of this AD, a ‘‘part 

eligible for installation’’ is a TGB radial 

gearshaft that does not have raised material 

or rework on the teeth chamfers as described 

in the Accomplishment Instructions, 

paragraph 3.A.(4)(a) or 3.A.(4)(b), of GE90 SB 

72–1201 R01 or GE90–100 SB 72–0857 R01. 

(i) Credit for Previous Actions 

You may take credit for the inspection of 

the affected TGB radial gearshaft required by 

paragraph (g)(1) of this AD if you performed 

the inspection before the effective date of this 

AD using GE GE90 SB 72–1201 R00, dated 

January 5, 2021, or GE GE90–100 SB 72–0857 

R00, dated January 5, 2021. 

(j) Alternative Methods of Compliance 

(AMOCs) 

(1) The Manager, ECO Branch, FAA, has 

the authority to approve AMOCs for this AD, 

if requested using the procedures found in 14 

CFR 39.19. In accordance with 14 CFR 39.19, 

send your request to your principal inspector 

or local Flight Standards District Office, as 

appropriate. If sending information directly 

to the manager of the certification office, 

send it to the attention of the person 

identified in paragraph (k) of this AD. You 

may email your request to ANE-AD-AMOC@

faa.gov. 

(2) Before using any approved AMOC, 

notify your appropriate principal inspector, 

or lacking a principal inspector, the manager 

of the local flight standards district office/ 

certificate holding district office. 

(k) Related Information 

For more information about this AD, 

contact Stephen Elwin, Aviation Safety 

Engineer, ECO Branch, FAA, 1200 District 

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

238–7236; fax: (781) 238–7199; email: 

Stephen.L.Elwin@faa.gov. 

(l) Material Incorporated by Reference 

(1) The Director of the Federal Register 

approved the incorporation by reference 

(IBR) of the service information listed in this 

paragraph under 5 U.S.C. 552(a) and 1 CFR 

part 51. 

(2) You must use this service information 

as applicable to do the actions required by 

this AD, unless the AD specifies otherwise. 

(i) General Electric Company (GE) GE90 

Service Bulletin (SB) 72–1201 R01, dated 

April 28, 2021. 

(ii) GE GE90–100 SB 72–0857 R01, dated 

April 28, 2021. 

(3) For GE service information identified in 

this AD, contact General Electric Company, 

GE Aviation, Room 285, 1 Neumann Way, 

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

3272; email: aviation.fleetsupport@ge.com; 

website: https://www.ge.com. 

(4) You may view this service information 

at FAA, Airworthiness Products Section, 

Operational Safety Branch, 1200 District 

Avenue, Burlington, MA 01803. For 


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Figure 1 to Paragraph (g)(l) - Visual Inspection of TGB Radial Gearshaft 

Model Engine Use 

GE90-76B, GE90-85B, Paragraph 3.A.(3)(a)l through J, of GE90 SB 72-1201 

GE90-90B, and GE90-94B ROl 

GE90-11 OB 1 and GE90- Paragraph 3.A.(3)(a)l through J, of GE90-100 SB 72-

115B 0857 ROl 
1346 Federal Register / Vol. 87, No. 7 / Tuesday, January 11, 2022 / Rules and Regulations 

information on the availability of this 

material at the FAA, call (817) 222–5110. 

(5) You may view this service information 

that is incorporated by reference at the 

National Archives and Records 

Administration (NARA). For information on 

the availability of this material at NARA, 

email: fr.inspection@nara.gov, or go to: 

https://www.archives.gov/federal-register/cfr/ 

ibr-locations.html. 

Issued on December 9, 2021. 

Lance T. Gant, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2022–00049 Filed 1–10–22; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2021–0784; Project 

Identifier MCAI–2020–01455–T; Amendment 

39–21857; AD 2021–25–13] 

RIN 2120–AA64 

Airworthiness Directives; Bombardier, 

Inc. Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), Department of 

Transportation (DOT). 

ACTION: Final rule. 

SUMMARY: The FAA is adopting a new 

airworthiness directive (AD) for certain 

Bombardier, Inc., Model CL–600–1A11 

(600), CL–600–2A12 (601), and CL–600– 

2B16 (601–3A, 601–3R, and 604 

Variants) airplanes. This AD was 

prompted by a determination that new 

or more restrictive airworthiness 

limitations are necessary. This AD 

requires revising the existing 

maintenance or inspection program, as 

applicable, to incorporate new or more 

restrictive airworthiness limitations. 

The FAA is issuing this AD to address 

the unsafe condition on these products. 

DATES: This AD is effective February 15, 

2022. 

The Director of the Federal Register 

approved the incorporation by reference 

of certain publications listed in this AD 

as of February 15, 2022. 

