Federal Register / Vol. 86, No. 105 / Thursday, June 3, 2021 / Proposed Rules 29707 

AS355F1, AS355F2, AS355N, and AS355NP 

helicopters, certificated in any category, with 

litter kits installed having any part number 

specified in paragraphs (c)(1) through (3) of 

this AD: 

(1) Part number (P/N) 350–200034 (lefthand litter kit). 

(2) P/N 350–200194 (left-hand litter kit). 

(3) P/N 350–200144 (right-hand litter kit). 

(d) Subject 

Joint Aircraft Service Component (JASC) 

Code: 6700, Rotorcraft Flight Control. 

(e) Unsafe Condition 

This AD was prompted by reports that the 

lanyards (bead chain tethers), which hold the 

quick release pins to the forward bracket 

assembly of certain litter kits, can loop 

around the directional control pedal stubs, 

limiting the movement of the pedals, which 

affect the control of the flight. The FAA is 

issuing this AD to address interference 

between the litter kit lanyards and the flight 

controls. The unsafe condition, if not 

addressed, could result in limited flight 

control movement and difficulty controlling 

the helicopter. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Required Actions 

(1) For litter kits having any part specified 

in paragraphs (c)(1) through (3) of this AD: 

Prior to each flight until the modification 

required by paragraph (g)(2) of this AD is 

accomplished, do a pre-flight check to 

determine if there is interference (e.g., 

limited movement of the pedals due to the 

lanyards that hold the quick release pins to 

the forward bracket assembly being looped 

around the directional control pedal stubs) 

between the lanyards that hold the quick 

release pins to the forward bracket assembly 

and the pedals. If interference is found, 

before further flight, do the modification 

required by paragraph (g)(2) of this AD for 

the affected litter kit. The pre-flight check 

may be performed by the owner/operator 

(pilot) holding at least a private pilot 

certificate and must be entered into the 

aircraft records showing compliance with 

this AD in accordance with § 43.9(a)(1) 

through (4) and § 91.417(a)(2)(v). The record 

must be maintained as required by § 91.417, 

§ 121.380, or § 135.439. 

(2) Within 25 hours time-in-service (TIS) 

after the effective date of this AD, modify the 

attachment location of the lanyard for litter 

kits having any part specified in paragraphs 

(c)(1) through (3) of this AD. Do the 

modification in accordance with paragraph 

3.B.2., ‘‘Procedure,’’ of the Accomplishment 

Instructions of Airbus Helicopters Service 

Bulletin SB–AHCA–128, Revision 0, dated 

March 24, 2017. 

Note 1 to paragraph (g): Litter kits, P/N 

350–200034 and P/N 350–200194, may have 

been installed under STC SR00406NY (for 

Model AS355E, AS355F, AS355F1, AS355F2, 

AS355N, and AS355NP helicopters) or STC 

SR00407NY (for Model AS350B, AS350BA, 

AS350B1, AS350B2, AS350B3, and AS350D 

helicopters). Litter kit P/N 350–200144 may 

have been installed under STC SR00458NY 

(for Model AS350BA, AS350B2, and 

AS350B3 helicopters). 

(h) Parts Installation Limitation 

As of the effective date of this AD, no 

person may install a litter kit having a part 

number identified in paragraphs (c)(1) 

through (3) of this AD, on any helicopter, 

unless the installation is modified as 

required by paragraph (g)(2) of this AD. 

(i) 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 International Validation 

Branch, send it to the attention of the person 

identified in paragraph (j)(1) of this AD. 

Information may be emailed to: 9-AVS-AIR730-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 

(1) For more information about this AD, 

contact Andrea Jimenez, Aerospace Engineer, 

COS Program Management Section, 

Operational Safety Branch, Compliance & 

Airworthiness Division, FAA, 1600 Stewart 

Ave., Mail Stop: Room 410, Westbury, NY 

11590; telephone (516) 228–7330; email 

andrea.jimenez@faa.gov. 

