10878 Federal Register / Vol. 86, No. 34 / Tuesday, February 23, 2021 / Proposed Rules 

(800) 810–4853; email: pubs@

gulfstream.com; website: https://

www.gulfstream.com/en/customer-support/. 

You may view this referenced service 

information at the FAA, Airworthiness 

Products Section, Operational Safety Branch, 

901 Locust, Kansas City, Missouri 64106. For 

information on the availability of this 

material at the FAA, call (816) 329–4148. 

Issued on January 29, 2021. 

Gaetano A. Sciortino, 

Deputy Director for Strategic Initiatives, 

Compliance & Airworthiness Division, 

Aircraft Certification Service. 

[FR Doc. 2021–03483 Filed 2–22–21; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2021–0022; Project 

Identifier MCAI–2020–00395–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 all 

Rolls-Royce Deutschland Ltd & Co KG 

(RRD) Trent XWB–75, Trent XWB–79, 

Trent XWB–79B, Trent XWB–84, and 

Trent XWB–97 model turbofan engines. 

This proposed AD was prompted by the 

manufacturer revising the time limits 

manual (TLM) to incorporate repairs to 

the low-pressure compressor (LPC) 

blades and introduce a new fan blade 

inspection. This proposed AD would 

require revisions to the airworthiness 

limitations section (ALS) of the RollsRoyce (RR) Trent XWB TLM and the 

operator’s existing approved aircraft 

maintenance program (AMP). 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 April 9, 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; email: https://

www.rolls-royce.com/contact-us/civilaerospace.aspx; 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–2021–0022; 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: 

Scott Stevenson, Aviation Safety 

Engineer, ECO Branch, FAA, 1200 

District Avenue, Burlington, MA 01803; 

phone: (781) 238–7132; fax: (781) 238– 

7199; email: Scott.M.Stevenson@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–2021–0022; Project Identifier 

MCAI–2020–00395–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 Scott Stevenson, 

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 2020–0066, dated March 23, 2020 

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

address the unsafe condition on these 

products. The MCAI states: 

The Airworthiness Limitations Section 

instructions for Trent XWB engines, which 

are approved by EASA, are defined and 

published in TLM TRENTXWB–K0680– 

TIME0–01. These instructions have been 

identified as mandatory for continued 

airworthiness. 

Failure to accomplish these instructions 

could result in an unsafe condition. 

Rolls-Royce recently revised the TLM, 

introducing new and/or more restrictive 

instructions. 

For the reason described above, this 

[EASA] AD requires accomplishment of the 

instructions specified in the TLM, as defined 

in this AD. 

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–2021–0022. 

FAA’s Determination 

This product has been approved by 

EASA and is approved for operation in 

the United States. Pursuant to our 

bilateral agreement with the European 

Community, EASA has notified the FAA 

Federal Register / Vol. 86, No. 34 / Tuesday, February 23, 2021 / Proposed Rules 10879 

of the unsafe condition described in the 

MCAI and service information. The 

FAA is issuing this NPRM because the 

agency evaluated all the relevant 

information provided by EASA and 

determined the unsafe condition 

described previously is likely to exist or 

develop in other products of the same 

type design. 

Related Service Information 

The FAA reviewed Rolls-Royce 

Airworthiness Limitations (Mandatory 

Inspections), TRENTXWB–A–05–20– 

01–00A01–030A–D, Revision 013, dated 

September 1, 2019, of the Rolls-Royce 

Trent XWB TLM TRENTXWB–K0680– 

TIME0–01, and Rolls-Royce 

Airworthiness Limitations (Mandatory 

Inspections), TRENTXWB–B–05–20– 

01–00A01–030A–D, Revision 005, dated 

April 1, 2020, of the Rolls-Royce Trent 

XWB TLM TRENTXWB–K0680–TIME0– 

01. These two sections of the TLM 

specify inspection intervals, 

differentiated by engine model, for 

critical rotating parts. 

Proposed AD Requirements in This 

NPRM 

This proposed AD would require 

revisions to the ALS of the RR Trent 

XWB TLM, as applicable to each engine 

model, and to the operator’s existing 

approved AMP, to include new or more 

restrictive sections of the applicable RR 

Trent XWB TLM for each affected 

engine model. 

