51600 Federal Register / Vol. 86, No. 177 / Thursday, September 16, 2021 / Rules and Regulations 

21357 (85 FR 81790, December 17, 

2020), and 

■ b. Adding the following new AD: 

2021–18–03 Yabora ̃ Indu ́ stria Aerona ́utica 

S.A. (Type Certificate Previously Held 

by Embraer S.A.) Airplanes: 

Amendment 39–21704; Docket No. 

FAA–2021–0701; Project Identifier 

MCAI–2021–00365–T. 

(a) Effective Date 

This airworthiness directive (AD) becomes 

effective October 1, 2021. 

(b) Affected ADs 

This AD replaces AD 2020–26–02, 

Amendment 39–21357 (85 FR 81790, 

December 17, 2020) (AD 2020–26–02). 

(c) Applicability 

This AD applies to Yabora ̃ Indu ́ stria 

Aerona ́utica S.A. (type certificate previously 

held by Embraer S.A.) Model ERJ 190–400 

airplanes, certificated in any category, as 

identified in Ageˆncia Nacional de Aviac ̧a ̃o 

Civil (ANAC) AD 2020–07–01R01, effective 

March 26, 2021 (ANAC AD 2020–07–01R01). 

(d) Subject 

Air Transport Association (ATA) of 

America Code 72, Turbine/turboprop engine. 

(e) Reason 

This AD was prompted by a report of an 

in-flight shutdown (IFSD) due in part to 

failure in the low-pressure compressor (LPC) 

rotor 1 during operation in high altitude at 

high thrust settings, and by the development 

of updated electronic engine control (EEC) 

software that will prevent the unsafe 

condition. The FAA is issuing this AD to 

address uncontained release of the LPC rotor 

1 and damage to the engine and airplane 

structure, which could result in loss of 

control of the airplane. 

(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 2020–07–01R01. 

(h) Exceptions to ANAC AD 2020–07–01R01 

(1) Where ANAC AD 2020–07–01R01 refers 

to ‘‘the effective date of [ANAC] AD 2020– 

07–01,’’ this AD requires using January 4, 

2021 (the effective date of FAA AD 2020–26– 

02). 

(2) Where ANAC AD 2020–07–01R01 says 

to ‘‘upgrade de EEC software,’’ this AD 

requires to ‘‘upgrade the EEC software.’’ 

(3) Where ANAC AD 2020–07–01R01 refers 

to its effective date, this AD requires using 

the effective date of this AD. 

(4) The ‘‘Alternative method of compliance 

(AMOCs)’’ section of ANAC AD 2020–07– 

01R01 does not apply to this AD. 

(5) Where paragraph (c)(2) of ANAC AD 

2020–07–01R01 requires removing the 

airplane flight manual (AFM) amendments, 

this AD requires that the amendments to the 

existing AFM be removed before further 

flight after the EEC software has been 

updated. 

(i) Other FAA AD Provisions 

The following provisions also apply to this 

AD: 

(1) Alternative Methods of Compliance 

(AMOCs): The Manager, Large Aircraft 

Section, 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 Large Aircraft 

Section, International Validation Branch, 

send it to the attention of the person 

identified in paragraph (j) of this AD. 

Information may be emailed to: 9-AVS-AIR730-AMOC@faa.gov. 

(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, Large Aircraft Section, 

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) Related Information 

For more information about this AD, 

contact Krista Greer, Aerospace Engineer, 

Large Aircraft Section, International 

Validation Branch, FAA, 2200 South 216th 

St., Des Moines, WA 98198; telephone and 

fax 206–231–3221; email krista.greer@

faa.gov. 

(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 this AD specifies otherwise. 

(i) Ageˆncia Nacional de Aviac ̧a ̃o Civil 

(ANAC) AD 2020–07–01R01, effective March 

26, 2021. 

