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
Federal Register / Vol. 87, No. 8 / Wednesday, January 12, 2022 / Rules and Regulations 1667 

(referred to after this as ‘‘the MCAI’’), to 

address an unsafe condition on Stemme 

AG Model Stemme S10–VT and Stemme 

S12 gliders. The MCAI states: 

Occurrences have been reported of 

unintended slipping of the freewheel clutch 

(P/N 12AK) during operation and, 

subsequently, overheating (burnishing) of the 

friction pads inside of the clutch. 

This condition, if not corrected, could lead 

to total loss of thrust, possibly resulting in 

loss of control of the powered sailplane. 

Even after a successful implementation of 

the recommendations for safe operation of 

the clutch, published in Stemme AG Service 

Information P064–8900057/01, it has been 

determined that loss of thrust could occur 

without signs in advance. 

To address this potential unsafe condition, 

Stemme AG issued the SB [service bulletin], 

as defined in this AD, to provide applicable 

instructions. 

For the reasons described above, this 

[EASA] Emergency AD prohibits operation of 

certain powered sailplanes [glider], and 

prohibits installation of affected parts. 

This [EASA] AD is considered to be an 

interim action and further AD action may 

follow. 

You may examine the MCAI in the AD 

docket at https://www.regulations.gov 

by searching for and locating Docket No. 

FAA–2021–1175. 

Related Service Information 

The FAA reviewed Stemme Service 

Bulletin Doc. No. P062–980058, 

Revision 1, dated December 14, 2021. 

This service information specifies 

procedures for identifying the serial 

number of a part number (P/N) 12AK 

freewheel clutch. 

FAA’s Determination 

This product has been approved by 

the aviation authority of another 

country and is approved for operation in 

the United States. Pursuant to the FAA’s 

bilateral agreement with this State of 

Design Authority, it has notified the 

FAA of the unsafe condition described 

in the MCAI and service information 

referenced above. The FAA is issuing 

this AD after determining the unsafe 

condition is likely to exist or develop in 

other products of the same type design. 

AD Requirements 

This AD applies to gliders with a P/ 

N 12AK freewheel clutch with a serial 

number starting with ‘‘12-’’ and requires 

removing the freewheel clutch from 

service. This AD also prohibits 

installing a P/N 12AK freewheel clutch 

with a serial number starting with 

‘‘12-’’ on any glider. 

Differences Between This AD and the 

MCAI 

The MCAI applies to all Stemme AG 

Model Stemme S10–VT and Stemme 

S12 gliders and requires an inspection 

to determine whether an affected P/N 

12AK freewheel clutch is installed. This 

AD only applies to Stemme AG Model 

Stemme S 10–VT and Stemme S 12 

gliders with an affected P/N 12AK 

freewheel clutch installed. 

In addition, EASA considers its MCAI 

as interim action. The FAA does not 

identify this AD as interim action since 

there is no indication that a 

modification of the affected freewheel 

clutch is forthcoming and since this AD 

requires removing the affected clutch 

from service. 

FAA’s Justification 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 waiving notice 

and comment prior to adoption of this 

rule because unintended slipping of the 

freewheel clutch and the consequent 

overheating (burnishing) of the friction 

pads inside of the clutch could result in 

a loss of thrust and loss of glider 

control. Because this could happen 

without advance warning, the corrective 

action must be accomplished before 

further flight. 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–2021–1175 

and Project Identifier MCAI–2021– 

01409–G’’ 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 Jim Rutherford, 

Aviation Safety Engineer, FAA, General 

Aviation & Rotorcraft Section, 

International Validation Branch, 901 

Locust, Room 301, Kansas City, MO 

64106. 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 66 gliders of U.S. registry and 

estimates the following costs to comply 

with this AD: 


lotter on DSK11XQN23PROD with RULES1
1668 Federal Register / Vol. 87, No. 8 / Wednesday, January 12, 2022 / Rules and Regulations 

ESTIMATED COSTS

Action Labor cost Parts cost Cost per 

glider 

Cost on U.S. 

operators 

Remove freewheel clutch from service .......... 4 work-hours × $85 per hour = $340 ............. $500 $840 $55,440 

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. 

§ 39.13 [Amended] 

■ 2. The FAA amends § 39.13 by adding 

the following new airworthiness 

directive: 

2022–01–09 Stemme AG: Amendment 39– 

21897; Docket No. FAA–2021–1175; 

Project Identifier MCAI–2021–01409–G. 

(a) Effective Date 

This airworthiness directive (AD) is 

effective January 27, 2022. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to Stemme AG Model 

Stemme S 10–VT and Stemme S 12 gliders, 

all serial numbers, certificated in any 

category, with a freewheel clutch part 

number (P/N) 12AK with a serial number 

(S/N) starting with ‘‘12-’’ installed. 

Note 1 to paragraph (c): Stemme Service 

Bulletin Doc. No. P062–980058, Revision 1, 

dated December 14, 2021, contains guidance 

for identifying the S/N of a P/N 12AK 

freewheel clutch. 

(d) Subject 

Joint Aircraft System Component (JASC) 

Code 7100, Powerplant System. 

(e) Unsafe Condition 

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. The unsafe condition, if 

not addressed, could result in a loss of thrust 

and consequent loss of glider control. 

(f) Required Action and Compliance 

(1) Before further flight after the effective 

date of this AD, remove the freewheel clutch 

from service. 

(2) As of the effective date of this AD, do 

not install a freewheel clutch P/N 12AK with 

an S/N starting with ‘‘12-’’ on any glider. 

(g) Alternative Methods of Compliance 

(AMOCs) 

(1) The Manager, International Validation 

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 (h)(1) of this AD and 

email to: 9-AVS-AIR-730-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. 

(h) Related Information 

(1) For more information about this AD, 

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. 

(2) Refer to European Union Aviation 

Safety Agency (EASA) AD 2021–0278–E, 

dated December 15, 2021, 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–2021–1175. 

(3) 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. 

(i) Material Incorporated by Reference 

None. 

Issued on January 4, 2022. 

Lance T. Gant, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2022–00348 Filed 1–11–22; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2021–1003; Project 

Identifier AD–2021–01141–R; Amendment 

39–21899; AD 2022–02–02] 

RIN 2120–AA64 

Airworthiness Directives; Bell Textron 

Inc. (Type Certificate Previously Held 

by Bell Helicopter Textron Inc.) 

Helicopters 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: The FAA is superseding 

Airworthiness Directive (AD) 2021–15– 


lotter on DSK11XQN23PROD with RULES1