### 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 O NCU RR ENCES ROUT I NG SY MBO L ANE-110

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DATE 2/2 5113 

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



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### from 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. AS tr0111/0A
DAT E 2114113
RO UT I N G SYM BOL AEG
I N ITI ALS/ SU R NAME POL ear

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or .J Whi DA DAT E 2/ 14/ 13Legal concurs . Regards, 

# v Drexel Ace From: To: Cc : Date: Subj ect:
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 -00 7 , Office of Regiona l Counse l o: rexe ce : Cc: lan Dargin, James E Gray, John Golinski, Paul Donato

. _

Hi Vi nc e , Ple ase see Version 3.1 , attac hedfor 

### 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 revis i on 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 Drex el Ace/ANE/FAA on 02/25/2013 02:01 P M- -- -- From : To : Cc : Date: S u bj ect: 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 Div i sion 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-6 7, Bu rli ngton. MA Cc: Joseph R White Covering for Joe White , 

### I concur. Joseph R White Morn i ng 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/ 14/2 013 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 rev i sed 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 Wh ite/ANE/FAA on 02 / 1 4/2013 05:59AM-----

From: To: Cc: Date: Subject: Drexel Ace/ANE/FAA ANE-11 0 , Standards Staff ian Da rg i n/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 Eng i nes , NPRM -- Version 2.2 Please see Version 2
.2 attached for your rev i ew 

### 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 Eng i ne & 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 Fr

om : . Plea s e see Version 2
. 2 attached for your re view

. . . Drexel Ace/ANE/FAA ANE-11 0, Standards Staff 02/ 13/2013 02 : 39 : 12 PM

To: Cc : Dat e: 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 S ubj ect: 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