(ii) [Reserved] 

(3) For ANAC AD 2020–07–01R01, contact 

National Civil Aviation Agency (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, Tel: 55 (12) 3203– 

6600; Email: pac@anac.gov.br; internet 

www.anac.gov.br/en/. You may find this IBR 

material on the ANAC website at https://

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 St., Des 

Moines, WA. For information on the 

availability of this material at the FAA, call 

206–231–3195. This material may be found 

in the AD docket on the internet at https:// 

www.regulations.gov by searching for and 

locating Docket No. FAA–2021–0701. 

(5) You may view this material 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/ibrlocations.html. 

Issued on September 9, 2021. 

Ross Landes, 

Deputy Director for Regulatory Operations, 

Compliance & Airworthiness Division, 

Aircraft Certification Service. 

[FR Doc. 2021–19847 Filed 9–15–21; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2021–0306; Project 

Identifier MCAI–2020–01493–E; Amendment 

39–21706; AD 2021–18–05] 

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 superseding 

Airworthiness Directive (AD) 2020–15– 

12 for certain Rolls-Royce Deutschland 

Ltd & Co KG (RRD) Trent 1000 model 

turbofan engines. AD 2020–15–12 

required initial and repetitive ultrasonic 

or visual inspections of the 

intermediate-pressure compressor (IPC) 

stage 1 rotor blade root (front face), IPC 

stage 2 rotor blade root (front and rear 

face), and IPC shaft stage 2 dovetail post 

(front face), and removal of any cracked 

parts from service. AD 2020–15–12 also 

required an inspection after asymmetric 

power and cabin depressurization 

events. This AD was prompted by IPC 

rotor blade separations resulting in 

engine failures. This AD requires initial 

and repetitive ultrasonic or visual 

inspections of certain IPC stage 1 rotor 

blade root, IPC stage 2 rotor blade root, 

and IPC shaft stage 2 dovetail posts until 

replacement of the IPC stage 1 and stage 

2 rotor blades with redesigned IPC stage 

1 and stage 2 rotor blades in kitted sets. 

The FAA is issuing this AD to address 

the unsafe condition on these products. 

DATES: This AD is effective October 21, 

2021. 

The Director of the Federal Register 

approved the incorporation by reference 

of certain publications listed in this AD 

as of October 21, 2021. 

Federal Register / Vol. 86, No. 177 / Thursday, September 16, 2021 / Rules and Regulations 51601 

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 (781) 238– 

7759. It is also available at https://

www.regulations.gov by searching for 

and locating Docket No. FAA–2021– 

0306. 

Examining the AD Docket 

You may examine the AD docket at 

https://www.regulations.gov by 

searching for and locating Docket No. 

FAA–2021–0306; 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: 

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 notice of proposed 

rulemaking (NPRM) to amend 14 CFR 

part 39 to supersede AD 2020–15–12, 

Amendment 39–21175 (85 FR 45081, 

July 27, 2020), (AD 2020–15–12). AD 

2020–15–12 applied to certain RRD 

Trent 1000–A2, Trent 1000–AE2, Trent 

1000–C2, Trent 1000–CE2, Trent 1000– 

D2, Trent 1000–E2, Trent 1000–G2, 

Trent 1000–H2, Trent 1000–J2, Trent 

1000–K2, and Trent 1000–L2 model 

turbofan engines. The NPRM published 

in the Federal Register on April 22, 

2021 (86 FR 21233). The NPRM was 

prompted by IPC rotor blade separations 

resulting in engine failures. 

Subsequently, the manufacturer 

identified the need to add new 

inspections and an optional terminating 

action, amend the asymmetric power 

condition for engine inspection, and to 

add an inspection after a cabin 

depressurization event. In the NPRM, 

the FAA proposed to continue to require 

initial and repetitive ultrasonic or visual 

inspection of the IPC stage 1 rotor blade 

root (front face), IPC stage 2 rotor blade 

root (front and rear face), and IPC shaft 

stage 2 dovetail post (front face), 

removal of any cracked parts from 

service, and an inspection after 

asymmetric power and cabin 

depressurization events until the 

installation of the IPC stage 1 and stage 

2 rotor blades with the IPC stage 1 and 

stage 2 rotor blades in kitted sets. 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 Community, has issued EASA 

AD 2020–0240, dated November 5, 2020 

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

address the unsafe condition on these 

products. The MCAI states: 

Occurrences were reported on Rolls-Royce 

Trent 1000 ‘Pack C’ engines, where some IPC 

Rotor 1 and Rotor 2 blades were found 

cracked. 

