### DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA-2012-0817; Directorate Identifier 99-NE-24-AD] RIN 2120-AA64 Airworthiness Directives; General Electric Company Turbofan Engines AGENCY: Federal Aviation Administration (FAA) , DOT. ACTION: Supplemental notice of proposed rulemaking (NPRM); reopening of comment period. SUMMARY: We are revising an earlier proposed airworthiness directive (AD) for certain General Electric Company (GE) CF6-80C2 series turbofan engines. That NPRM proposed to supersede an AD that required replacement of fuel tubes connected to the fuel flowmeter. That NPRM was prompted by several reports of fuel leaks , and two reports of engine fire , due to mis-assembled supporting brackets on the fuel tube connecting the flowmeter to the Integrated Drive Generator (IDG) fuel-oil cooler. That I N ITI AL S/ SURNAME AM o llic a/D A
ATE 11 /21 /2012 

### NPRM required installation of a new simplified one-piece supporting bracket to eliminate 

### "'====-- OUT I NG SYMBO L 

### mis-assembly. This supplemental action adds an engine model , alters the list of affected AEG
INIT I ALS/ SURNAME GHu1v e rso n/ DA 

### part numbers (PINs) , changes the replacement schedule , and revises our estimated cost of**~,-----** ATE 

### compliance. We are reopening the comment period to allow the public the opportunity to comment on these proposed changes. We are proposing this AD to prevent high-pressure fuel leaks caused by improper seating of fuel tube flanges , which could result in an engine fire and damage to the airplane. DATES: We must receive comments on this supplemental NPRM by [INSERT DATE 60 DAYS AFTER DATE OF PUBLICATION IN THE FEDERAL REGISTER]. ADDRESSES: You may send comments , using the procedures found in 14 CFR 11.43 and 11.45 , by any ofthe following methods: 11 / 21 /2012

# ..

Re: ACTION BY 12/13/2012: 1999-NE-24-AD, General Electric Company Turbofan Engines, SNPRM -- Grid Version 

### 3.3**~**
Legal concurs . Regards, 

# v Drexel Ace From: To: Date : Vincent Bennett to
. Drexel Ace ANE - 00 7, Office of Reg i ona l Coun se l

Hi Vince, Version 3
. 3 attached for your review/.

.. Dre x el Ace/ANE/FAA ANE-11 0, Standards Staff Vincent BennetUANE/FAA@FAA, 12/18/2012 04 : 12PM 12/18/2012 04 : 31 PM

12/ 18/2012 04:12 : 39 PM

S ubj ect: Re : ACTION BY 12/ 13/2012 : 1999-NE-24-AD , General Electric Company Turbofan Engines , SNPRM --Grid Version 3
. 3 Hi Vince , Version 3
. 3 attached for your review 

### I concurrence . Re : two comments in your message below : 1
. Cost of adding ILC was already correctly reflected in totals in Cost section ; Internal grid review called for adding a mention of ILC in the "Costs of Compliance" paragraph , which is done , so I think we're all set there

. 2
. SB integration : we have deleted, as you requested , refs to individual SBs in each of the compliance action paragraphs

. We instead gathered all SB ref info in Related Information , paragraph (2) , as Engineering strongly believes , based on the variability of expertise as reflected in the comments , that providing these references is helpful. Engineering does not want to IBR. Hopefully , a soft reference in Related Info is OK

. In addition , I have highlighted areas of your several other edits (all of which have been effected in the AD) in yellow (if you deleted an entire sentence , yellow indicates where it used to be)

. I've kept your edited version attached below for your reference

. Note that we are at 43 days on this SNPRM

. Thanks

.

- -Drexel

99-NE-24-sn1

. doc
Drexel Ace Technical Writer-Editor Federal Aviation Administration Air Certification Service Engine & Propeller Directorate Standards Staff , ANE-11 0

# , '



### Re: ACTION BY 11/28/2012: 1999-NE-24-AD, General Electric Company Turbofan Engines, SNPRM --Version 2.0 

### [i Ann Moll i ca A NE -11 1 , Rul emaking and Pol icy to: Drexel Ace Cc: Gary Hulverson , James E Gray , John Golinski, Kasra Sharifi, Paul Donato I concur. Ann C. Mollica FAA, Engine and Propeller Directorate Standards Staff, Rulemaking and Policy Branch 781
. 238.7192 

### We value your feedback

. Click here to send feedback. 11/21/2012 07:22AM

Drexel Ace

.... . ..... ................. . ..... ... .

## \fW§ie>**Q !t9** **¢~E?~fg ['** **yglj ~f;Yit?0/~()l)gl1/r~1** **;,,** •.•..•.. ···········••·•·...... ? ..• .

## f1Jc?.QI?Q**ig: P9** **:~ .;;** **pM** From: T o: Cc: Date: Subj ect: Drexel Ace/ANE/FAA ANE-11 0, Standards Staff Kasra Sharifi/ANE/FAA@FAA, Ann Mollica/ANE/FAA@FAA, Gary Hulverson/ANE/FAA@FAA, John Golinski/ANE/FAA@FAA , Paul Donato/ANE/FAA@FAA, James E Gray/ANE/FAA@FAA 11/20/2012 03 :45PM ACTION BY 11/28/2012 : 1999-NE-24-AD , General Electric Company Turbofan Engines , SNPRM
-- Version 2
. 0 Version 2.0 attached for your review 

### I concurrence . Thanks

. --Drexel

99-NE-24-sn1

. doc
Drexel Ace Technical Writer- Editor Federal Aviation Administration Air Certifi cation Service Engine & Propeller Directorate Standards Staff , ANE-11 0 Burlington, MA Phone : 781-238-7197

### Re: ACTION BY 11/28/2012: 1999-NE-24-AD, General Electric Company Turbofan Engines, SNPRM --Version 2.0 

## til Ga ry Hu lv erso n A EA- BOS-A E G- 67, Burli n gton , MA to: Drexel Ace 11/21/2012 10:57 AM Cc : Ann Mollica, James E Gray, John Golinski, Kasra Sharifi , Paul Donato 

### I concur with Vers i on 2.0 of AD 99-NE-24 NPRM with one comment. 

### Bracket instead of 

### braket. See attached

.**9SJN E-24~** **n** l. d oc Regards, Gary H. 

## qary**~** 

### Jfu{verson A ircraft Evaluation Group BOS- AE G Tel (781) 2 38-7896 Fax (781) 238-7898 E-mail: gat y .h ul verson @ faa
. go v

We value your comments , please fill out the form using the followin g linlc http :/ /www .faa
. gov/about/office org!headquarters of fi ce s/avs/stakeholder f eedb ack/afs/fiel d/sf aeg/

Fro m: T o: C c: D ate: Subject: Drexel Ace/ANE/FAA ANE-11 0, Standards Staff Kasra Sharifi/ANE/FAA@FAA , Ann Mollica/ANE/FAA@FAA, Gary Hulverson/ANE/FAA@FAA John Golinski!ANE/FAA@FAA , Paul Donato/ANE/FAA@FAA, James E Gray/ANE/FAA@FAA 11/20/2012 03 :45PM ACTION BY 11/28/2012: 1999-NE-24-AD, General Electric Company Turbofan Engines , SNPRM
-- Version 2.0 Version 2
. 0 attached for your review 

### I concurrence. Thanks. --Drexel [attachment "99-NE-24-sn1.doc" deleted by Gary Hulverson/ANE/FAA]
Drexel Ace Technical Writer-Editor Federal Aviation Administration Air Certification Service Engine & Propeller Directorate Standards Staff, ANE-11 0 Burlington, MA