(2) For information about AMOCs, contact 

the Manager, International Validation 

Branch, FAA, 10101 Hillwood Pkwy., Fort 

Worth, TX 76177; telephone (817) 222–5110; 

email 9-AVS-AIR-730-AMOC@faa.gov. 

(3) For service information identified in 

this AD, contact Airbus Helicopters, 2701 

North Forum Drive, Grand Prairie, TX 75052; 

telephone (972) 641–0000 or (800) 232–0323; 

fax (972) 641–3775; or at https://

www.airbus.com/helicopters/services/ 

technical-support.html. You may view this 

referenced service information at the FAA, 

Office of the Regional Counsel, Southwest 

Region, 10101 Hillwood Pkwy., Room 6N– 

321, Fort Worth, TX 76177. For information 

on the availability of this material at the 

FAA, call (817) 222–5110. 

(4) The subject of this AD is addressed in 

Transport Canada AD CF–2017–37 dated 

December 19, 2017. You may view the 

Transport Canada AD on the internet at 

https://www.regulations.gov in Docket No. 

FAA–2021–0449. 

Issued on May 27, 2021. 

Lance T. Gant, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2021–11615 Filed 6–2–21; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2021–0447; Project 

Identifier AD–2021–00131–E] 

RIN 2120–AA64 

Airworthiness Directives; Pratt & 

Whitney Turbofan Engines 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: The FAA proposes to adopt a 

new airworthiness directive (AD) for all 

Pratt & Whitney (PW) PW1500G and 

PW1900G series turbofan engines. This 

proposed AD was prompted by reports 

of cracks in the high-pressure 

compressor (HPC) rotor shaft that 

resulted in in-flight shutdowns (IFSDs) 

and unscheduled engine removals 

(UERs). This proposed AD would 

require removal and replacement of the 

HPC front hub and HPC rotor shaft. 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 19, 2021. 

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 NPRM, contact Pratt & Whitney, 

400 Main Street, East Hartford, CT 

06118; phone: (800) 565–0140; fax: (860) 

565–5442; email: help24@pw.utc.com; 

website: https://fleetcare.pw.utc.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 (781) 238–7759. 

Examining the AD Docket 

You may examine the AD docket at 

https://www.regulations.gov by 

searching for and locating Docket No. 


khammond on DSKJM1Z7X2PROD with PROPOSALS
29708 Federal Register / Vol. 86, No. 105 / Thursday, June 3, 2021 / Proposed Rules 

FAA–2021–0447; 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 

NPRM, any comments received, and 

other information. The street address for 

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: 

Comments Invited 

The FAA invites you to send any 

written relevant data, views, or 

arguments about this proposal. Send 

your comments to an address listed 

under ADDRESSES. Include ‘‘Docket No. 

FAA–2021–0447; Project Identifier AD– 

2021–00131–E’’ at the beginning of your 

comments. The most helpful comments 

reference a specific portion of the 

proposal, 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 proposal 

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 NPRM. 

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 NPRM 

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 NPRM, 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 

NPRM. 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. 

Background 

The FAA received reports of cracks in 

the HPC rotor shaft that resulted in 

vibration and subsequent IFSDs and 

UERs. The manufacturer determined 

that the threads on the HPC rotor shaft 

were not optimized for load 

distribution, which resulted in vibration 

stresses. During one occurrence, oil was 

released at the high-pressure turbine 

(HPT) disk bore location. The 

manufacturer redesigned the HPC front 

hub and HPC rotor shaft for increased 

durability and decreased vibration 

stress. The redesigned HPC front hub is 

made from nickel to help with corrosion 

resistance. The threads on the HPC rotor 

shaft were also redesigned to help 

distribute the load on the threads and 

decrease vibration stress. This 

condition, if not addressed, could result 

in release of an HPT disk, damage to the 

engine, and damage to the airplane. 