This condition, if not detected and 

corrected, could lead to in-flight blade 

release, possibly resulting in reduced control 

of the aeroplane. 

To address this potential unsafe condition, 

Rolls-Royce initially issued Alert NMSB 

TRENT 1000 72–AJ814 and 72–AJ819 to 

provide inspection instructions for IPC Rotor 

1 blades, and IPC Rotor 2 blades and IPC 

shaft Stage 2 dovetail posts, respectively. 

Rolls-Royce also issued NMSB TRENT 1000 

72–J871 to provide rework instructions for 

the affected parts, and Alert NMSB TRENT 

1000 72–AJ869 to inspect those post-rework 

parts. Consequently, EASA issued AD 2017– 

0248 to require repetitive inspections of the 

affected IPC Rotor blades and IPC shaft Stage 

2 dovetail posts and, depending on findings, 

removal from service of the engine for 

corrective action. 

After that [EASA] AD was issued, RollsRoyce issued Alert NMSB TRENT 1000 72– 

AK058 to provide instructions for a one-time 

on-wing inspection. Consequently, EASA 

issued AD 2018–0073, retaining the 

requirements of EASA AD 2017–0248, which 

was superseded, to require an additional 

borescope inspection of certain engines and, 

depending on findings, removal from service 

of the engine for corrective action. 

After that [EASA] AD was issued, it was 

determined that repetitive borescope 

inspections are necessary on all engines to 

ensure fleet-wide continued safe operation. 

Consequently, Rolls-Royce revised Alert 

NMSB TRENT 1000 72–AJ869, Alert NMSB 

TRENT 1000 72–AJ814, Alert NMSB TRENT 

1000 72–AJ819 and NMSB TRENT 1000 72– 

J871, and issued NMSB TRENT 1000 72– 

AK060 to consolidate all inspection 

instructions. Consequently, EASA issued AD 

2018–0084 (later revised), retaining the 

requirements of EASA AD 2018–0073, which 

was superseded, and requiring repetitive onwing borescope inspections of the affected 

Rotor 1 parts and affected Rotor 2 parts and, 

depending on findings, removal from service 

of the engine for corrective action. That 

[EASA] AD also introduced specific 

requirements for engines installed on 

aeroplanes involved in ETOPS, and 

inspection following operation in asymmetric 

power conditions. 

Rolls-Royce then introduced NMSB Trent 

1000 72–AK092 to provide inspections for 

the rear face of the Rotor 2 blades and NMSB 

TRENT 1000 72–AK060 was revised (R1) 

accordingly. Later, Rolls-Royce developed 

mod 72–J941, installing improved IPC Stage 

1 and Stage 2 rotor blades, and issued the 

modification SB, providing the necessary 

instructions for in-service application. EASA 

issued AD 2018–0084R2 to exclude post-mod 

72–J941 engines from the Applicability and 

introducing the modification SB as 

terminating action for the repetitive 

inspections as required by that [EASA] AD. 

After that [EASA] AD was issued, RollsRoyce issued NMSB TRENT 1000 72–AK313 

and revised Alert NMSB TRENT 1000 72– 

AJ814, 72–AJ819 and 72–AK092 to introduce 

new inspections, new thresholds and new 

intervals, depending on engine configuration. 

These inspections are for all operations, 

ETOPS and non-ETOPS. The latest revision 

of the NMSB also amended the asymmetric 

power conditions for engine inspection and 

introduced cabin depressurisation as an 

event to trigger engine inspection(s). 

Consequently, EASA issued AD 2019–0250 

to require introduction of the new 

inspections, replacing those previously 

imposed by EASA AD 2018–0084R2 (through 

NMSB TRENT 1000 72–AK060), and to 

remove the references to Engine Health 

Monitoring messages and ETOPS-related 

requirements. 

