Version 3.0 (1 /30/2013) [4910-13-P] 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA-2012-1005; Directorate Identifier 2012-NE-27-AD; Amendment 

39-:XXXXX; AD 200X-XX-XX] 

1'7?l}f J.Pl} - D3 - ILl 

RIN 2120-AA64 

Airworthiness Directives; Pratt & Whitney Canada Corp Turboshaft Engines 

AGENCY: Federal Aviation Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: We are adopting a new airworthiness directive (AD) for certain Pratt & 

Whitney Canada Corp. (P&WC) PT6C-67C turboshaft engines. This AD requires initial 

and repetitive borescope inspections to verify the presence of a retaining ring securing the 

power turbine (PT) baffle located near the second stage PT disk. If the engine fails the 

inspection, this AD also requires removing the engine from service before further flight. 

This AD was prompted by five reported incidents of second stage PT disk damage. We 

are issuing this AD to prevent damage to the PT disk which, if undetected, could cause 

uncontained PT disk failure and loss of control of the helicopter. 

DATES: This AD becomes effective [Insert date 35 days after date of publication in the 

FEDERAL REGISTER]. 

ADDRESSES: The Docket Operations office is located at Docket Management Facility, 

U.S. Department of Transportation, 1200 New Jersey Avenue SE., West Building Ground 

Floor, Room W12-140, Washington, DC 20590-0001. 

OUTING SYMBOL 

AEG 

INITIALS/ SURNAME 

JKeymont/DA 
Re: ACTION BY 2/6/2013: 12-NE-27-AD, Pratt & Whitney Canada Corp 

Turboshaft Engines, Final Rule -- GRID 3.0 

James Lawrence 1 D 1 A 01/31/2013 0117 PM 

ANE 142 E . c .f. . 142 o: rexe ce : - , ng1ne ert1 1cat1on Branch 

Drexel: 

I concur. 

Jim Lawrence 

Tel: 781-238-7176 

Fax: 781 -238-7199 

em a i I: ja mes.lawrence@faa. gov 

Drexel Ace 

From: 

To: 

Date: 

Hi Jim, Normally, Grid 3.0, with legal concurrenc .. . 

Drexel Ace/ANE/FAA 

ANE-11 0, Standards Staff 

James Lawrence/ANE/FAA@FAA, 

01/31/2013 01 :14PM 

01/31/2013 01:14:35 PM 

Subject: ACTION BY 2/6/2013: 12-NE-27-AD, Pratt & Whitney Canada Corp Turboshaft Engines, Final Rule 

--GRID 3.0 

Hi Jim, 

Normally, Grid 3.0, with legal concurrence in hand, I would hand the AD and folder back to the ASE for 

concurrence. 

Grid 3.0 is attached. 

There have been no changes since Version 2.2 that you , AEG, and Tara concurred to. 

I'm told I can enter your concurrence on the "wet sign" version (as I've done for Vince, for example), and 

give it to James. 

So, you can either review the attached 3.0, or ask me to note your concurrence just based on your prior 

review of 2.2, 

in which case I will include your 2.2 concurrence email in the folder for scanning for the docket. 

Your choice, 

--Drexel 

[attachment "12ne31f.doc" deleted by James Lawrence/ANE/FAA] 

Drexel Ace 

Technical Writer-Editor 

Federal Aviation Administration 

Air Certification Service 

Engine & Propeller Directorate Standards Staff, ANE-11 0 

Burlington, MA 

Phone: 781-238-7197 
Page 1 of 1 

Re: ACTION BY 2/6/2013: 12-NE-27-AD, Pratt & Whitney Canada Corp Turboshaft Engines, Final 

Rule -- Version 3. 0 

Vincent Bennett 

to: 

Drexel Ace 

01 /30/2013 04:02PM 

Cc: 

James E Gray, James Lawrence, John Golinski, Paul Donato 

Hide Details 

From: Vincent Bennett/ANE/FAA 

To: Drexel Ace/ ANE/F AA@F AA, 

Cc: James E Gray/ANE/FAA@FAA, James Lawrence/ANE/FAA@FAA, John 

Golinski/ ANE/F AA@F AA, Paul Donato/ ANE/F AA@F AA 

./ Legal concurs. 

R, 

v 

----- Drexel Ace/AN E/FAA wrote : -----

To: Vincent Bennett/ANE/FAA@FAA 

From: Drexel Ace/ AN E/FAA 

Date: 01/30/2013 03:21PM 

Cc: John Golinski/ANE/FAA@FAA, Paul Donato/ANE/FAA@FAA, James E Gray/ANE/FAA@FAA, 

James Lawrence/ ANE/FAA@FAA 

Subject: ACTION BY 2/6/2013: 12-NE-27-AD, Pratt & Whitney Canada Corp Turboshaft Engines, 

Final Rule -- Version 3.0 

Hi Vince, 

Version 3.0 attached for your review I approval. 

This is a final rule after notice, based on MCAI. 

Thanks. 

