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Federal Register / Vol. 86, No. 177 / Thursday, September 16, 2021 / Rules and Regulations 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 39AIRWORTHINESS
DIRECTIVES
1. The authority citation for part 39
continues to read as follows:

Authority: 49 U.S.C. 106g, 40113, 44701.
39.13

Amended
2. The FAA amends 39.13 by:
a. Removing Airworthiness Directive AD 20201512, Amendment 3921175
85 FR 45081, July 27, 2020; and b. Adding the following new airworthiness directive:

20211805 Rolls-Royce Deutschland Ltd &
Co KG Type Certificate previously held by Rolls-Royce plc: Amendment 39
21706; Docket No. FAA20210306;
Project Identifier MCAI202001493E.
a Effective Date This airworthiness directive AD is effective October 21, 2021.
b Affected ADs This AD replaces AD 20201512, Amendment 3921175 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 1000A2, Trent 1000AE2, Trent 1000C2, Trent 1000CE2, Trent 1000D2, Trent 1000
E2, Trent 1000G2, Trent 1000H2, Trent 1000J2, Trent 1000K2, and Trent 1000L2
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 72J941, 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.

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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 72AK313, Revision 1, dated August 22, 2019 RR NMSB Trent 1000 72AK313
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.1a on-wing or 3.A.2a and b in-shop, of RR NMSB Trent 1000
72AK313 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
72AK313 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.1a on-wing or 3.B.2b in-shop, of RR NMSB Trent 1000 72AK313
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
72AK313 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.1a on-wing or 3.C.2a in-shop, of RR NMSB Trent 1000 72AK313
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 g1
through 3 of this AD.
ii Thereafter, perform the repetitive USIs and visual inspections required by paragraphs g1 through 3 of this AD.
iii Use the service information and repetitive inspection thresholds required by paragraphs g1iii, 2iii, and 3iii 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 g1
through 3 of this AD.
ii Thereafter, perform the repetitive USIs and visual inspections required by paragraphs g1 through 3 of this AD.

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iii Use the service information and repetitive inspection thresholds required by paragraphs g1iii, 2iii, and 3iii 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 g1
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 g1
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 72AJ819, Revision 3, dated April 13, 2018, or earlier revisions;
2 RR Alert NMSB Trent 1000 72AJ814, Revision 4, dated September 28, 2018, or earlier revisions;
3 RR Alert NMSB Trent 1000 72AK313, Initial Issue, dated May 2, 2019; or 4 RR Alert NMSB Trent 1000 72AK092, 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
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