Since that [EASA] AD was issued, it was 

discovered that the manufacturing 

distribution of the individual blade 

frequencies could differ from the assumed 

values during certification of the SB TRENT 

1000 72–J941, which means there may not be 

sufficient margin to prevent the blades from 

experiencing high vibration levels. Prompted 

by these findings, Rolls-Royce issued the 

modification SB to provide blade kitting 

instructions. 

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–2021–0306. 

Discussion of Final Airworthiness 

Directive 

Comments 

The FAA received comments from 1 

commenter. The commenter was The 

Boeing Company (Boeing). Boeing 

supported the NPRM without change. 

Conclusion 

The FAA reviewed the relevant data, 

considered the comment received, and 

determined that air safety requires 

adopting the AD as proposed. 

Accordingly, the FAA is issuing this AD 

to address the unsafe condition on these 

products. Except for minor editorial 

changes, this AD is adopted as proposed 

in the NPRM. 

51602 Federal Register / Vol. 86, No. 177 / Thursday, September 16, 2021 / Rules and Regulations 

Related Service Information Under 1 

CFR Part 51 

The FAA reviewed Rolls-Royce Alert 

Non-Modification Service Bulletin 

(NMSB) Trent 1000 72–AK313, Revision 

1, dated August 22, 2019; and RollsRoyce Alert Service Bulletin (SB) Trent 

1000 72–AK430, Initial Issue, dated 

August 17, 2020. Rolls-Royce Alert 

NMSB Trent 1000 72–AK313 defines 

the initial inspection threshold and 

repeat inspection intervals for Trent 

1000 IPC stage 1 rotor blade, IPC stage 

2 rotor blade, and IPC shaft stage 2 

dovetail posts. Rolls-Royce Alert SB 

Trent 1000 72–AK430 introduces the 

IPC stage 1 and stage 2 rotor blades in 

kitted sets and provides kitting 

instructions. 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. 

Other Related Service Information 

The FAA reviewed Rolls-Royce Alert 

NMSB Trent 1000 72–AJ814, Revision 5, 

dated May 3, 2019; Rolls-Royce Alert 

NMSB Trent 1000 72–AJ819, Revision 4, 

dated May 3, 2019; Rolls-Royce Alert 

NMSB Trent 1000 72–AK092, Revision 

4, dated May 3, 2019; Rolls-Royce SB 

Trent 1000 72–J871, Revision 6, dated 

December 12, 2019; and Rolls-Royce SB 

Trent 1000 72–J941, Revision 1, dated 

February 6, 2019. 

Rolls-Royce Alert NMSB Trent 1000 

72–AJ814 describes procedures for 

performing an ultrasonic inspection 

(USI) of the IPC stage 1 rotor blades. 

Rolls-Royce Alert NMSB Trent 1000 72– 

AJ819 describes procedures for 

performing a visual borescope 

inspection of the IPC stage 2 rotor 

blades and IPC shaft stage 2 dovetail 

posts. Rolls-Royce Alert NMSB Trent 

1000 72–AK092 describes procedures 

for performing a USI of the IPC stage 2 

rotor blades. Rolls-Royce SB Trent 1000 

72–J871 describes procedures for 

reworking or replacing the affected 

parts. Rolls-Royce SB Trent 1000 72– 

J941 specifies procedures for installing 

the redesigned IPC stage 1 and stage 2 

rotor blades. 

Costs of Compliance 

The FAA estimates that this AD 

affects 7 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 the IPC stage 1 rotor blade root 

(Front Face).

20 work-hours × $85 per hour = $1,700 ........ $0 $1,700 $11,900 

Inspect the IPC stage 2 rotor blade root 

(Front Face) and IPC shaft stage 2 dovetail 

post (Front Face).

6 work-hours × $85 per hour = $510 ............. 0 510 3,570 

Inspect the IPC stage 2 rotor blade root 

(Rear Face).

10 work-hours × $85 per hour = $850 ........... 0 850 5,950 

Replace all 34 IPC stage 1 rotor blades 

(mandatory terminating action).

280 work-hours × $85 per hour = $23,800 .... 52,360 76,160 533,120 

Replace all 49 IPC stage 2 rotor blades 

(mandatory terminating action).