--Drexel 

(See attached file: 12ne27f.doc) 

Drexel Ace 

Technical Writer-Editor 

Federal Aviation Administration 

Air Certification Service 

Engine & Propeller Directorate Standards Staff, ANE-110 

Burlington, MA 

Phone: 781-238-7197 

[attachment "12ne27f.doc" removed by Vincent Bennett/ANE/FAA] 

file:/ /C:\Users\ANE 11 ODA \AppData\Local\Temp\ 1 notes9D4F73\~web5486.htm 1131/2013 
Re: ACTION BY 1130/2013: 12-NE-27-AD, Pratt & Whitney Canada Corp 

Turboshaft Engines, Final Rule -- Version 2.2 

John Keymont 

AEA-BOS-AEG-67, Burlington, MA to: Drexel Ace 

Cc. James E Gray, James Lawrence, John Golinski, Paul Donato, Tara 

Fitzgerald 

Drexel; 

BOS AEG concurs with version 2.2. 

John 

John Keymont 

Aviation Safety Inspector 

Aircraft Evaluation Group 

12 New England Executive Park 

Burlington, MA 01803 

Phone: 781-238-7892 

Fax: 781-238-7898 

01/30/2013 01 :31 PM 

We value your comments, please fill out the form below: 

http://www.faa.gov/about/office_org/headquarters_offices/avs/stakeholder_feedbacklafs/field/sf_aeg/ 

Drexel Ace 

From: 

To: 

Cc: 

Date: 

Subject: 

Version 2.2, with a couple of additional correctio ... 

Drexel Ace/ANE/FAA 

ANE-11 0, Standards Staff 

James Lawrence/ANE/FAA@FAA, Tara Fitzgerald/ANE/FAA@FAA, John 

Keymont/ AEA/F AA@F AA, 

01/29/2013 05:22:40 PM 

James E Gray/ANE/FAA@FAA, John Golinski/ANE/FAA@FAA, Paul Donato/ANE/FAA@FAA 

01/29/2013 05:22PM 

ACTION BY 1/30/2013: 12-NE-27-AD, Pratt & Whitney Canada Corp Turboshaft Engines, Final 

Rule -- Version 2.2 

Version 2.2, with a couple of additional corrections to SB citations noted in turquoise, attached for your 

review I concurrence. 

I should have picked up on the cascade of updated citations into Optional Terminating Action and IBR 

sections. 

I'm putting a 1-day ACTION date on this to keep it moving. 

Thanks. 

--Drexel 

[attachment "12ne27f.doc" deleted by John Keymont/AEA/FAA] 

----- Forwarded by Drexel Ace/ANE/FAA on 01 /29/2013 04:43PM-----
... 

Drexel, 

Re: ACTION BY 1/30/2013: 12-NE-27-AD, Pratt & Whitney Canada Corp 

Turboshaft Engines, Final Rule -- Version 2.2 lidl 

Tara Fitzgerald 

ANE 11 1 R I k

. dP 1. to: Drexel Ace 01/29/201305:28PM - , u ema mg an o 1cy 

Cc: James E Gray, James Lawrence, John Golinski, John Keymont, Paul 

Donato 

I concur with version 2.2. 

Tara Fitzgerald 

Federal Aviation Administration 

Engine & Propeller Directorate Rulemaking and Policy, ANE-111 

12 New England Executive Park 

Burlington, MA 01803 

781-238-7130 

Drexel Ace 

From: 

To: 

Cc: 

Date: 

Subject: 

. Version 2.2, with a couple of additional correctio ... 

Drexel Ace/ANE/FM 

ANE-11 0, Standards Staff 

James Lawrence/ANE/FM@FM, Tara Fitzgerald/ANE/FM@FM, John 

KeymonU AEA/F AA@FAA, 

01/29/2013 05:22:39 PM 

James E Gray/ANE/FM@FM, John Golinski/ANE/FM@FM, Paul Donato/ANE/FM@FM 

01/29/2013 05:22PM 

ACTION BY 1/30/2013: 12-NE-27-AD, Pratt & Whitney Canada Corp Turboshaft Engines, Final 

Rule -- Version 2.2 

Version 2.2, with a couple of additional corrections to SB citations noted in turquoise, attached for your 

review I concurrence. 

I should have picked up on the cascade of updated citations into Optional Terminating Action and IBR 

sections. 

I'm putting a 1-day ACTION date on this to keep it moving. 

Thanks. 

--Drexel 

[attachment "12ne27f.doc" deleted by Tara Fitzgerald/ANE/FAA] 

----- Forwarded by Drexel Ace/ANE/FAA on 01/29/2013 04:43 PM -----

From: 

To: 

Cc: 

Date: 

Subject: 

Drexel Ace/ANE/FM 

ANE-11 0, Standards Staff 

James Lawrence/ANE/FM@FM, John KeymonUAEA/FM@FM, Tara 

Fitzgerald/ANE/FM@FM, 

James E Gray/ANE/FM@FM, John Golinski/ANE/FM@FM, Paul Donato/ANE/FM@FM 

01/24/2013 03:25PM 

ACTION BY 1/28/2013: 12-NE-27-AD, Pratt & Whitney Canada Corp Turboshaft Engines, Final 

Rule-- Version 2.1