Docket No: FAA-2015-7095 

Directorate ID: 2015-SW-085-AD 

Originating Office Tracking No.: 

Disposition Comments 

Next Step: OFRAN c;(sNPRM 

0 These comments are in 

response to an SNPRM 

D No Comments/Only Supportive Comments Received- If this box is checked, no signatures are 

required. 

Yes/No Has the referenced service information been revised since the NPRM was issued? 

If yes, list latest revision and attach a copy. Note that changes beyond the scope of the 

previously published NP RM will require a new notice. Contact the Directorate focal point 

for guidance. Although no new service information has been released yet, a new Trev will 

be issued if the life must be reduced before this AD goes to Final Rule. 

Instructions: Summarize all comments by issue (not by commenter) and provide your recommended resolution of 

each issue. All comments relating to the same issue should be discussed together. Do not list all of the issues 

from one commenter together. If changes to the AD are required based on the comments received, explain why and 

describe in detail what change(s) you recommend. Reference FAA-IR-M-8040.1C Chapter 9. 

ISSUE 1: Select one of the following: delay issuance of AD 

I/ other, explain: 

Commenter(s): Sikorsky Aircraft Corporation 

What change to the AD action is requested? . Sikorsky respectfully requests that FAA extend the NPRM 

comment period until after December 15, 2016 

Why is the change requested or how is it justified? Sikorsky Aircraft is currently re-evaluating the 

structural substantiation of the part number 92358-06107-043 S-92A tail gearbox center housing which 

resulted in the 12,200 hour Airworthiness Limitations Chapter 4 replacement time. The re-evaluation was 

initiated due to the discovery of an error in the measured flight test loads that were used in the structural 

fatigue substantiation. A preliminary re-calculation of the 92358-06107M043 housing replacement time 

with corrected flight loads resulted in a 11 ,300 hour replacement time. This preliminary calculation will 

undergo more refinements but the final calculated value may remain below 12,200 hours. 

Do we agree? Yes 

If YES, we agree because Sikorsky has discovered an error in their life calculation. The Final Rule 

should be issued once the error is corrected. Make the following changes to the AD: Extend the 

NPRM comment period untill2/151l6. 

lfPARTIALLY AGREE, we agree with Insert text because Insert justilication We disagree with 

Insert text because Insert justificlllion Make the following changes to the AD: f.ist any 

dwngcs to tht· i\ D 

If NO, we don't agree because Insert our mtinnale 

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ISSUE 2: Select one of the following: CIHlOSc one. 

If other, explain: Click her~ to enter tc:-.:1. 

Commenter(s): Click here to cmcr text. 

What change to the AD action is requested? Click here to t:ntcr text. 

Why is the change requested or how is it justified? Click ht·re to enter Lc;.a. 

Do we agree? Ye:-;/No 

If YES, we agree because Insert iusti!ication Make the following changes to the AD: I.i.st any 

changcs W the AD 

If PARTIALLY AGREE, we agree with Insert text because Insert justification We disagree with 

Insert text because Insert just i!ication Make the following changes to the AD: List an) 

changes to !he AD 

If NO, we don't agree because Insert our mlionalc 

For additional issues, double-click berc 

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Signature Section 

Signature indicates concurrence with this action. 

Originating Office Tracking No.: 

ASE Printed Name: J.((';::.to~lter G-r&r Date 

Date 

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