Federal Register / Vol. 86, No. 44 / Tuesday, March 9, 2021 / Rules and Regulations 13447 

§ 39.13 [Amended] 

■ 2. The FAA amends § 39.13 by adding 

the following new airworthiness 

directive: 

2021–05–51 Pratt & Whitney Division: 

Amendment 39–21470; Docket No. 

FAA–2021–0136; Project Identifier AD– 

2021–00188–E. 

(a) Effective Date 

This airworthiness directive (AD) is 

effective without actual notice on March 24, 

2021. Emergency AD 2021–05–51, 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, 55A801–001, 

55A901, 55A901–001, 56A201, 56A201–001, 

or 56A221, installed. 

(d) Subject 

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. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Required Actions 

(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 (g)(1): Vendors that 

have an FAA-approved TAI inspection are 

listed in the Vendor Services Section of Pratt 

& Whitney Alert Service Bulletin PW4G– 

112–A72–268, Revision No. 7, dated 

September 6, 2018. 

(2) If any 1st-stage LPC blade fails the 

inspection required by paragraph (g)(1) 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 

passed the inspection required by paragraph 

(g)(1) of this AD. 

(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) 

238–7655; fax: (781) 238–7199; email: 

carol.nguyen@faa.gov. 

(k) Material Incorporated by Reference 

None. 

Issued on March 3, 2021. 

Gaetano A. Sciortino, 

Deputy Director for Strategic Initiatives, 

Compliance & Airworthiness Division, 

Aircraft Certification Service. 

[FR Doc. 2021–04747 Filed 3–8–21; 8:45 am] 

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DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 71 

[Docket No. FAA–2020–0871; Airspace 

Docket No. 20–AGL–32] 

RIN 2120–AA66 

Amendment of Class D and Class E 

Airspace and Revocation of Class E 

Airspace; Muskegon, MI 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule; correction. 

SUMMARY: 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 

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) 222–5711. 

SUPPLEMENTARY INFORMATION: 

History 

The FAA published a final rule in the 

Federal Register (86 FR 6243; January 

21, 2021) for FR Doc. 2021–01019 

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. 

Correction to Final Rule 

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. 2021–01019, is corrected 

as follows: 

§ 71.1 [Amended] 

■ On page 6244, column 2, line 22, 

amend to read, ‘‘. . . County Airport. 

This . . .’’ 

Issued in Fort Worth, Texas, on March 1, 

2021. 

Martin A. Skinner, 

Acting Manager, Operations Support Group 

ATO Central Service Center 

[FR Doc. 2021–04474 Filed 3–8–21; 8:45 am] 

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