ADDRESSES: For service information 

identified in this final rule, contact 

Bombardier Business Aircraft Customer 

Response Center, 400 Coˆte Vertu Road 

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

514–855–2999; email ac.yul@

aero.bombardier.com; internet https://

www.bombardier.com. You may view 

this service information at the FAA, 

Airworthiness Products Section, 

Operational Safety Branch, 2200 South 

216th St., Des Moines, WA. For 

information on the availability of this 

material at the FAA, call 206–231–3195. 

It is also available on the internet at 

https://www.regulations.gov by 

searching for and locating Docket No. 

FAA–2021–0784. 

Examining the AD Docket 

You may examine the AD docket on 

the internet at https://

www.regulations.gov by searching for 

and locating Docket No. FAA–2021– 

0784; 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, 

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. 

FOR FURTHER INFORMATION CONTACT: 

Elizabeth Dowling, Aerospace Engineer, 

Mechanical Systems and Administrative 

Services Section, FAA, New York ACO 

Branch, 1600 Stewart Avenue, Suite 

410, Westbury, NY 11590; telephone 

516–228–7300; fax 516–794–5531; email 

9-avs-nyaco-cos@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Background 

Transport Canada Civil Aviation 

(TCCA), which is the aviation authority 

for Canada, has issued TCCA AD CF– 

2020–44, dated October 23, 2020 

(referred to after this as the Mandatory 

Continuing Airworthiness Information, 

or the MCAI), to correct an unsafe 

condition for certain Bombardier, Inc., 

Model CL–600–1A11 (600), CL–600– 

2A12 (601), and CL–600–2B16 (601–3A, 

601–3R, and 604 Variants) airplanes. 

You may examine the MCAI in the AD 

docket on the internet at https://

www.regulations.gov by searching for 

and locating Docket No. FAA–2021– 

0784. 

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 

CL–600–1A11 (600), CL–600–2A12 

(601), and CL–600–2B16 (601–3A, 601– 

3R, and 604 Variants) airplanes. The 

NPRM published in the Federal 

Register on September 14, 2021 (86 FR 

51029). The NPRM was prompted by a 

determination that new or more 

restrictive airworthiness limitations are 

necessary. The NPRM proposed to 

require revising the existing 

maintenance or inspection program, as 

applicable, to incorporate new or more 

restrictive airworthiness limitations. 

The FAA is issuing this AD to address 

fatigue cracking and loss of structural 

integrity of the circumferential splice 

joint, which could result in reduced 

structural integrity of the airplane. See 

the MCAI for additional background 

information. 

Comments 

The FAA gave the public the 

opportunity to participate in developing 

this final rule. The FAA received no 

comments on the NPRM or on the 

determination of the cost to the public. 

Conclusion 

The FAA reviewed the relevant data 

and determined that air safety and the 

public interest require adopting this 

final rule as proposed, except for minor 

editorial changes. The FAA has 

determined that these minor changes: 

• Are consistent with the intent that 

was proposed in the NPRM for 

addressing the unsafe condition; and 

• Do not add any additional burden 

upon the public than was already 

proposed in the NPRM. 

Related Service Information Under 1 

CFR Part 51 

The FAA reviewed the following 

Bombardier service information, which 

describes new or more restrictive 

airworthiness limitations (a special 

detailed inspection for cracking of the 

skin circumferential splice at fuselage 

station (FS) 559.00, between stringer 

(STR) 10L and STR10R). Note: The 

asterisk (or ‘‘one star’’) with the last 

three digits of the task number indicates 

that the task is an airworthiness 

limitation task. 

• Bombardier Challenger 600 Time 

Limits/Maintenance Checks (TLMC), 

Product Support Publication (PSP) 605, 

Temporary Revision (TR) 5–163, dated 

April 30, 2020, which includes Task 53– 

30–00–165*, ‘‘Skin Circumferential 

Splice at FS559.00, between STR10L 

and STR10R.’’ 

• Bombardier Challenger 601 TLMC, 

PSP 601–5, TR 5–267, dated April 30, 

2020, which includes Task 53–30–00– 

188*, ‘‘Skin Circumferential Splice at 

FS559.00, between STR10L and 

STR10R.’’ 

• Bombardier Challenger 601 TLMC, 

PSP 601A–5, TR 5–281, dated April 30, 

2020, which includes Task 53–30–00– 

191*, ‘‘Skin Circumferential Splice at 

FS559.00, between STR10L and 

STR10R.’’ 

• Section 5–10–30, Airworthiness 

Limitation Items, Bombardier 

Challenger 604 TLMC, Publication No. 

CH 604 TLMC, Part 2, Revision 32, 

dated December 18, 2019, which 

includes Task 53–20–00–192*, ‘‘Special 

Detailed Inspection of the Skin 


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