# Proposed AD FAA-2010-0614: Rolls-Royce Deutschland Ltd & Co KG Models BR700-710A1-10; BR700-710A2-20; and BR700-710C4-11 Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2010-25-05
- Products: Rolls-Royce Deutschland
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: August 23, 2010, 75 FR 51693
- Comments due: October 7, 2010
- Became: [AD 2010-25-05](https://openairdocs.org/ad/2010-25-05)
- Docket: FAA-2010-0614 (https://www.regulations.gov/docket/FAA-2010-0614, where comments are filed)
- Project: 2010-NE-24-AD
- FR document: 2010-20757
- Official PDF: https://openairdocs.org/files/sha256/79/21/7921f79c21dd33ac540f7906f2576086f7915d6662b140806be9105a1060378b (from https://www.govinfo.gov/content/pkg/FR-2010-08-23/pdf/2010-20757.pdf)
- Federal Register: https://www.federalregister.gov/documents/2010/08/23/2010-20757/airworthiness-directives-rolls-royce-deutschland-ltd-and-co-kg-models-br700-710a1-10-br700-710a2-20
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/1D243DBFB470EC28862577880069059B.0001
- Page: https://openairdocs.org/proposed/FAA-2010-0614

## Summary

We propose to adopt a new airworthiness directive (AD) for the products listed above. This proposed AD results from mandatory continuing airworthiness information (MCAI) issued by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:

Due to manufacturing problems of BR700-710 HP stage 1 and 2 turbine discs it was necessary to re-calculate the Declared Safe Cyclic Life (DSCL) for all BR700-710 HP turbine discs. The analysis concluded that it is required to reduce the approved life limits for the HP turbine disc part numbers that are listed in Table 1 and Table 2 of this AD (MCAI). Exceeding the revised approved life limits could potentially result in non-contained disc failure.

We are proposing this AD to prevent-failure of the high-pressure turbine (HPT) stage 1 and stage 2 discs, uncontained engine failure, and damage to the airplane.

## Notices in this docket

- Aug 23, 2010: Notice of proposed rulemaking (NPRM). (first notice), FR document 2010-20757, comments due Oct 7, 2010 (https://www.federalregister.gov/documents/2010/08/23/2010-20757/airworthiness-directives-rolls-royce-deutschland-ltd-and-co-kg-models-br700-710a1-10-br700-710a2-20)

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