## FAA **MCAI AD WORKSHEET** Rolls Royce Deutshland Tay 6 20 - 15 LP blades Docket # Office File # SP 03 3 60 EN - E **Proposed Action** Notice of Proposed Rulemaking X Immediately Adopted Rule (IAR) Final Rule after NPRM [ Attach response to comments on separate sheet ] Other _________________________ 

### Part 39 Requirements. **An unsafe condition exists in the refer enced product(s), and the**  **existing unsafe condition is likely to exist or develop in products of this same type design. The signatures on this Worksheet document the signers’ determination that 14**  **CFR Part 39 criteria are met as described above and an AD**  **is required to address the unsafe condition. 1. Reference Information.**  1a. List the MCAI (FCAA AD No./Revision/Date): EASA AD 2012 - 0185 - E , September 12 , 2012 1b. List the related service information number(s), Revision, and Date : ASB Tay - 72 -A 1775 Re vision 1. Dated , July 26 , 2012 1c. List any other published FAA ADs related to this unsafe condition: 2. **Products Affected** . Identify affected manufacturer and model ( only if different from the MCAI applicability for US certificated products) as listed on TCDS; or serial numbers or references, installations, part numbers, as applicable Note : 3. **Project Engineer.** Name/Title/Branch: Frederick Zink, ANE 142 Telephone: 781 - 238 - 7779 Fax: 781 - 238 - 7199 4 . **Corrective Action Assessment.** Are the actions and compliance times required in the MCAI adequate to resolve the unsafe condition? X Yes No If not, U nilateral AD action may be necessary . If all criteria for Unilateral AD Action are met (See Order 8040.5 ), insert rationale for differing correctiv e actions and/or compliance times, and specify the FAA- required actions/times :

## FAA MCAI **AD WORKSHEET**  **(CONTINUED)**

5. **Adequate Notice Assessment.** Does the MCAI text describe the unsafe condition and corrective action with sufficient detail and clarity that it can be used in the FAA AD to p rovide adequate notice? X Yes No If no, provide text to augment the MCAI description of unsafe condition and required actions (Copy text from service information where possible). Text to augment the MCAI as follows:
6. **FAA Requirements and Policies** 6a . **Clear and Enforceable Requirements.** Are changes from the MCAI requirements necessary to ensure enforceability for US - certificated products? Check each box that applies, and describe the appropriate text to be used in the AD. Compliance Time(s) Lim itation section of

AFM/RFM ALS of the ICA

6b. **Product -**  **Type Technical Actions.** Are there product - type technical actions to be applied to the FAA AD that differ from the MCAI or service information? Check each box that applies, or describe other differe nce(s) to be specified in AD: No Flight with Cracks Mandatory

Terminating Action Other:

c. **MCAI Equivalent Actions.** The following differences should only be applied for safety - related technical reasons specific to this unsafe condition or required actions (see FAA Order 8040.5 , Para. 8.c). Check each box that applies where a difference from the MCAI is necessary and document rationale for use. **AIR -**  **140 Manager**  **approval is required for use**  . Contact the Manufacturer Return of Parts Replacement of Parts Spares (Parts installation) Reporting Requirement Other? Explain

7. **IAR Good Cause.** For “Immediately Adopted R ule” (IAR) ADs only: Provide a brief description of the urgency of the corrective action to support a finding of “good cause” (Use text from MCAI or service information where possible). EASA Emergency AD 2012 - 0185 - E calls out:

## FAA MCAI **AD WORKSHEET**  **(CONTINUED)**

Fan blade off on a Tay 6 20 - 15 engine has recently been reported. Subsequent investigation results identified vibration induced by a fan blade flutter as a possible cause of fan blade root failure leading to the blade off. This condition, if not detected and corrected, could lead to the blade failure potentially causing release of high - energy debris, possibly resulting in damage to the aeroplane and/or injury to the occupants. To minimise the potential for further fan blade failure occurrences Rolls Royce Deutschland (RRD) issued a Non - Modification Service Bulletin (NMSB) Alert Tay - 72 -A1775 providing instruction for Low Pressure Compressor (LPC) fan blades inspection. The NMSB Alert Tay - 72 -A1775 was updated to Revision 1 shortly after Initial issue was released due to minor wordi ng correction. For the reasons described above, this AD requires accomplishment of two ultrasonic inspections of the LPC fan blades and, depending of finding, **(1) Before next flight** , after the effective date of this AD, and thereafter before 1 500 engine flight hours (EFH) but not before 1 000 EFH after initial inspection, accomplish an ultrasonic inspection of the LPC fan blades in accordance with RRD NMSB 72 -A1775 Revision 1. accomplishment of a corrective action. 8. **Costs** 8a. Number of U.S. products th at will be affected : 0 Engines 8 b. Provide number of total work hours per product, summing all corrective actions (inspection, modification, on - condition repair, etc.) . Provide cost of parts, if applicable. Or, provide reference to information in the SB . Cost: $ 0 no Engines operating in the US at this time Total Work hours per product: 4 Parts Cost per Product: $ 450,000 ASE estimate 9. **Contacts.** With whom outside the FAA has this proposal been discussed? Organization Person Contacted Date Res ponse EASA Uwe Nickel 9/13 /12 Called, left a message RRD Aissen, Etzard 9/13/12 Discussed the situation and concurs with IAR EASA Karl Hoier 9/13 /12 Called, left a message

## FAA MCAI **AD WORKSHEET**  **(CONTINUED)**

10. **Ferry Permit.** Should a ferry flight permit be: Permitted: Permitte d with Limitations (list on separate sheet) Prohibited: X 11. **Impact Assessments.** Please answer the following questions: a . Is this AD considered ‘significant’ under DOT Regulatory Policies and Procedures (44 FR 11034, 02/26/79) or Executive Order 12 866? _____ Yes

_X ___ No b. Will this AD have a significant economic impact on a substantial number of small entities under the criteria of the Regulatory Flexibility Act? _____ Yes

_X ____ No c. Will this AD have federalism implications under Executive Order 13132? _____ Yes

_X ____ No d. Will this AD have international trade implications? _____ Yes

__X ___ No e. Will this AD have any negative impact on the environment? _____ Yes

__X ___ No f. Will this AD have any negative impact on energy? _____ Yes

_X ____ No

## FAA MCAI **AD WORKSHEET**  **(CONTINUED)**

**Signatures.** Project Engineer: Frederick Zink Date: 9/13 /12 Manager: Date: AIR - 140 Manager (if applicable): Date: AEG Representative (except for appliances): Roger Love Date: 9/ 13/ 12