Differences Between This Proposed AD 

and the MCAI or Service Information 

EASA AD 2020–0066, dated March 

23, 2020, requires that operators replace 

each component before exceeding the 

applicable life limit and that each 

mandatory inspection is accomplished 

within the thresholds and intervals, as 

specified in the latest revision of the 

TLM. This proposed AD would not 

mandate these actions because the 

manufacturer did not revise the life 

limit for any components with its 

revision to the TLM. 

Costs of Compliance 

The FAA estimates that this AD, if 

adopted as proposed, would affect 22 

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 

Revise the ALS of the RR Trent XWB TLM 

and the operator’s existing approved AMP.

1 work-hour × $85 per hour = $85 ................. $0 $85 $1,870 

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–2021–0022; 

Project Identifier MCAI–2020–00395–E. 

(a) Comments Due Date 

The FAA must receive comments on this 

airworthiness directive (AD) by April 9, 

2021. 

(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 XWB–75, Trent XWB–79, Trent 

XWB–79B, Trent XWB–84, and Trent XWB– 

97 model turbofan engines. 

(d) Subject 

Joint Aircraft System Component (JASC) 

Code 7200, Engine Turbine/Turboprop. 

(e) Unsafe Condition 

This AD was prompted by the 

manufacturer revising the time limits manual 

(TLM) to incorporate repairs to the lowpressure compressor (LPC) blades and 

introduce a new fan blade inspection. The 

FAA is issuing this AD to prevent the failure 

of critical rotating parts. The unsafe 

condition, if not addressed, could result in 

failure of one or more engines, loss of 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 120 days after the effective date of 

this AD, revise the Rolls-Royce (RR) Trent 

XWB TLM, as applicable to each engine 

model, and the operator’s existing approved 

10880 Federal Register / Vol. 86, No. 34 / Tuesday, February 23, 2021 / Proposed Rules 

aircraft maintenance program (AMP) by 

incorporating the following: 

(1) For Trent XWB–75, Trent XWB–79, 

Trent XWB–79B, and Trent XWB–84 model 

turbofan engines, add Figure 1 to paragraph 

(g)(1) of this AD to the airworthiness 

limitations section (ALS) of RR Trent XWB 

TLM TRENTXWB–K0680–TIME0–01. 

(2) For Trent XWB–97 model turbofan 

engines, add Figure 2 to paragraph (g)(2) of 

this AD to the ALS of RR Trent XWB TLM 

TRENTXWB–K0680–TIME0–01. 

Note 1 to paragraph (g): Figure 1 to 

Paragraph (g)(1) and Figure 2 to Paragraph 

(g)(2) contain language from the original 

equipment manufacturer’s TLM. 

(h) Definition 

For the purpose of this AD, the operator’s 

existing approved AMP is defined as the 

basis for which the operator or the owner 

ensures the continuing airworthiness of each 

operated airplane. 

(i) 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 Related Information. 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. 

(j) Related Information 

(1) For more information about this AD, 

contact Scott Stevenson, Aviation Safety 

Engineer, ECO Branch, FAA, 1200 District 

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

238–7132; fax: (781) 238–7199; email: 

Scott.M.Stevenson@faa.gov. 

(2) Refer to European Union Aviation 

Safety Agency AD 2020–0066, dated March 

23, 2020, for more information. You may 

examine the EASA AD in the AD docket at 

https://www.regulations.gov by searching for 

and locating it in Docket No. FAA–2021– 

0022. 

(3) For service information identified in 

this AD, contact Rolls-Royce plc, Corporate 

Communications, P.O. Box 31, Derby, United 

Kingdom, DE24 8BJ; phone: +44 (0)1332 

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

https://www.rolls-royce.com/contact-us/civilaerospace.aspx; website: https://www.rollsroyce.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 January 29, 2021. 

Gaetano A. Sciortino, 

Deputy Director for Strategic Initiatives, 

Compliance & Airworthiness Division, 

Aircraft Certification Service. 

[FR Doc. 2021–02225 Filed 2–22–21; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 71 

[Docket No. FAA–2021–0008; Airspace 

Docket No. 20–AWP–50] 

RIN 2120–AA66 

Proposed Amendment of Class D and 

Revocation of Class E Airspace; Gila 

Bend, AZ 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: This action proposes to 

amend the Class D airspace and revoke 


EP23FE21.000</GPH> EP23FE21.001</GPH>