280 work-hours × $85 per hour = $23,800 .... 48,755 72,555 507,885 

The FAA estimates the following 

costs to do any necessary replacements 

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 these 

replacements: 

ON-CONDITION COSTS

Action Labor cost Parts cost Cost per 

product 

Replace all 34 IPC stage 1 rotor blades ...................... 280 work-hours × $85 per hour = $23,800 .................. $52,360 $76,160 

Replace all 49 IPC stage 2 rotor blades ...................... 280 work-hours × $85 per hour = $23,800 .................. 48,755 72,555 

Replace the IPC drum assembly ................................. 144 work-hours × $85 per hour = $12,240 .................. 1,370,000 1,382,240 

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 has determined that 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. 

Federal Register / Vol. 86, No. 177 / Thursday, September 16, 2021 / Rules and Regulations 51603 

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: 

■ a. Removing Airworthiness Directive 

AD 2020–15–12, Amendment 39–21175 

(85 FR 45081, July 27, 2020); and 

■ b. Adding the following new 

airworthiness directive: 

2021–18–05 Rolls-Royce Deutschland Ltd & 

Co KG (Type Certificate previously held 

by Rolls-Royce plc): Amendment 39– 

21706; Docket No. FAA–2021–0306; 

Project Identifier MCAI–2020–01493–E. 

(a) Effective Date 

This airworthiness directive (AD) is 

effective October 21, 2021. 

(b) Affected ADs 

This AD replaces AD 2020–15–12, 

Amendment 39–21175 (85 FR 45081, July 27, 

2020). 

(c) Applicability 

This AD applies to Rolls-Royce 

Deutschland Ltd & Co KG (Type Certificate 

previously held by Rolls-Royce plc) Trent 

1000–A2, Trent 1000–AE2, Trent 1000–C2, 

Trent 1000–CE2, Trent 1000–D2, Trent 1000– 

E2, Trent 1000–G2, Trent 1000–H2, Trent 

1000–J2, Trent 1000–K2, and Trent 1000–L2 

model turbofan engines, except those that 

have the redesigned intermediate-pressure 

compressor (IPC) stage 1 and stage 2 rotor 

blades introduced by Rolls-Royce (RR) 

Service Bulletin (SB) Trent 1000 72–J941, 

Initial Issue, dated December 6, 2016, or 

Revision 1, dated February 6, 2019. 

(d) Subject 

Joint Aircraft System Component (JASC) 

Code 7230, Turbine Engine Compressor 

Section. 

(e) Unsafe Condition 

This AD was prompted by IPC rotor blade 

separations resulting in engine failures. The 

FAA is issuing this AD to prevent failure of 

the IPC. 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 

(1) After the effective date of this AD, 

before exceeding the initial inspection 

thresholds and repeat inspection intervals 

specified in Table 1 of RR Alert NonModification Service Bulletin (NMSB) Trent 

1000 72–AK313, Revision 1, dated August 

22, 2019 (RR NMSB Trent 1000 72–AK313 

R1): 

(i) Perform initial ultrasonic inspections 

(USIs) of the IPC stage 1 rotor blade root 

(front face). 

(ii) Thereafter, perform repetitive USIs of 

the IPC stage 1 rotor blade root (front face). 

(iii) Use the Accomplishment Instructions, 

paragraph 3.A.(1)(a) (on-wing) or 3.A.(2)(a) 

and (b) (in-shop), of RR NMSB Trent 1000 

72–AK313 R1 to perform the inspections. 

(2) After the effective date of this AD, 

before exceeding the initial inspection 

thresholds and repeat inspection intervals 

specified in Table 2 of RR NMSB Trent 1000 

72–AK313 R1: 

(i) Perform initial visual inspections of the 

IPC stage 2 rotor blade root (front face) and 

IPC shaft stage 2 dovetail post (front face). 

(ii) Thereafter, perform repetitive visual 

inspections of the IPC stage 2 rotor blade root 

(front face) and IPC shaft stage 2 dovetail post 

(front face). 

