1664 Federal Register / Vol. 87, No. 8 / Wednesday, January 12, 2022 / Rules and Regulations 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2021–1182; Project 

Identifier AD–2021–01393–E; Amendment 

39–21902; AD 2022–02–05] 

RIN 2120–AA64 

Airworthiness Directives; Pratt & 

Whitney Turbofan Engines 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule; request for 

comments. 

SUMMARY: The FAA is adopting a new 

airworthiness directive (AD) for certain 

Pratt & Whitney (P&W) PW1500G and 

PW1900G model turbofan engines. This 

AD was prompted by an analysis of an 

event involving an International Aero 

Engines AG (IAE) V2533–A5 model 

turbofan engine, which experienced an 

uncontained failure of a high-pressure 

turbine (HPT) 1st-stage disk that 

resulted in high-energy debris 

penetrating the engine cowling. This AD 

requires removing certain HPT 1st-stage 

and HPT 2nd-stage disks from service 

and replacing with parts eligible for 

installation. The FAA is issuing this AD 

to address the unsafe condition on these 

products. 

DATES: This AD is effective January 27, 

2022. 

The FAA must receive comments on 

this AD by February 28, 2022. 

ADDRESSES: You may send comments, 

using the procedures found in 14 CFR 

11.43 and 11.45, by any of the following 

methods: 

• Federal eRulemaking Portal: Go to 

https://www.regulations.gov. Follow the 

instructions for submitting comments. 

• Fax: (202) 493–2251. 

• Mail: U.S. Department of 

Transportation, Docket Operations, M– 

30, West Building Ground Floor, Room 

W12–140, 1200 New Jersey Avenue SE, 

Washington, DC 20590. 

• Hand Delivery: Deliver to Mail 

address above between 9 a.m. and 5 

p.m., Monday through Friday, except 

Federal holidays. 

For service information identified in 

this final rule, contact Pratt & Whitney, 

400 Main Street, East Hartford, CT 

06118; phone: (800) 565–0140; email: 

help24@prattwhitney.com; website: 

https://fleetcare.prattwhitney.com. You 

may view this 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 (817) 222– 

5110. 

Examining the AD Docket 

You may examine the AD docket at 

https://www.regulations.gov by 

searching for and locating Docket No. 

FAA–2021–1182; or in person at Docket 

Operations between 9 a.m. and 5 p.m., 

Monday through Friday, except Federal 

holidays. The AD docket contains this 

final rule, any comments received, and 

other information. The street address for 

the Docket Operations is listed above. 

FOR FURTHER INFORMATION CONTACT: 

Mark Taylor, Aviation Safety Engineer, 

ECO Branch, FAA, 1200 District 

Avenue, Burlington, MA 01803; phone: 

(781) 238–7229; fax: (781) 238–7199; 

email: Mark.Taylor@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Background 

On March 18, 2020, an Airbus Model 

A321–231 airplane, powered by IAE 

V2533–A5 model turbofan engines, 

experienced an uncontained HPT 1ststage disk failure that resulted in highenergy debris penetrating the engine 

cowling. Based on a preliminary 

analysis of this event, on March 21, 

2020, the FAA issued Emergency AD 

2020–07–51 (followed by publication in 

the Federal Register on April 13, 2020, 

as a Final Rule, Request for Comments 

(85 FR 20402)), which requires the 

removal from service of certain HPT 1ststage disks installed on IAE V2522–A5, 

V2524–A5, V2525–D5, V2527–A5, 

V2527E–A5, V2527M–A5, V2528–D5, 

V2530–A5, and V2533–A5 model 

turbofan engines. 

Since the FAA issued AD 2020–07– 

51, P&W determined that the failure of 

the IAE V2533–A5 model turbofan 

engine was due to an undetected 

subsurface material defect in an HPT 

disk that may affect the life of the part. 

In June 2021, P&W expanded its root 

cause analysis to include a review of 

records for all other IAE and P&W 

engines that contain parts of similar 

material. 