FAA’s Determination 

The FAA is issuing this NPRM after 

determining that the unsafe condition 

described previously is likely to exist or 

develop on other products of the same 

type design. 

Related Service Information 

The FAA reviewed Pratt & Whitney 

Service Bulletin (SB) PW1000G–A–72– 

00–0154–00A–930A–D, Issue No. 001, 

dated May 7, 2021 (PW1000G–A–72– 

00–0154–00A–930A–D), and Pratt & 

Whitney SB PW1000G–A–72–00–0101– 

00B–930A–D, Issue No. 001, dated May 

7, 2021 (SB PW1000G–A–72–00–0101– 

00B–930A–D). These SBs describe 

procedures for removing and replacing 

the HPC front hub and HPC rotor shaft. 

Proposed AD Requirements in This 

NPRM 

This proposed AD would require 

removal and replacement of the HPC 

front hub and HPC rotor shaft. 

Differences Between This Proposed AD 

and the Service Information 

Pratt & Whitney SB PW1000G–A–72– 

00–0154–00A–930A–D and Pratt & 

Whitney SB PW1000G–A–72–00–0101– 

00B–930A–D provide instructions to 

concurrently perform the actions in 

Pratt & Whitney SB PW1000G–A–72– 

00–0157–00A–930A–D and SB 

PW1000G–A–72–00–0105–00B–930A– 

D, respectively. This AD does not 

require performance of the actions 

described in Pratt & Whitney SB 

PW1000G–A–72–00–0157–00A–930A– 

D or SB PW1000G–A–72–00–0105–00B– 

930A–D since these SBs describe ring 

seal replacement, which is not related to 

the unsafe condition addressed by this 

AD. 

Costs of Compliance 

The FAA estimates that this AD, if 

adopted as proposed, would affect 94 

engines installed on airplanes of U.S. 

registry. 

The FAA estimates the following 

costs to comply with this proposed AD: 

ESTIMATED COSTS

Action Labor cost Parts cost Cost per 

product 

Cost on U.S. 

operators 

Replace HPC front hub and HPC rotor 

shaft.

25.75 work-hours × $85 per hour = 

$2,188.75.

$120,090 $122,278.75 $11,494,202.50 

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. 


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Federal Register / Vol. 86, No. 105 / Thursday, June 3, 2021 / Proposed Rules 29709 

Regulatory Findings 

The FAA determined that this 

proposed AD would not have federalism 

implications under Executive Order 

13132. This proposed AD would 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 this proposed regulation: 

(1) Is not a ‘‘significant regulatory 

action’’ under Executive Order 12866, 

(2) Would not affect intrastate 

aviation in Alaska, and 

(3) Would not have a significant 

economic impact, positive or negative, 

on a substantial number of small entities 

under the criteria of the Regulatory 

Flexibility Act. 

List of Subjects in 14 CFR Part 39 

Air transportation, Aircraft, Aviation 

safety, Incorporation by reference, 

Safety. 

The Proposed Amendment 

Accordingly, under the authority 

delegated to me by the Administrator, 

the FAA proposes to amend 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: 

Pratt & Whitney: Docket No. FAA–2021– 

0447; Project Identifier AD–2021–00131– 

E. 

(a) Comments Due Date 

The FAA must receive comments on this 

airworthiness directive (AD) by July 19, 2021. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to Pratt & Whitney 

PW1519G, PW1521G, PW1521G–3, 

PW1521GA, PW1524G, PW1524G–3, 

PW1525G, PW1525G–3, PW1919G, 

PW1921G, PW1922G, PW1923G, and 

PW1923G–A model turbofan engines. 

(d) Subject 

Joint Aircraft System Component (JASC) 

Code 7230, Turbine Engine Compressor 

Section. 

