This section of the FEDERAL REGISTER

contains regulatory documents having general

applicability and legal effect, most of which

are keyed to and codified in the Code of

Federal Regulations, which is published under

50 titles pursuant to 44 U.S.C. 1510.

The Code of Federal Regulations is sold by

the Superintendent of Documents.

Rules and Regulations Federal Register

9425 

Vol. 87, No. 35 

Tuesday, February 22, 2022 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2021–0662; Project 

Identifier MCAI–2021–00031–E; Amendment 

39–21943; AD 2022–04–02] 

RIN 2120–AA64 

Airworthiness Directives; Rolls-Royce 

Deutschland Ltd & Co KG (Type 

Certificate Previously Held by RollsRoyce plc) Turbofan Engines 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: The FAA is adopting a new 

airworthiness directive (AD) for certain 

Rolls-Royce Deutschland Ltd & Co KG 

(RRD) Trent 1000 model turbofan 

engines. This AD was prompted by 

reports of high levels of wear on the seal 

fins on a small number of certain highpressure turbine triple seals. This AD 

requires manual deactivation of the 

modulated air system (MAS) control 

valves. The FAA is issuing this AD to 

address the unsafe condition on these 

products. 

DATES: This AD is effective March 29, 

2022. 

The Director of the Federal Register 

approved the incorporation by reference 

of a certain publication listed in this AD 

as of March 29, 2022. 

ADDRESSES: For service information 

identified in this final rule, contact 

Rolls-Royce plc, Corporate 

Communications, P.O. Box 31, Derby, 

DE24 8BJ, United Kingdom; phone: +44 

(0)1332 242424; fax: +44 (0)1332 

249936; website: https://www.rollsroyce.com/contact-us.aspx. 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– 

0662. 

Examining the AD Docket 

You may examine the AD docket at 

https://www.regulations.gov by 

searching for and locating Docket No. 

FAA–2021–0662; 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. 

FOR FURTHER INFORMATION CONTACT: 

Kevin Clark, Aviation Safety Engineer, 

ECO Branch, FAA, 1200 District 

Avenue, Burlington, MA 01803; phone: 

(781) 238–7088; fax: (781) 238–7199; 

email: kevin.m.clark@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Background 

The FAA issued a supplemental 

notice of proposed rulemaking (SNPRM) 

to amend 14 CFR part 39 by adding an 

AD that would apply to certain RRD 

(Type Certificate previously held by 

Rolls-Royce plc) Trent 1000–AE3, Trent 

1000–CE3, Trent 1000–D3, Trent 1000– 

G3, Trent 1000–H3, Trent 1000–J3, 

Trent 1000–K3, Trent 1000–L3, Trent 

1000–M3, Trent 1000–N3, Trent 1000– 

P3, Trent 1000–Q3, and Trent 1000–R3 

model turbofan engines. The SNPRM 

published in the Federal Register on 

November 05, 2021 (86 FR 61083). The 

SNPRM was prompted by the notice of 

proposed rulemaking (NPRM) being 

placed in incorrect Docket No. FAA– 

2021–0637 instead of Docket No. FAA– 

2021–0662, which caused some 

commenters to experience difficulty 

commenting on the NPRM. In the 

SNPRM, the FAA proposed to require 

manual deactivation of the MAS control 

valves. The FAA is issuing this AD to 

address the unsafe condition on these 

products. 

The European Union Aviation Safety 

Agency (EASA), which is the Technical 

Agent for the Member States of the 

European Union, has issued EASA AD 

2021–0009, dated January 8, 2021 

(referred to after this as ‘‘the MCAI’’), to 

address the unsafe condition on these 

products. The MCAI states: 

The Modulated Air System (MAS) 

optimises cooling air, extracted from the 

compressor, where full flow is not required 

at cruise conditions. It is only active during 

cruise. Recently, occurrences have been 

reported of finding high levels of wear on the 

seal fins on a small number of high pressure 

turbine triple seals, Part Number FW34485. 

The effect on the secondary air system was 

conservatively assessed due to the resultant 

increased turbine cooling air leakage, which 

changes the cooling flow around the 

intermediate pressure (IP) turbine disc. 

This condition, if not corrected, could lead 

to temperature increase at the IP turbine disc 

rim when the MAS is active, possibly 

resulting in IP turbine disc failure and high 

energy debris release, with consequent 

damage to, and reduced control of, the 

aeroplane. To address this potential unsafe 

condition, Rolls-Royce has issued the NMSB, 

providing instructions to manually ‘lock-out’ 

(deactivate) the MAS control valves. 

