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Federal Register / Vol. 86, No. 102 / Friday, May 28, 2021 / Proposed Rules f Compliance
g Required Actions
Comply with this AD within the compliance times specified, unless already done.

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
28719

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 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
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16:44 May 27, 2021

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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.

DEPARTMENT OF TRANSPORTATION

k Related Information
RIN 2120AA64

1 For more information about this AD, contact Kevin Clark, 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 it in Docket No.
FAA20210381.
3 For service information identified in this AD, contact Rolls-Royce plc, Corporate Communications, P.O. Box 31, Derby, DE24
8BJ, United Kingdom; phone: +44 01332
242424; fax: +44 01332 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 2387759.
Issued on May 21, 2021.
Lance T. Gant, Director, Compliance & Airworthiness Division, Aircraft Certification Service.
FR Doc. 202111158 Filed 52721; 8:45 am BILLING CODE 491013P

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Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20210444; Project Identifier MCAI202001601T

Airworthiness Directives; Airbus Canada Limited Partnership Type Certificate Previously Held by C Series Aircraft Limited Partnership CSALP;
Bombardier, Inc. Airplanes Federal Aviation Administration FAA, DOT.
ACTION: Notice of proposed rulemaking NPRM.
AGENCY:

The FAA proposes to adopt a new airworthiness directive AD for certain Airbus Canada Limited Partnership Model BD5001A10 and BD5001A11 airplanes. This proposed AD was prompted by reports of wear damage found between the bonding clamps and the fuel feed tubes inside the leftand right-hand fuel tanks. This proposed AD would require repetitive inspections of the fuel feed tubes for damage, replacement if necessary, and modification of the fuel feed line installation inside the leftand righthand fuel tanks, which would terminate the repetitive inspections, as specified in a Transport Canada Civil Aviation TCCA AD, which is proposed for incorporation by reference. 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 July 12, 2021.
ADDRESSES: You may send comments, using the procedures found in 14 CFR
SUMMARY:

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28MYP1

EP28MY21.000

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 affected 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 affected IPC R1
blade having the highest flight cycles in the IPC R1 blade set since the first installation of the affected blade on an engine. When the FCs of the affected IPC R1 blade set cannot be established, use the FCs accumulated by the engine since new.