(e) Unsafe Condition 

This AD was prompted by reports of cracks 

in the high-pressure compressor (HPC) rotor 

shaft that resulted in in-flight shutdowns and 

unscheduled engine removals. The FAA is 

issuing this AD to prevent cracking of the 

HPC rotor shaft. The unsafe condition, if not 

addressed, could result in release of a highpressure turbine disk, 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 Action 

At next engine shop visit after the effective 

date of this AD, remove HPC front hub, part 

number (P/N) 30G1910 or 30G3210, and HPC 

rotor shaft, P/N 30G1854, 30G3109, 30G4995, 

30G4953, or 31G0014, from service and 

replace each part with a part eligible for 

installation. 

(h) Definitions 

(1) For the purpose of this AD, an ‘‘engine 

shop visit’’ is the induction of an engine into 

the shop for maintenance involving the 

separation of pairs of major mating engine 

case flanges, except for the following, which 

do not constitute an engine shop visit: 

(i) Separation of engine flanges solely for 

the purposes of transportation without 

subsequent maintenance does not constitute 

an engine shop visit. 

(ii) Separation of engine flanges solely for 

the purpose of replacing the fan without 

subsequent maintenance does not constitute 

an engine shop visit. 

(2) For the purpose of this AD, a ‘‘part 

eligible for installation’’ is: 

(i) For a HPC front hub: Any HPC front hub 

with a P/N other than P/N 30G1910 or 

30G3210; and 

(ii) For a HPC rotor shaft: Any HPC rotor 

shaft with a P/N other than P/N 30G1854, 

30G3109, 30G4995, 30G4953, or 31G0014. 

(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 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. 

Issued on May 27, 2021. 

Gaetano A. Sciortino, 

Deputy Director for Strategic Initiatives, 

Compliance & Airworthiness Division, 

Aircraft Certification Service. 

[FR Doc. 2021–11565 Filed 6–2–21; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF THE INTERIOR 

Office of Surface Mining Reclamation 

and Enforcement 

30 CFR Part 917 

[SATS No. KY–263–FOR; Docket ID: OSM– 

2020–0002; S1D1S SS08011000 SX064A000 

212S180110; S2D2S SS08011000 

SX064A000 21XS501520] 

Kentucky Regulatory Program 

AGENCY: Office of Surface Mining 

Reclamation and Enforcement, Interior. 

ACTION: Proposed rule; public comment 

period and opportunity for public 

hearing on proposed amendment. 

SUMMARY: We, the Office of Surface 

Mining Reclamation and Enforcement 

(OSMRE), are announcing receipt of a 

proposed amendment to the Kentucky 

regulatory program (hereinafter, the 

Kentucky program), under the Surface 

Mining Control and Reclamation Act of 

1977 (SMCRA or the Act). Kentucky 

proposes to revise their administrative 

regulations to correct citations and 

revise language related to the repeal of 

the interim program regulations. 

This document gives the times and 

locations that the Kentucky program 

and this proposed amendment to that 

program are available for your 

inspection, the comment period during 

which you may submit written 

comments on the amendment, and the 

procedures that we will follow for the 

public hearing, if one is requested. 

DATES: We will accept written 

comments on this amendment until 4:00 

p.m., Eastern Daylight Time (e.d.t.), July 

6, 2021. If requested, we may hold a 

public hearing or meeting on the 

amendment on June 28, 2021. We will 

accept requests to speak at a hearing 

until 4:00 p.m., e.d.t. on June 18, 2021. 

ADDRESSES: You may submit comments, 

identified by SATS No. KY–263–FOR, 

by any of the following methods: 

• Mail/Hand Delivery: Mr. Michael 

Castle, Field Office Director, Lexington 

Field Office, Office of Surface Mining 

Reclamation and Enforcement, 2675 

Regency Road, Lexington, KY 40503. 

• Fax: (859) 260–8410. 

• Federal eRulemaking Portal: The 

amendment has been assigned Docket 

ID OSM–2020–0002 If you would like to 


khammond on DSKJM1Z7X2PROD with PROPOSALS