Version 3.1 (2/25/20 13)[4910-13-P] 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA-2013-0072; Directorate Identifier 2013-NE-04-AD] 

RIN 2120-AA64 

Airworthiness Directives; Pratt & Whitney Division Turbofan Engines 

AGENCY: Federal Aviation Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking (NPRM). \}_ ~ SUMMARY: We propose to adopt a new airworthiness directive (AD) for all PrJl& 

Whitney Division (PW) turbofan engine models PW4074, PW4074D, PW4077, 

PW4077D, PW4084D, PW4090, and PW4090-3 with a certain 2nd-stage high-pressure 

turbine (HPT) air seal part number (PIN) installed. This proposed AD was prompted by 

ONCU RRENCES 

ROUTING SYMBOL 

ANE-110 

INITIALS/ SURNMviE 

VBennetiJDA 

DATE 

2/25113 

discovery of cracks in the 2nd -stage HPT air seals. This proposed AD would require, for RO MBOL:---

1 . 1 h . I . (CSN) . . . . d 1 ANE-111 t 1ose mr sea s t at meet certam eye es smce new cntena, mspect10n an remova lc-IN=11T""'I AL""' SI=Su=RN'""AIV-,: 1Efrom service ofHPT air seals that fail inspection. We are proposing this AD to prevent 

failure of the 2nd -stage HPT air seal, which could lead to an uncontained engine failure 

and damage to the airplane. 

DATES: We must receive comments on this proposed AD by [INSERT DATE 60 

DAYS AFTER DATE OF PUBLICATION IN THE Federal Register]. 

ADDRESSES: You may send comments, using the procedures found in 14 CPR 11.43 

and 11.45, by any of the following methods: 

• Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the 

instructions for submitting comments. 

• Fax: 202-493-2251. 

AStr0111/0A 

DATE 

2114113 

ROUTING SYMBOL 

AEG 

INITIALS/ SURNAME 

PO Leary for .J Whi 

DA 

DATE 

2/ 14/ 13 
Legal concurs. 

Regards, 

v 

Drexel Ace 

From: 

To: 

Cc: 

Date: 

Subject: 

Hi Vince, 

Re: Fw: ACTION BY 2/28/2013: 13-NE-04, Pratt & Whitney Division Turbofan 

Engines, NPRM -- Version 3.1 [d1 

Vincent Bennett t D I A 02/25/2013 04 12 PM 

ANE-007, Office of Regional Counsel o: rexe ce : 

Cc: lan Dargin, James E Gray, John Golinski, Paul Donato 

. _Hi Vince, Please see Version 3.1 , attachedfor y ... 

Drexel Ace/ANE/FAA 

ANE-11 0, Standards Staff 

Vincent BennetUANE/FAA@FAA, 

02/25/2013 02:16:51 PM 

lan Dargin/ANE/FAA@FAA, John Golinski/ANE/FAA@FAA, Paul Donato/ANE/FAA@FAA, James 

E Gray/ANE/FAA@FAA 

02/25/2013 02:16PM 

Fw: ACTION BY 2/28/2013: 13-NE-04, Pratt & Whitney Division Turbofan Engines, NPRM --

Version 3.1 

Please see Version 3.1, attached for your review I concurrence. 

Changes since Version 3.0 are shown with revision marks. 

Thanks. 

--Drexel 

13ne04n.doc 

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 

To send us your feedback, click here! 

-----Forwarded by Drexel Ace/ANE/FAA on 02/25/2013 02:01 PM-----

From: 

To: 

Cc: 

Date: 

Subject: 

lan Dargin/ANE/FAA 

ANE-142, Engine Certification Branch 142 

James E Gray/ANE/FAA@FAA, 

Drexel Ace/ANE/FAA@FAA, John Golinski/ANE/FAA@FAA, Paul Donato/ANE/FAA@FAA 

02/25/201310:17 AM 

Re: ACTION BY 2/28/2013: 13-NE-04, Pratt & Whitney Division Turbofan Engines, NPRM --

Version 3.0 
Re: ACTION BY 2/15/2013: 13-NE-04, Pratt & Whitney Division Turbofan 

Engines, NPRM -- Version 2.2 ~ 

Peter O'Leary to: Drexel Ace, lan Dargin 02/14/2013 09:07 AM 

AEA-BOS-AEG-67, Burlington. MA 

Cc: Joseph R White 

Covering for Joe White, I concur. 

Joseph R White Morn ing Pete, Looks like this has already been r ... 

From: 

To: 

Date: 

Joseph R White/ANE/FAA 

AEA-BOS-AEG-67, Burlington, MA 

Peter O'Leary/ANE/FAA@FAA, 

02/14/2013 06:01AM 

02/14/2013 06:01:20 AM 

Subject: Re: ACTION BY 2/15/2013: 13-NE-04, Pratt & Whitney Division Turbofan Engines, NPRM --

Version 2.2 

Morning Pete, 

Looks like this has already been revised from 2.0 to 2.1 to 2.2 before I've even had a chance to look at it. 

Joe 

----- Forwarded by Joseph R White/ANE/FAA on 02/14/2013 05:59AM-----

From: 

To: 

Cc: 

Date: 

Subject: 

Drexel Ace/ANE/FAA 

ANE-11 0, Standards Staff 

ian Dargin/ANE/FAA@FAA, Alan Strom/ANE/FAA@FAA, Joseph R White/ANE/FAA@FAA 

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

02/13/2013 02:39 PM 

Re: ACTION BY 2/15/2013: 13-NE-04, Pratt & Whitney Division Turbofan Engines, NPRM --

Version 2.2 

Please see Version 2.2 attached for your review I concurrence. 

This version answers to James' point about excepting operators from complying with the reporting 

requirements of the PW SB. 

That change is highlighted in yellow, as is the change that was incorporated in Version 2.1. 

Thanks. 

--Drexel 

13ne04n.doc 

Drexel Ace 

Technical Writer-Editor 

Federal Aviation Administration 

Air Certification Service 

Engine & Propeller Directorate Standards Staff, ANE-11 0 

Burlington, MA 
.. 

Re: ACTION BY 2/15/2013: 13-NE-04, Pratt & Whitney Division Turbofan 

Engines, NPRM -- Version 2.2 lciJ; 

Alan Strom to: Drexel Ace 02/14/2013 07:08AM 

Drexel, 

Cc: lan Dargin, James E Gray, John Golinski, Joseph R White, Paul 

Donato 

I concur with version 2.2. 

Regards, 

Alan 

Alan B. Strom 

Aerospace Engineer 

Aircraft Certification Service 

Engine & Propeller Directorate Standards Staff 

ANE-110 

12 New England Executive Park 

Burlington, MA 01803 

T (781) 238-7143 

F (781) 238-7199 

Drexel Ace 

From: 

. Please see Version 2.2 attached for your review ... 

Drexel Ace/ANE/FAA 

ANE-11 0, Standards Staff 

02/13/2013 02:39:12 PM 

To: 

Cc: 

Date: 

lan Dargin/ANE/FAA@FAA, Alan Strom/ANE/FAA@FAA, Joseph R White/ANE/FAA@FAA 

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

02/13/2013 02:39 PM 

Subject: Re: ACTION BY 2/15/2013: 13-NE-04, Pratt & Whitney Division Turbofan Engines, NPRM --

Version 2.2 

Please see Version 2.2 attached for your review I concurrence. 

This version answers to James' point about excepting operators from complying with the reporting 

requirements of the PW SB. 

That change is highlighted in yellow, as is the change that was incorporated in Version 2.1. 

Thanks. 

--Drexel 

[attachment "13ne04n.doc" deleted by Alan Strom/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