P&W’s analysis identified a different 

population of HPT 1st-stage and HPT 

2nd-stage disks installed on P&W 

PW1519G, PW1521G, PW1521G–3, 

PW1521GA, PW1524G, PW1524G–3, 

PW1525G, and PW1525G–3 (PW1500G) 

model turbofan engines, and P&W 

PW1919G, PW1921G, PW1922G, 

PW1923G, and PW1923G–A (PW1900G) 

model turbofan engines that are subject 

to the same unsafe condition identified 

in AD 2020–07–51 and require removal 

from service. This condition, if not 

addressed, could result in uncontained 

HPT disk failure, release of high-energy 

debris, damage to the engine, damage to 

the airplane, and loss of the airplane. 

The FAA is issuing this AD to address 

the unsafe condition on these products. 

FAA’s Determination 

The FAA is issuing this AD because 

the agency has determined the unsafe 

condition described previously is likely 

to exist or develop in other products of 

the same type design. 

Related Service Information 

The FAA reviewed Pratt & Whitney 

Special Instruction (SI) No. 225F–21, 

dated December 1, 2021. This SI 

describes procedures for removing and 

replacing the affected HPT 1st-stage and 

HPT 2nd-stage disks, identified by part 

number (P/N) and serial number (S/N), 

installed on PW1500G model turbofan 

engines. 

The FAA reviewed Pratt & Whitney SI 

No. 226F–21, dated December 1, 2021. 

This SI describes procedures for 

removing and replacing the affected 

HPT 1st-stage and HPT 2nd-stage disks, 

identified by P/N and S/N, installed on 

PW1900G model turbofan engines. 

AD Requirements 

This AD requires the removal from 

service of certain HPT 1st-stage and 

HPT 2nd-stage disks installed on 

PW1500G and PW1900G model 

turbofan engines. 

Justification for Immediate Adoption 

and Determination of the Effective Date 

Section 553(b)(3)(B) of the 

Administrative Procedure Act (APA) (5 

U.S.C. 551 et seq.) authorizes agencies 

to dispense with notice and comment 

procedures for rules when the agency, 

for ‘‘good cause,’’ finds that those 

procedures are ‘‘impracticable, 

unnecessary, or contrary to the public 

interest.’’ Under this section, an agency, 

upon finding good cause, may issue a 

final rule without providing notice and 

seeking comment prior to issuance. 

Further, section 553(d) of the APA 

authorizes agencies to make rules 

effective in less than thirty days, upon 

a finding of good cause. 

An unsafe condition exists that 

requires the immediate adoption of this 

AD without providing an opportunity 

for public comments prior to adoption. 

The FAA has found that the risk to the 

flying public justifies foregoing notice 

and comment prior to adoption of this 

rule. On March 18, 2020, an Airbus 

Model A321–231 airplane, powered by 

IAE V2533–A5 model turbofan engines, 

experienced an uncontained HPT 1ststage disk failure that resulted in highenergy debris penetrating the engine 

cowling. Based on a preliminary 


lotter on DSK11XQN23PROD with RULES1
Federal Register / Vol. 87, No. 8 / Wednesday, January 12, 2022 / Rules and Regulations 1665 

analysis of this event, on March 21, 

2020, the FAA issued Emergency AD 

2020–07–51 (followed by publication in 

the Federal Register on April 13, 2020, 

as a Final Rule, Request for Comments 

(85 FR 20402)), which requires the 

removal from service of certain HPT 1ststage disks installed on IAE V2522–A5, 

V2524–A5, V2525–D5, V2527–A5, 

V2527E–A5, V2527M–A5, V2528–D5, 

V2530–A5, and V2533–A5 model 

turbofan engines. Since the FAA issued 

AD 2020–07–51, the manufacturer 

conducted a root cause analysis and 

identified a different population of HPT 

1st-stage and HPT 2nd-stage disks 

installed on P&W PW1500G and 

PW1900G model turbofan engines that 

are subject to the same unsafe condition 

identified in AD 2020–07–51. The FAA 

considers removal of the affected HPT 

1st-stage and HPT 2nd-stage disks to be 

an urgent safety issue. These HPT disks 

have the highest risk of failure and 

removal is required within 30 days after 

the effective date of this AD to prevent 

additional HPT disk failures and 

maintain an acceptable level of safety. 

