Federal Register / Vol. 86, No. 154 / Friday, August 13, 2021 / Proposed Rules 44655 

(i) No Reporting Requirement 

Although MD Helicopters Service Bulletin 

SB369H–263R2, SB369D–229R2, SB369E– 

129R2, SB369F–119R2, SB500N–066R2, and 

SB600N–080R2, each dated March 24, 2021, 

specify to submit certain information to the 

manufacturer, this AD does not include that 

requirement. 

(j) Alternative Methods of Compliance 

(AMOCs) 

(1) The Manager, Los Angeles ACO, 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, information may be emailed to: 9- 

ANM-LAACO-AMOC-REQUESTS@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 Payman Soltani, Aerospace Engineer, 

Airframe Section, Los Angeles ACO Branch, 

Compliance & Airworthiness Division, FAA, 

3960 Paramount Blvd., Lakewood, CA 90712; 

telephone (562) 627–5313; email 

payman.soltani@faa.gov. 

(2) For service information identified in 

this AD, contact MD Helicopters, Inc., Attn: 

Customer Support Division, 4555 E 

McDowell Rd., Mail Stop M615, Mesa, AZ 

85215–9734; telephone (800) 388–3378; fax 

(480) 346–6813; or at https:// 

www.mdhelicopters.com. You may view this 

referenced service information at the FAA, 

Office of the Regional Counsel, Southwest 

Region, 10101 Hillwood Pkwy., Room 6N– 

321, Fort Worth, TX 76177. For information 

on the availability of this material at the 

FAA, call (817) 222–5110. 

Issued on August 2, 2021. 

Lance T. Gant, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2021–17032 Filed 8–12–21; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2021–0662; Project 

Identifier MCAI–2021–00031–E] 

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: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: The FAA proposes to adopt a 

new airworthiness directive (AD) for 

certain Rolls-Royce Deutschland Ltd & 

Co KG (RRD) Trent 1000 model turbofan 

engines. This proposed 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. This proposed AD would require 

manual deactivation of the modulated 

air system (MAS) control valves. The 

FAA is proposing this AD to address the 

unsafe condition on these products. 

DATES: The FAA must receive comments 

on this proposed AD by September 27, 

2021. 

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. 

For service information identified in 

this NPRM, 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. 

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 (781) 238–7759. 

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 

NPRM, the mandatory continuing 

airworthiness information (MCAI), any 

comments received, and other 

information. The street address for 

Docket Operations is listed above. 

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: 

Comments Invited 

The FAA invites you to send any 

written relevant data, views, or 

arguments about this proposal. Send 

your comments to an address listed 

under ADDRESSES. Include ‘‘Docket No. 

FAA–2021–0662; Project Identifier 

MCAI–2021–00031–E’’ at the beginning 

of your comments. The most helpful 

comments reference a specific portion of 

the proposal, explain the reason for any 

recommended change, and include 

supporting data. The FAA will consider 

all comments received by the closing 

date and may amend this proposal 

because of those comments. 

Except for Confidential Business 

Information (CBI) as described in the 

following paragraph, and other 

information as described in 14 CFR 

11.35, the FAA will post all comments 

received, without change, to https://

www.regulations.gov, including any 

personal information you provide. The 

agency will also post a report 

summarizing each substantive verbal 

contact received about this NPRM. 

Confidential Business Information 

CBI is commercial or financial 

information that is both customarily and 

actually treated as private by its owner. 

Under the Freedom of Information Act 

(FOIA) (5 U.S.C. 552), CBI is exempt 

from public disclosure. If your 

comments responsive to this NPRM 

contain commercial or financial 

information that is customarily treated 

as private, that you actually treat as 

private, and that is relevant or 

responsive to this NPRM, it is important 

that you clearly designate the submitted 

comments as CBI. Please mark each 

page of your submission containing CBI 

as ‘‘PROPIN.’’ The FAA will treat such 

marked submissions as confidential 

under the FOIA, and they will not be 

placed in the public docket of this 

NPRM. Submissions containing CBI 

should be sent to Kevin Clark, Aviation 

Safety Engineer, ECO Branch, FAA, 

1200 District Avenue, Burlington, MA 

01803. Any commentary that the FAA 

receives which is not specifically 

designated as CBI will be placed in the 

public docket for this rulemaking. 

Background 

The European Union Aviation Safety 

Agency (EASA), which is the Technical 

Agent for the Member States of the 

European Community, has issued EASA 

AD 2021–0009, dated January 8, 2021 

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


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44656 Federal Register / Vol. 86, No. 154 / Friday, August 13, 2021 / Proposed Rules 

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 FW3448. 

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. 

FAA’s Determination 

This product has been approved by 

EASA and is approved for operation in 

the United States. Pursuant to the FAA’s 

bilateral agreement with the European 

Community, EASA has notified the FAA 

of the unsafe condition described in the 

MCAI and service information. The 

FAA is issuing this AD because the 

agency evaluated all the relevant 

information provided by EASA and has 

determined that the unsafe condition 

described previously is likely to exist or 

develop in other products of the same 

type design. 

Related Service Information Under 1 

CFR Part 51 

The FAA reviewed Rolls-Royce Alert 

Non-Modification Service Bulletin 

(NMSB) Trent 1000 75–AK642, Initial 

Issue, dated November 30, 2020. This 

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. 