For the reason described above, this 

[EASA] AD requires to deactivate the MAS 

control valves. This [EASA] AD also specifies 

that the Master Minimum Equipment List 

(MMEL) item for ‘MAS inoperative’, which 

has a limit of 120 days, does not apply when 

the system is manually deactivated. 

You may obtain further information 

by examining the MCAI in the AD 

docket at https://www.regulations.gov 

by searching for and locating Docket No. 

FAA–2021–0662. 

Discussion of Final Airworthiness 

Directive 

Comments 

The FAA received a comment from 

one commenter, Roll-Royce plc (RR). 

The following presents the comment 

received on the SNPRM and the FAA’s 

response to the comment. 

Request To Consider Improved Solution 

as a Terminating Action 

RR stated that it has no objections to 

the SNPRM as written but requested 

that the FAA consider an improved 

solution that is being developed by RR 

as a terminating action for this AD. RR 

noted that the improved solution would 

permanently deactivate the MAS system 

without initiating engine indicating and 

crew alerting system (EICAS) messages. 

RR reasoned that deactivation of the 

MAS was introduced as an immediate 

containment action; however, this 

solution produces spurious EICAS 

messages, indicating a malfunction in 


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9426 Federal Register / Vol. 87, No. 35 / Tuesday, February 22, 2022 / Rules and Regulations 

the MAS system. As a result, operators 

are instructed not to follow the 

minimum equipment list instructions 

and limitations. 

The FAA will consider the improved 

solution as a possible terminating action 

and may consider future rulemaking 

once the improved solution becomes 

available. The FAA did not change this 

AD as a result of this comment. 

Conclusion 

The FAA reviewed the relevant data, 

considered the comment received, and 

determined that air safety and the 

public interest require adopting this AD 

as proposed. Accordingly, the FAA is 

issuing this AD to address the unsafe 

condition on these products. This AD is 

adopted as proposed in the SNPRM. 

Related Service Information Under 1 

CFR Part 51 

The FAA reviewed Rolls-Royce Alert 

Non-Modification Service Bulletin Trent 

1000 75–AK642, Initial Issue, dated 

November 30, 2020. The service 

information specifies procedures for 

deactivating the MAS control valves. 

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. 

Costs of Compliance 

The FAA estimates that this AD 

affects 4 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 

Deactivate the MAS control valves ................. 2 work-hours × $85 per hour = $170 ............. $0 $170 $680 

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 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: 

2022–04–02 Rolls-Royce Deutschland Ltd & 

Co KG (Type Certificate previously held 

by Rolls-Royce plc): Amendment 39– 

21943; Docket No. FAA–2021–0662; 

Project Identifier MCAI–2021–00031–E. 

(a) Effective Date 

This airworthiness directive (AD) is 

effective March 29, 2022. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to Rolls-Royce 

Deutschland Ltd & Co KG (RRD) (Type 

Certificate previously held by Rolls-Royce 

plc) Trent 1000–AE3, Trent 1000–CE3, Trent 

1000–D3, Trent 1000–G3, Trent 1000–H3, 

Trent 1000–J3, Trent 1000–K3, Trent 1000– 

L3, Trent 1000–M3, Trent 1000–N3, Trent 

1000–P3, Trent 1000–Q3, and Trent 1000–R3 

model turbofan engines. 

(d) Subject 

Joint Aircraft System Component (JASC) 

Code 7250, Turbine Section. 

(e) Unsafe Condition 

This AD was prompted by reports of high 

levels of wear on the seal fins on a small 

number of certain high-pressure turbine 

triple seals. The FAA is issuing this AD to 

ensure cooling airflow restoration to the 

intermediate-pressure turbine (IPT) disk rim 

during cruise by deactivating the modulated 

air system (MAS). The unsafe condition, if 

not addressed, could result in a temperature 

increase at the IPT disk rim when the MAS 

is active during cruise, resulting in failure of 

the IPT disk, loss of engine thrust control, 

and loss of the airplane. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Required Actions 

Within the compliance time specified in 

figure 1 to paragraph (g) of this AD, 

deactivate the MAS control valves using the 

Accomplishment Instructions, paragraphs 

3.A.(6) and 3.A.(7), of Rolls-Royce Alert NonModification Service Bulletin Trent 1000 75– 

AK642, Initial Issue, dated November 30, 

2020. 

Note 1 to paragraph (g): Deactivation of the 

MAS control valves on an engine required by 

paragraph (g) of this AD changes the engine 

to an approved configuration that will 

produce engine indicating and crew alerting 

system (EICAS) status messages ‘‘ENG MAS 

VALVE L/R’’ and ‘‘ENG MAS SYS TEST L/ 

R.’’ Since MAS is purposely disabled after 

compliance with paragraph (g) of this AD, 

these status messages do not indicate 

inoperative (failed) equipment and, 

consequently, the operator’s existing FAAapproved minimum equipment list (MEL) 

instructions and limitations, including the 

120-day operation limitation, do not apply. 