This unsafe condition, if not addressed, 

could result in uncontained HPT disk 

failure, release of high-energy debris, 

damage to the engine, damage to the 

airplane, and loss of the airplane. 

Accordingly, notice and opportunity for 

prior public comment are impracticable 

and contrary to the public interest 

pursuant to 5 U.S.C. 553(b)(3)(B). 

In addition, the FAA finds that good 

cause exists pursuant to 5 U.S.C. 553(d) 

for making this amendment effective in 

less than 30 days, for the same reasons 

the FAA found good cause to forego 

notice and comment. 

Comments Invited 

The FAA invites you to send any 

written data, views, or arguments about 

this final rule. Send your comments to 

an address listed under ADDRESSES. 

Include ‘‘Docket No. FAA–2021–1182 

and Project Identifier AD–2021–01393– 

E’’ at the beginning of your comments. 

The most helpful comments reference a 

specific portion of the final rule, explain 

the reason for any recommended 

change, and include supporting data. 

The FAA will consider all comments 

received by the closing date and may 

amend this final rule because of those 

comments. 

Except for Confidential Business 

Information (CBI) as described in the 

following paragraph, and other 

information as described in 14 CFR 

11.35, the FAA will post all comments 

received, without change, to https://

www.regulations.gov, including any 

personal information you provide. The 

agency will also post a report 

summarizing each substantive verbal 

contact received about this final rule. 

Confidential Business Information 

CBI is commercial or financial 

information that is both customarily and 

actually treated as private by its owner. 

Under the Freedom of Information Act 

(FOIA) (5 U.S.C. 552), CBI is exempt 

from public disclosure. If your 

comments responsive to this AD contain 

commercial or financial information 

that is customarily treated as private, 

that you actually treat as private, and 

that is relevant or responsive to this AD, 

it is important that you clearly designate 

the submitted comments as CBI. Please 

mark each page of your submission 

containing CBI as ‘‘PROPIN.’’ The FAA 

will treat such marked submissions as 

confidential under the FOIA, and they 

will not be placed in the public docket 

of this AD. Submissions containing CBI 

should be sent to Mark Taylor, Aviation 

Safety Engineer, ECO Branch, FAA, 

1200 District Avenue, Burlington, MA 

01803. Any commentary that the FAA 

receives which is not specifically 

designated as CBI will be placed in the 

public docket for this rulemaking. 

Regulatory Flexibility Act 

The requirements of the Regulatory 

Flexibility Act (RFA) do not apply when 

an agency finds good cause pursuant to 

5 U.S.C. 553 to adopt a rule without 

prior notice and comment. Because FAA 

has determined that it has good cause to 

adopt this rule without prior notice and 

comment, RFA analysis is not required. 

Costs of Compliance 

The FAA estimates that this AD 

affects 8 engines installed on airplanes 

of U.S. registry. 

The FAA estimates the following 

costs to comply with this AD: 

ESTIMATED COSTS

Action Labor cost Parts cost Cost per 

product 

Cost on U.S. 

operators 

Replace HPT 1st-stage or HPT 2nd-stage 

disk.

316 work-hours × $85 per hour = $26,860 .... $121,516 $148,376 $1,187,008 

Authority for This Rulemaking 

Title 49 of the United States Code 

specifies the FAA’s authority to issue 

rules on aviation safety. Subtitle I, 

section 106, describes the authority of 

the FAA Administrator. Subtitle VII: 

Aviation Programs describes in more 

detail the scope of the Agency’s 

authority. 

