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 

INITIALS/ SURNAME 

AMollica/DA 

ATE 

11 /21 /2012 

NPRM required installation of a new simplified one-piece supporting bracket to eliminate "'====--

OUTING SYMBOL 

mis-assembly. This supplemental action adds an engine model, alters the list of affected 

AEG 

INITIALS/ SURNAME 

GHu1verson/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-007, Office of Reg ional Counsel 

Hi Vince, Version 3.3 attached for your review/. .. 

Drexel 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 

Subject: 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 ica 

ANE-11 1, Rulemaking and Policy 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: 

To: 

Cc: 

Date: 

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 

99-NE-24-sn1 .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 
Re: ACTION BY 11/28/2012: 1999-NE-24-AD, General Electric Company 

Turbofan Engines, SNPRM --Version 2.0 til 

Gary Hulverson 

AEA-BOS-AEG-67, Burlington, 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 Version 2.0 of AD 99-NE-24 NPRM with one comment. Bracket instead of braket. 

See attached. 

9SJN E-24~n l.doc 

Regards, 

Gary H. 

qary ~ Jfu{verson 

Aircraft Evaluation Group BOS-AEG 

Tel (781) 238-7896 

Fax (781) 238-7898 

E-mail: gaty .hulverson@faa .gov 

We value your comments, please fill out the form using the following linlc 

http://www.faa.gov/about/office org!headquarters offices/avs/stakeholder feedback/afs/field/sf aeg/ 

From: 

To: 

Cc: 

Date: 

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