(iii) Use the Accomplishment Instructions, 

paragraph 3.B.(1)(a) (on-wing) or 3.B.(2)(b) 

(in-shop), of RR NMSB Trent 1000 72–AK313 

R1 to perform the inspections. 

(3) After the effective date of this AD, 

before exceeding the initial inspection 

threshold and repeat inspection intervals 

specified in Table 2 of RR NMSB Trent 1000 

72–AK313 R1: 

(i) Perform initial USIs of IPC stage 2 rotor 

blade root (rear face). 

(ii) Thereafter, perform repetitive USIs of 

IPC stage 2 rotor blade root (rear face). 

(iii) Use the Accomplishment Instructions, 

paragraph 3.C.(1)(a) (on-wing) or 3.C.(2)(a) 

(in-shop), of RR NMSB Trent 1000 72–AK313 

R1 to perform the inspections. 

(4) After the effective date of this AD, 

within 5 engine flight cycles (FCs) after each 

occurrence in which any engine operates in 

asymmetric power conditions at an altitude 

of less than 28,000 feet, perform the 

following inspections on the engine not 

affected by the power reduction or in-flight 

shutdown (IFSD): 

(i) Perform initial USIs and visual 

inspections required by paragraphs (g)(1) 

through (3) of this AD. 

(ii) Thereafter, perform the repetitive USIs 

and visual inspections required by 

paragraphs (g)(1) through (3) of this AD. 

(iii) Use the service information and 

repetitive inspection thresholds required by 

paragraphs (g)(1)(iii), (2)(iii), and (3)(iii) to 

perform the inspections, as applicable. 

(5) After the effective date of this AD, 

within 5 engine FCs following a cabin 

depressurization event, perform the 

following inspections on both engines 

installed on the airplane: 

(i) Perform initial USIs and visual 

inspections required by paragraphs (g)(1) 

through (3) of this AD. 

(ii) Thereafter, perform the repetitive USIs 

and visual inspections required by 

paragraphs (g)(1) through (3) of this AD. 

(iii) Use the service information and 

repetitive inspection thresholds required by 

paragraphs (g)(1)(iii), (2)(iii), and (3)(iii) to 

perform the inspections, as applicable. 

(6) If any IPC stage 1 rotor blade root (front 

face), IPC stage 2 rotor blade root (front face), 

or IPC stage 2 rotor blade root (rear face) is 

found cracked during any inspection 

required by this AD, replace the part with a 

part eligible for installation before further 

flight. 

(7) If any IPC shaft stage 2 dovetail post 

(front face) is found cracked during any 

inspection required by this AD, replace the 

IPC drum assembly. 

(h) Mandatory Terminating Action 

At the next engine shop visit after the 

effective date of this AD, replace the IPC 

stage 1 and stage 2 rotor blades with 

redesigned IPC stage 1 and stage 2 rotor 

blades introduced by RR SB Trent 1000 72– 

J941, Revision 1, dated February 6, 2019. 

Install the blades as kitted sets using the 

Accomplishment Instructions, paragraph 3.C. 

(In-Shop), of RR Alert SB Trent 1000 72– 

AK430, Initial Issue, dated August 17, 2020. 

This replacement of the IPC stage 1 and stage 

2 rotor blades as kitted sets is a terminating 

action for the initial and repetitive ultrasonic 

or visual inspection requirements, as 

applicable, required by paragraphs (g)(1) 

through (5) of this AD. 

(i) Definitions 

(1) For the purpose of this AD, an 

‘‘asymmetric power condition’’ is the 

operation of the airplane at an altitude of less 

than 28,000 feet, experiencing either single 

engine take-off, engine fault (reduced power 

on one engine), or single engine IFSD, which 

includes execution of any non-normal 

checklist procedure. 

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

shop visit’’ is the induction of an engine into 

the shop for maintenance involving the 

separation of pairs of major mating engine 

case flanges, except that the separation of 

engine flanges solely for the purposes of 

transportation without subsequent engine 

maintenance does not constitute an engine 

shop visit. 