Note 2 to paragraph (g): Deactivation of the 

MAS control valves on an engine as required 

by paragraph (g) of this AD does not produce 

the EICAS status message ‘‘ENG MAS VALVE 

SENSOR L/R.’’ Consequently, when this 

EICAS message displays, it remains 

indicative of inoperative equipment, even if 


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Federal Register / Vol. 87, No. 35 / Tuesday, February 22, 2022 / Rules and Regulations 9427 

the MAS has been disabled as required by 

paragraph (g) of this AD. As a result, the 

corresponding MEL instructions and 

limitations apply whenever the EICAS status 

message ‘‘ENG MAS VALVE SENSOR L/R’’ is 

displayed. 

(h) 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 ECO Branch, send it to 

the attention of the person identified in 

paragraph (i)(1) of this AD and email 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. 

(i) Related Information 

(1) For more information about this AD, 

contact Kevin Clark, Aviation Safety 

Engineer, ECO Branch, FAA, 1200 District 

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

238–7088; fax: (781) 238–7199; email: 

kevin.m.clark@faa.gov. 

(2) Refer to European Union Aviation 

Safety Agency (EASA) AD 2021–0009, dated 

January 8, 2021, 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–2021–0662. 

(j) 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) Rolls-Royce Alert Non-Modification 

Service Bulletin Trent 1000 75–AK642, 

Initial Issue, dated November 30, 2020. 

(ii) [Reserved] 

(3) For Rolls-Royce service information 

identified in this AD, contact Rolls-Royce 

plc, Corporate Communications, P.O. Box 31, 

Derby, DE24 8BJ, United Kingdom; phone: 

+44 (0)1332 242424; fax: +44 (0)1332 249936; 

website: https://www.rolls-royce.com/ 

contact-us.aspx. 

(4) You may view this service information 

at 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. 

(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 February 3, 2022. 

Lance T. Gant, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2022–03638 Filed 2–18–22; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2022–0144; Project 

Identifier AD–2022–00042–T; Amendment 

39–21952; AD 2022–05–01] 

RIN 2120–AA64 

Airworthiness Directives; Learjet, Inc., 

Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule; request for 

comments. 

SUMMARY: The FAA is adopting a new 

airworthiness directive (AD) for certain 

Learjet, Inc., Model 35, 35A (C–21A), 

36, 36A, 55, 55B, 55C, and 60 airplanes. 

This AD was prompted by a report 

indicating that a repair station approved 

Learjet spoiler assemblies for return to 

service after extending their life limit. 

This AD requires removing certain 

spoiler assemblies from service and 

prohibits their installation. The FAA is 

issuing this AD to address the unsafe 

condition on these products. 

DATES: This AD is effective March 9, 

2022. 

The FAA must receive comments on 

this AD by April 8, 2022. 

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 

https://www.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. 

Examining the AD Docket 

You may examine the AD docket at 

https://www.regulations.gov by 

searching for and locating Docket No. 

FAA–2022–0144; 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 street address for 

Docket Operations is listed above. 

FOR FURTHER INFORMATION CONTACT: Tara 

Shawn, Aerospace Engineer, Airframe 

and Services Section, FAA, Wichita 

ACO Branch, 1801 Airport Road, Room 

100, Wichita, KS 67209; phone: 316– 

946–4141; email: Tara.Shawn@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Background 

On September 14, 2021, the FAA 

Kansas City Flight Standards District 

Office (FSDO) received a report that a 

repair station, Restored Aircraft Sales 

and Service, LLC, had approved several 

Learjet spoiler assemblies for return to 

service after completing a life limit 

extension. The Kansas City FSDO 

notified the Wichita ACO Branch of this 

issue on September 22, 2021. 

Investigation by the Kansas City 

FSDO and Wichita ACO Branch 

revealed that after overhauling or 

repairing spoiler assemblies for Learjet 

airplanes, the repair station extended 

the FAA-approved life limit of the 

spoiler assemblies, in some cases by 


lotter on DSK11XQN23PROD with RULES1ER22FE22.000</GPH>

Figure 1 to paragraph (g) - Compliance time 

MAS deactivation Compliance time, whichever occurs later after the effective 

option date of this AD, A or B 

A Within 50 engine flight cycles (FCs) since new 

B Within 30 days or 100 FCs, whichever occurs first