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Federal Register / Vol. 86, No. 44 / Tuesday, March 9, 2021 / Rules and Regulations 39.13

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

20210551 Pratt & Whitney Division:
Amendment 3921470; Docket No.
FAA20210136; Project Identifier AD
202100188E.
a Effective Date This airworthiness directive AD is effective without actual notice on March 24, 2021. Emergency AD 20210551, issued on February 23, 2021, which contained the requirements of this amendment, was effective with actual notice.
b Affected ADs None.
c Applicability This AD applies to Pratt & Whitney Division PW PW4074, PW4074D, PW4077, PW4077D, PW4084D, PW4090, and PW4090
3 model turbofan engines, with a 1st-stage low-pressure compressor LPC blade, with part number 52A241, 55A801, 55A801001, 55A901, 55A901001, 56A201, 56A201001, or 56A221, installed.

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 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.
j Related Information For more information about this AD, contact Carol Nguyen, Aviation Safety Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803; phone: 781
2387655; fax: 781 2387199; email:
carol.nguyen@faa.gov.
k Material Incorporated by Reference
d Subject
None.

Joint Aircraft System Component JASC
Code 7230, Turbine Engine Compressor Section.
e Unsafe Condition This AD was prompted by an in-flight failure of a 1st-stage LPC blade on a PW4077
model turbofan engine resulting in an engine fire during flight. The FAA is issuing this AD
to prevent failure of the 1st-stage LPC blades.
The unsafe condition, if not addressed, could result in 1st-stage LPC blade release, damage to the engine, and damage to the airplane.

Issued on March 3, 2021.
Gaetano A. Sciortino, Deputy Director for Strategic Initiatives, Compliance & Airworthiness Division, Aircraft Certification Service.
FR Doc. 202104747 Filed 3821; 8:45 am BILLING CODE 491013P

DEPARTMENT OF TRANSPORTATION

f Compliance
Federal Aviation Administration
Comply with this AD within the compliance times specified, unless already done.

14 CFR Part 71

g Required Actions
khammond on DSKJM1Z7X2PROD with RULES

passed the inspection required by paragraph g1 of this AD.

1 Before further flight, perform a thermal acoustic image TAI inspection of the 1ststage LPC blades for cracks using a method approved by the FAA.
Note 1 to paragraph g1: Vendors that have an FAA-approved TAI inspection are listed in the Vendor Services Section of Pratt & Whitney Alert Service Bulletin PW4G
112A72268, Revision No. 7, dated September 6, 2018.
2 If any 1st-stage LPC blade fails the inspection required by paragraph g1 of this AD, remove the blade from service and replace with a part eligible for installation before further flight.
h Definition For the purpose of this AD, a part eligible for installation is a 1st-stage LPC blade that
VerDate Sep<11>2014

16:19 Mar 08, 2021

Jkt 253001

RIN 2120AA66

Amendment of Class D and Class E
Airspace and Revocation of Class E
Airspace; Muskegon, MI

The FAA published a final rule in the Federal Register 86 FR 6243; January 21, 2021 for FR Doc. 202101019
amending the Class D and Class E
airspace and revoking the Class E
airspace designated as an extension to Class D and Class E surface areas at Muskegon County Airport, Muskegon, MI. Subsequent to publication, the FAA
identified that word Airport was inadvertently omitted from the Class E
surface area airspace legal description for Muskegon County Airport. This action corrects that error.
Class E airspace designations are published in paragraph 6005 of FAA
Order 7400.11E dated July 21, 2020, and effective September 15, 2020, which is incorporated by reference in 14 CFR
71.1. The Class E airspace designations listed in this document will be subsequently published in the Order.

Sfmt 4700

Accordingly, pursuant to the authority delegated to me, Amendment of Class D and Class E Airspace and Revocation of Class E Airspace;
Muskegon, MI, published in the Federal Register of January 21, 2021 86 FR
6243, FR Doc. 202101019, is corrected as follows:
Amended
On page 6244, column 2, line 22, amend to read, . . . County Airport.
This . . .

This action corrects the final rule published in the Federal Register on January 21, 2021, amending the Class D and Class E airspace and revoking the Class E airspace designated as an extension to Class D and Class E surface areas at Muskegon County Airport, Muskegon, MI. The word Airport was
SUMMARY:

Fmt 4700

History
71.1

Federal Aviation Administration FAA, DOT.
ACTION: Final rule; correction.
AGENCY:

Frm 00005

inadvertently omitted from the Class E
surface area airspace legal description for Muskegon County Airport.
DATES: Effective date 0901 UTC, April 22, 2021. The Director of the Federal Register approves this incorporation by reference action under 1 CFR part 51, subject to the annual revision of FAA
Order 7400.11 and publication of conforming amendments.
FOR FURTHER INFORMATION CONTACT:
Jeffrey Claypool, Federal Aviation Administration, Operations Support Group, Central Service Center, 10101
Hillwood Parkway, Fort Worth, TX, 76177; telephone 817 2225711.
SUPPLEMENTARY INFORMATION:

Correction to Final Rule
Docket No. FAA20200871; Airspace Docket No. 20AGL32

PO 00000

13447

Issued in Fort Worth, Texas, on March 1, 2021.
Martin A. Skinner, Acting Manager, Operations Support Group ATO Central Service Center FR Doc. 202104474 Filed 3821; 8:45 am BILLING CODE 491013P

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