(j) Credit for Previous Actions 

You may take credit for the initial 

inspections required by paragraphs (g)(1) 

through (5) of this AD if you performed these 

inspections before the effective date of this 

AD using any of the following. 

(1) RR Alert NMSB Trent 1000 72–AJ819, 

Revision 3, dated April 13, 2018, or earlier 

revisions; 

(2) RR Alert NMSB Trent 1000 72–AJ814, 

Revision 4, dated September 28, 2018, or 

earlier revisions; 

(3) RR Alert NMSB Trent 1000 72–AK313, 

Initial Issue, dated May 2, 2019; or 

(4) RR Alert NMSB Trent 1000 72–AK092, 

Revision 3, dated February 28, 2019, or 

earlier revisions. 

(k) Special Flight Permit 

A special flight permit may be issued in 

accordance with 14 CFR 21.197 and 21.199 

to permit a one-time non-revenue ferry flight 

to a location where the engine can be 

removed from service for operators who are 

51604 Federal Register / Vol. 86, No. 177 / Thursday, September 16, 2021 / Rules and Regulations 

prohibited from further flight due to a crack 

finding as a result of paragraph (g) of this AD. 

This ferry flight must be performed without 

passengers, involve non-ETOPS operation, 

and consume no more than three FCs. 

(l) 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. 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. 

(m) 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 2020–0240, dated 

November 5, 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–2021–0306. 

(n) 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 72–AK313, 

Revision 1, dated August 22, 2019. 

(ii) Rolls-Royce Alert Service Bulletin 

Trent 1000 72–AK430, Initial Issue, dated 

August 17, 2020. 

(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 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. 

(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 August 23, 2021. 

Gaetano A. Sciortino, 

Deputy Director for Strategic Initiatives, 

Compliance & Airworthiness Division, 

Aircraft Certification Service. 

[FR Doc. 2021–19982 Filed 9–15–21; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2021–0790; Project 

Identifier MCAI–2021–01007–T; Amendment 

39–21738; AD 2021–19–20] 

RIN 2120–AA64 

Airworthiness Directives; Dassault 

Aviation Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule; request for 

comments. 

SUMMARY: The FAA is adopting a new 

airworthiness directive (AD) for all 

Dassault Aviation Model FALCON 7X 

airplanes. This AD was prompted by a 

report of defects on the piston hole 

associated with the O2 saver feature that 

may prevent efficient deactivation of the 

O2 saver function. This AD requires 

amending the existing airplane flight 

manual (AFM) to incorporate a check 

and an operating limitation regarding 

the O2 saver function, as specified in a 

European Union Aviation Safety Agency 

(EASA) AD, which is incorporated by 

reference. This AD also limits the 

installation of affected parts under 

certain conditions. The FAA is issuing 

this AD to address the unsafe condition 

on these products. 

DATES: This AD becomes effective 

September 16, 2021. 

The Director of the Federal Register 

approved the incorporation by reference 

of a certain publications listed in this 

AD as of September 16, 2021. 

The FAA must receive comments on 

this AD by November 1, 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 material incorporated by reference 

(IBR) in this AD, contact EASA, KonradAdenauer-Ufer 3, 50668 Cologne, 

Germany; telephone +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, 

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 in the AD docket at 

https://www.regulations.gov by 

searching for and locating Docket No. 

FAA–2021–0790. 

Examining the AD Docket 

You may examine the AD docket at 

https://www.regulations.gov by 

searching for and locating Docket No. 

FAA–2021–0790; 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 

AD, 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: Tom 

Rodriguez, Aerospace Engineer, Large 

Aircraft Section, FAA, International 

Validation Branch, 2200 South 216th 

St., Des Moines, WA 98198; telephone 

and fax 206–231–3226; email 

Tom.Rodriguez@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Comments Invited 

The FAA invites you to send any 

written data, views, or arguments about 

this final rule. Send your comments to 

an address listed under ADDRESSES. 

Include ‘‘Docket No. FAA–2021–0790; 

Project Identifier MCAI–2021–01007–T’’ 

at the beginning of your comments. The 

most helpful comments reference a 

specific portion of the final rule, 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 final rule 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