Re: Comment to FAA Docket No. FAA-2013-0342 Directorate Identifier 2013-NE-14-AD - EASA AD 2013-0143 “Fan Blade Leading Edge Reprofiling” Anthony Cerra

A NE-142, Engine Certification Branch 142 to: Aissen, Etzard 01/28/2014 01:10 PM

Cc: "Firsching, A xel", Eugene Triozzi, Rose Len, John Golinski

Bcc: A nthon y .Cerra

Etzard,

Thank you for sending the below comments on 1/27/2014. As you are aware, the public comment period closed on 11/25/2013. We have reviewed your comment which is to give credit for repairs done using

RRD Non Modification Service Bulletin (NMSB) No. TAY

‐ 72

‐ 1603, Initial Issue, dated June 21, 2004; or Engine Manual Repair HRS3629. As you noted below and as is identified very clearly in the RRD Alert

NMSB No. TAY

‐ 72

‐ A1782 compliance section, all three of these publications are equivalent as they all
point to the Engine Manual Repair HRS 3629 instructions. RRD Alert NMSB No. TAY

‐ 72

‐ A1782 notes that
repairs done to RRD Non Modification Service Bulletin (NMSB) No. TAY

‐ 72

‐ 1603, Initial Issue, dated June
21, 2004, or Engine Manual Repair HRS3629 is compliance to RRD Alert NMSB No. TAY

‐ 72

‐ A1782 , which

is the service bulletin identified in our AD.

We have decided not to change our AD to incorporate your comments for the following reasons: Our final rule AD is within a day or two of being issued. If we were to incorporate your requested 1. change, we would have to restart our review process which would add significant delay to issuing this safety action. (reference 14 CFR 11.45(b)) Making the change would not have any safety impact and would not change the compliance actions. 2. Since these alternative documents are already referenced in the service bulletin we cite, it may be 3. unnecessary to explicitly identify them in the AD. During the public comment period no operators requested this change. In light of the small number of 4. US engines, 25 by your count and 52 by our count, there is a likelihood that no operators may be affected by this. If any are, a global AMOC may be requested.

Thank you again for your comments,

Best Regards,

Anthony W. Cerra Jr. Engine Certification Office, ANE-142 International CMT Program Manager phone 781.238.7128 fax 781.238.7199 Anthony

. Cerra @ faa

. gov

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"Aissen, Etzard" 01/27/2014 10:18:19 AM Len, Tony, as discussed on the phone and prese...

From: " A issen, Etzard" <Etzard. A issen@Rolls-Royce.com>

A NE-142, Engine Certification Branch 142

To: A nthony Cerra/ A NE/FAA@FAA, Rose Len/ A NE/FAA@FAA,
Cc: Eugene Triozzi/ A NE/FAA@FAA, "Firsching, A xel" < A xel.Firsching@Rolls-Royce.com>

Date: 01/27/2014 10:18 A M Subject: FAA Docket No. FAA-2013-0342 Directorate Identifier 2013-NE-14- A D - EASA AD 2013-0143 “Fan Blade Leading Edge Reprofiling”Len, Tony,

as discussed on the phone and presented by Axel during his visit (attached power point page 2) please

find attached Rolls

‐ Royce Deutschland (RRD) comment on FAA Docket No. FAA

‐ 2013

‐ 0342; Directorate

Identifier 2013

‐ NE

‐ 14

‐ AD:

The RRD NMSB states that repair can be performed via:

‐ RRD NMSB No. TAY

‐ 72

‐ A1782

, Revision 2, dated May 30, 2013 or earlier revisions; or

‐ RRD NMSB No. TAY

‐ 72

‐ 1603, Initial Issue, dated June 21, 2013; or

‐ Engine Manual Repair HRS3629 (Engine Manual, Chapter 72

‐ 31

‐ 12, TASK

72

‐ 31

‐ 12

‐ 300

‐ 005)

RRD would propose to allow either of the 3 above repair instructions as a method of compliance to the

Airworthiness Directive since they are equivalent.

I have attached an earlier e

‐ mail on the topic suggesting some wording for the AD

.

Best Regards

Etzard

Etzard Aissen (E

‐ A )

A irworthiness Office

Rolls

‐ Royce Deutschland Ltd & Co KG

, Eschenweg 11

, Dahlewitz

15827 Blankenfelde

‐ Mahlow ‐ Germany

Tel.: +49 (0 ) 33708 6 ‐ 1536

E

‐ Mail: etzard

. aissen @ rolls

‐ royce

. com



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(c) 2013 Rolls-Royce plc

Registered office: 65 Buckingham Gate, London SW1E 6AT Company number: 1003142. Registered in England.

-

2013-07 proposal for FAA AD Final.doc A Ds Presented.ppt

### 03/02/2014

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# Anticipated AD Actions Tay

FAA - RRD Liaison Meeting

Burlington, MA

17th of January 2014



## Airworthiness Directive - Status

There are EASA ADs, issued in 2013, where there is no equivalent FAA AD:

EASA AD 2013-0143 “Fan Blade Leading Edge Reprofiling”:

• EASA AD 2013-0143 mandates NMSB TAY-72-A1782 Rev. 2

• US: 22 Tay 650-15 (Fokker 100); 3 Tay 651-54 (Boeing 727)

• FAA has issued Docket No. FAA-2 013-0342; Directorate Identifier

2013-NE-14-AD

• RRD will comment FAA Docket w.r.t. al ternative instructions for LPC fan

blade repair. The RR NMSB states that repair can be performed via:

(i) RRD NMSB No. TAY-72-A1782, Revision 2, dated May 30, 2013 or earlier revisions; or

(ii) RRD NMSB No. TAY-72-1603, Initial Issue, dated June 21, 2013; or

(iii) Engine Manual Repair HRS 3629 (Engine Manual, Chapter 72-31-12, TASK 72-31-12-300-005)

• FAA are recommended to consider RRD comments for final publication of this

AD 2Unless already done, do the following actions.

1) For the Tay 620-15 engines replace the complete set of Low Pressure Combustor (LPC) fan blades with a set eligible for installation as follows:

(i) If on the effective date of this AD the LPC fan blades

(a) Have less than 10,000 flight cycles since new (FCSN) or flight cycles since last repair (FCSLR), replace the blades before 12,000 flight FCSN or FCSLR. (b) Have 10,000 or more FCSN or FCSLR, replace the blades within 2,000 FC.

(ii) Thereafter, replace the LPC fan blades every 12,000 FC.

(2) For Tay 650-15 and Tay 651-54 engines, replace the complete set of LPC fan blades with a set eligible for installation as follows:

(i) If on the effective date of this AD the LPC fan blades

(a) Have less than 8,000 FCSN or FCSLR, replace the blades before 10,000 FCSN or
FCSLR. (b) Have 8,000 or more FCSN or FCSLR, replace the fan blades within 2,000 FC.

(ii) Thereafter, replace the LPC fan blades every 10,000 FC.

x) Definition (1) LPC fan blades eligible for installation are: (i) New LPC fan blades; or (ii) For Tay 620-15 engines, LPC fan blades with less than 12,000 FCSN or FCSLR (iii) For Tay 650-15 and Tay 651-54 engines, LPC fan blades with less than 10,000 FCSN or FCSLR

Repair of the LPC fan blade means having used the instructions in (i) RRD NMSB No. TAY-72-A1782, Revision 2, dated May 30, 2013 or earlier revisions ; or (ii) RRD NMSB No. TAY-72-1603, Initial Issue, dated June 21, 2013; or (iii) Engine Manual Repair HRS3629 (Engine Manual, Chapter 72-31-12, TASK 72-31-12-300-005)