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Federal Register / Vol. 86, No. 170 / Tuesday, September 7, 2021 / Rules and Regulations
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:

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

Amended
2. The FAA amends 39.13 by adding the following new airworthiness directive:

20211711 Rolls-Royce Deutschland Ltd &
Co KG Type Certificate previously held by Rolls-Royce plc: Amendment 39
21694; Docket No. FAA20210381;
Project Identifier MCAI202001656E.
a Effective Date This airworthiness directive AD is effective October 12, 2021.
b Affected ADs None.
This AD applies to Rolls-Royce Deutschland Ltd & Co KG Type Certificate previously held by Rolls-Royce plc Trent XWB75, Trent XWB79, Trent XWB79B, and Trent XWB84 model turbofan engines with an installed intermediate-pressure compressor IPC rotor 1 R1 blade, part number P/N KH21559 affected IPC R1
blade.

1. The authority citation for part 39
continues to read as follows:

Joint Aircraft System Component JASC
Code 7230, Turbine Engine Compressor Section.
e Unsafe Condition This AD was prompted by reports of cracks in the IPC R1 blades installed on certain Trent XWB model turbofan engines. The FAA is issuing this AD to prevent failure of the IPC R1 blades. The unsafe condition, if not addressed, could result in failure of the engine, in-flight shutdown of the engine, and loss of the airplane.
f Compliance Comply with this AD within the compliance times specified, unless already done.
g Required Actions
c Applicability
PART 39AIRWORTHINESS
DIRECTIVES

d Subject
1 Within the compliance time specified in Figure 1 to paragraph g1 of this AD, perform an initial borescope inspection BSI
of the affected IPC R1 blades using the Accomplishment Instructions, paragraphs 3.A.3b and c on-wing or 3.B.2b and c in-shop, as applicable, of Rolls-Royce Non-Modification Service Bulletin Trent XWB 72K633, Initial Issue, dated August 7, 2020.

Figure 1 to Paragraph gl-Inspection threshold Flight cycles FCs since new
Compliance time
Less than 2,300 FCs since new
Before exceeding 2,300 FCs since new, or within 50 FCs after the effective date of this AD, whichever occurs later
2,300 or more FCs since new
Within 50 FCs after the effective date of this AD

h Definition For the purpose of this AD, a part eligible for installation is any IPC R1 blade having P/
N KH21559 with zero engine FCs since new, any IPC R1 blade having P/N KH21559 that has been inspected in accordance with paragraph g1 of this AD and a crack was
VerDate Sep<11>2014

16:15 Sep 03, 2021

Jkt 253001

not found, or any IPC R1 blade having a P/
N not listed in this AD.
i Credit for Previous Actions You may take credit for the initial BSI
required by paragraph g1 of this AD if you performed the initial BSI before the effective date of this AD using Rolls-Royce Alert NonModification Service Bulletin NMSB Trent XWB 72AK612, Initial Issue, dated July 9, 2020, or Rolls-Royce Alert NMSB Trent XWB
72AK613, Initial Issue, dated July 17, 2020, as applicable.
j 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
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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.
k 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
2387088; fax: 781 2387199; email:
kevin.m.clark@faa.gov.
2 Refer to European Union Aviation Safety Agency EASA AD 20200277, dated December 11, 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
20210381.
l Material Incorporated by Reference 1 The Director of the Federal Register approved the incorporation by reference
E:FRFM07SER1.SGM

07SER1

ER07SE21.001

lotter on DSK11XQN23PROD with RULES1

2 Thereafter, repeat the BSI of the affected IPC R1 blades required by paragraph g1 of this AD before exceeding 200 engine FCs since the last BSI of the IPC R1 blades.
3 If, during any inspection required by paragraph g1 or 2 of this AD, any affected IPC R1 blade is found cracked, remove all 34 IPC R1 blades from service and replace with parts eligible for installation.
Note 1 to paragraph g: The FCs specified in Figure 1 to paragraph g1 of this AD are those accumulated by the IPC R1 blade having the highest flight cycles in the IPC R1
blade set since the first installation of the blade on an engine. When the FCs of the IPC
R1 blade set cannot be established, use the FCs accumulated by the engine since new.