FAA MCAI AD WORKSHEET

Rolls Royce Deutshland Tay 620-15 LP blades

Docket #

 Office File # SP03360EN-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 referenced 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-A1775 Revision 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 UScertificated 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, Unilateral AD action may be necessary. If all criteria for Unilateral AD Action are met (See Order 8040.5), 

insert rationale for differing corrective 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 provide 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)

Limitation 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 difference(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 Rule” (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 620-15 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 wording 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 that will be affected: 0 Engines

8b. 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 Response

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: Permitted 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 12866? _____ 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