Proposed AD Requirements in This 

NPRM 

This proposed AD would require 

manual deactivation of the MAS control 

valves. Manual deactivation of the MAS 

control valves changes the engine to an 

approved configuration that will 

produce engine indicating and crew 

alerting system (EICAS) status messages 

that do not indicate inoperative (failed) 

equipment. Consequently, when these 

messages are displayed, the operator’s 

existing FAA-approved minimum 

equipment list (MEL) instructions and 

limitations, including the 120-day 

operation limitation, do not apply. 

Interim Action 

The FAA considers that this proposed 

AD would be an interim action. If final 

action is later identified, the FAA might 

consider additional rulemaking. 

Costs of Compliance 

The FAA estimates that this AD, if 

adopted as proposed, would affect 4 

engines installed on airplanes of U.S. 

registry. 

The FAA estimates the following 

costs to comply with this proposed AD: 

ESTIMATED COSTS

Action Labor cost Parts cost Cost per 

product 

Cost on U.S. 

operators 

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 

The FAA determined that this 

proposed AD would not have federalism 

implications under Executive Order 

13132. This proposed AD would not 

have a substantial direct effect on the 

States, on the relationship between the 

national Government and the States, or 

on the distribution of power and 

responsibilities among the various 

levels of government. 

For the reasons discussed above, I 

certify this proposed regulation: 

(1) Is not a ‘‘significant regulatory 

action’’ under Executive Order 12866, 

(2) Would not affect intrastate 

aviation in Alaska, and 

(3) Would not have a significant 

economic impact, positive or negative, 

on a substantial number of small entities 

under the criteria of the Regulatory 

Flexibility Act. 

List of Subjects in 14 CFR Part 39 

Air transportation, Aircraft, Aviation 

safety, Incorporation by reference, 

Safety. 

The Proposed Amendment 

Accordingly, under the authority 

delegated to me by the Administrator, 

the FAA proposes to amend 14 CFR part 

39 as follows: 

PART 39—AIRWORTHINESS 

DIRECTIVES 

■ 1. The authority citation for part 39 

continues to read as follows: 

Authority: 49 U.S.C. 106(g), 40113, 44701. 

§ 39.13 [Amended] 

■ 2. The FAA amends § 39.13 by adding 

the following new airworthiness 

directive: 

Rolls-Royce Deutschland Ltd & Co KG (Type 

Certificate previously held by RollsRoyce plc): Docket No. FAA–2021–0662; 

Project Identifier MCAI–2021–00031–E. 

(a) Comments Due Date 

The FAA must receive comments on this 

airworthiness directive (AD) by September 

27, 2021. 

(b) Affected ADs 

None. 


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Federal Register / Vol. 86, No. 154 / Friday, August 13, 2021 / Proposed Rules 44657 

(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 

(HPT) triple seals. The FAA is issuing this 

AD to prevent wear on the seal fins on the 

affected HPT triple seals. The unsafe 

condition, if not addressed, could result in 

failure of the intermediate-pressure turbine 

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 modulated air system (MAS) 

control valves using the Accomplishment 

Instructions, paragraphs 3.A.(6) and 3.A.(7), 

of Rolls-Royce Alert Non-Modification 

Service Bulletin (NMSB) 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 

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. 

FIGURE 1 TO PARAGRAPH (g)—COMPLIANCE TIME

MAS deactivation 

option Compliance time, whichever occurs later after the effective 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. 

(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 certification office, 

send it to the attention of the person 

identified in Related Information. 

Information may be emailed to: ANE-ADAMOC@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) For 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. 

You may view this referenced 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 (781) 238–7759. 

Issued on August 5, 2021. 

Lance T. Gant, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2021–17071 Filed 8–12–21; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2021–0659; Project 

Identifier 2018–SW–112–AD] 

RIN 2120–AA64 

Airworthiness Directives; Leonardo 

S.p.a. Helicopters 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: The FAA proposes to adopt a 

new airworthiness directive (AD) for all 

Leonardo S.p.a. Model A109A, A109A 

II, A109C, A109E, A109K2, A109S, 

AW109SP, A119, and AW119 MKII 

helicopters. This proposed AD was 

prompted by a report of damage to a 

rigid connecting link (rod), and 

loosening of the nut on the upper rod 

end. This proposed AD would require a 

visual inspection of the affected rods for 

damage, cracks, or abnormal play, and 

corrective actions if necessary, as 

specified in a European Aviation Safety 

Agency (now European Union Aviation 

Safety Agency) (EASA) AD, which is 

proposed for incorporation by reference 

(IBR). The FAA is proposing this AD to 

address the unsafe condition on these 

products. 

DATES: The FAA must receive comments 

on this proposed AD by September 27, 

2021. 

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. 

For EASA material that is proposed 

for IBR in this AD, contact EASA, 

Konrad-Adenauer-Ufer 3, 50668 

Cologne, Germany; phone: +49 221 8999 

000; email: ADs@easa.europa.eu; 

internet www.easa.europa.eu. You may 

find this IBR material on the EASA 

website at https://ad.easa.europa.eu. 

You may view this material at the FAA, 

Office of the Regional Counsel, 


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