The FAA is issuing this rulemaking 

under the authority described in 

Subtitle VII, Part A, Subpart III, Section 

44701: General requirements. Under 

that section, Congress charges the FAA 

with promoting safe flight of civil 

aircraft in air commerce by prescribing 

regulations for practices, methods, and 

procedures the Administrator finds 

necessary for safety in air commerce. 

This regulation is within the scope of 

that authority because it addresses an 

unsafe condition that is likely to exist or 

develop on products identified in this 

rulemaking action. 

Regulatory Findings 

This AD will not have federalism 

implications under Executive Order 

13132. This AD will not have a 

substantial direct effect on the States, on 

the relationship between the national 

government and the States, or on the 

distribution of power and 

responsibilities among the various 

levels of government. 

For the reasons discussed above, I 

certify that this AD: 

(1) Is not a ‘‘significant regulatory 

action’’ under Executive Order 12866, 

and 

(2) Will not affect intrastate aviation 

in Alaska. 

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 39—AIRWORTHINESS 

DIRECTIVES 

■ 1. The authority citation for part 39 

continues to read as follows: 

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


lotter on DSK11XQN23PROD with RULES1
1666 Federal Register / Vol. 87, No. 8 / Wednesday, January 12, 2022 / Rules and Regulations 

§ 39.13 [Amended] 

■ 2. The FAA amends § 39.13 by adding 

the following new airworthiness 

directive: 

2022–02–05 Pratt & Whitney: Amendment 

39–21902; Docket No. FAA–2021–1182; 

Project Identifier AD–2021–01393–E. 

(a) Effective Date 

This airworthiness directive (AD) is 

effective January 27, 2022. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to Pratt & Whitney (P&W) 

PW1519G, PW1521G, PW1521G–3, 

PW1521GA, PW1524G, PW1524G–3, 

PW1525G, PW1525G–3, PW1919G, 

PW1921G, PW1922G, PW1923G, and 

PW1923G–A model turbofan engines with an 

installed: 

(1) High-pressure turbine (HPT) 1st-stage 

disk, part number (P/N) 30G5701, with serial 

number (S/N) LKLBCY9473, LKLBDG4865, 

LKLBDG4877, LKLBDG5064, LKLBDG4951, 

LKLBEH5482, LKLBCY9462, LKLBDG5142, 

LKLBFL9238, or LKLBF88737; or 

(2) HPT 2nd-stage disk, P/N 30G5002, with 

S/N LKLBCT8724, LKLBDA4633, 

LKLBDA4689, LKLBD40801, LKLBEL3603, 

LKLBD40863, LKLBCT8771, LKLBDA4691, 

LKLBEL3600, LKLBD40830, or LKLBD40845. 

(d) Subject 

Joint Aircraft System Component (JASC) 

Code 7250, Turbine Section. 

(e) Unsafe Condition 

This AD was prompted by an analysis 

performed by P&W of an event involving an 

uncontained failure of an HPT 1st-stage disk 

that resulted in high-energy debris 

penetrating the engine cowling. The FAA is 

issuing this AD to prevent failure of HPT 1ststage and HPT 2nd-stage disks. The unsafe 

condition, if not addressed, could result in 

uncontained HPT disk failure, release of 

high-energy debris, damage to the engine, 

damage to the airplane, and loss of the 

airplane. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Required Actions 

(1) For affected engines with an installed 

HPT 1st-stage disk, P/N 30G5701, having an 

S/N listed in paragraph (c)(1) of this AD, 

within 30 days after the effective date of the 

AD, remove the HPT 1st-stage disk from 

service and replace with a part eligible for 

installation. 

(2) For affected engines with an installed 

HPT 2nd-stage disk, P/N 30G5002, having an 

S/N listed in paragraph (c)(2) of this AD, 

within 30 days after the effective date of the 

AD, remove the HPT 2nd-stage disk from 

service and replace with a part eligible for 

installation. 

(h) Definition 

For the purpose of this AD, a ‘‘part eligible 

for installation’’ is an HPT 1st-stage disk or 

HPT 2nd-stage disk that is not identified in 

paragraph (c)(1) or (2) 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 paragraph (j) of this AD. 

Information may be emailed to: ANE-ADAMOC@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 Mark Taylor, Aviation Safety 

Engineer, ECO Branch, FAA, 1200 District 

Avenue, Burlington, MA 01803; phone: (781) 

238–7229; fax: (781) 238–7199; email: 

Mark.Taylor@faa.gov. 

(k) Material Incorporated by Reference 

None. 

Issued on January 6, 2022. 

Lance T. Gant, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2022–00414 Filed 1–7–22; 4:15 pm] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2021–1175; Project 

Identifier MCAI–2021–01409–G; Amendment 

39–21897; AD 2022–01–09] 

RIN 2120–AA64 

Airworthiness Directives; Stemme AG 

Gliders 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule; request for 

comments. 

SUMMARY: The FAA is adopting a new 

airworthiness directive (AD) for certain 

Stemme AG Model Stemme S 10–VT 

and Stemme S 12 gliders. This AD 

results from mandatory continuing 

airworthiness information (MCAI) 

originated by an aviation authority of 

another country to identify and correct 

an unsafe condition on an aviation 

product. The MCAI identifies the unsafe 

condition as unintended slipping of the 

freewheel clutch with overheating 

(burnishing) of the friction pads inside 

of the clutch. This AD requires 

removing the affected freewheel clutch 

from service. The FAA is issuing this 

AD to address the unsafe condition on 

these products. 

DATES: This AD is effective January 27, 

2022. 

The FAA must receive comments on 

this AD by February 28, 2022. 

ADDRESSES: You may send comments, 

using the procedures found in 14 CFR 

11.43 and 11.45, by any of the following 

methods: 

• Federal eRulemaking Portal: Go to 

https://www.regulations.gov. Follow the 

instructions for submitting comments. 

• Fax: (202) 493–2251. 

• Mail: U.S. Department of 

Transportation, Docket Operations, M– 

30, West Building Ground Floor, Room 

W12–140, 1200 New Jersey Avenue SE, 

Washington, DC 20590. 

• Hand Delivery: Deliver to Mail 

address above between 9 a.m. and 5 

p.m., Monday through Friday, except 

Federal holidays. 

For service information identified in 

this AD, contact Stemme AG, 

Flugplatzstrasse F2, Nr. 6–7, D–15344 

Strausberg, Germany; phone: +49 (0) 

3341 3612–0; fax: +49 (0) 3341 3612–30; 

email: airworthiness@stemme.de; 

website: https://www.stemme.com. You 

may view this service information at the 

FAA, Airworthiness Products Section, 

Operational Safety Branch, 901 Locust, 

Kansas City, MO 64106. For information 

on the availability of this material at the 

FAA, call (817) 222–5110. 

Examining the AD Docket 

You may examine the AD docket at 

https://www.regulations.gov by 

searching for and locating Docket No. 

FAA–2021–1175; or in person at Docket 

Operations between 9 a.m. and 5 p.m., 

Monday through Friday, except Federal 

holidays. The AD docket contains this 

final rule, the MCAI, any comments 

received, and other information. The 

street address for Docket Operations is 

listed above. 

FOR FURTHER INFORMATION CONTACT: Jim 

Rutherford, Aviation Safety Engineer, 

General Aviation & Rotorcraft Section, 

International Validation Branch, FAA, 

901 Locust, Room 301, Kansas City, MO 

64106; phone: (816) 329–4165; fax: (816) 

329–4090; email: jim.rutherford@

faa.gov. 

SUPPLEMENTARY INFORMATION: 

Discussion 

The European Union Aviation Safety 

Agency (EASA), which is the Technical 

Agent for the Member States of the 

European Union, has issued EASA AD 

2021–0278–E, dated December 15, 2021 


lotter on DSK11XQN23PROD with RULES1