# Proposed AD FAA-2011-0035: Airbus Model A300 B4-601, B4-603, B4- 605R, C4-605R Variant F, and F4-605R Airplanes, and A310-204 and -304 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2011-09-10
- Products: Airbus
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: February 1, 2011, 76 FR 5507
- Comments due: March 18, 2011
- Became: [AD 2011-09-10](https://openairdocs.org/ad/2011-09-10)
- Docket: FAA-2011-0035 (https://www.regulations.gov/docket/FAA-2011-0035, where comments are filed)
- Project: 2010-NM-110-AD
- FR document: 2011-2173
- Official PDF: https://openairdocs.org/files/sha256/cd/77/cd77b088c6e369488e01f1ccb0b0f042098204560efb98c247e2d7d5ed1a6179 (from https://www.govinfo.gov/content/pkg/FR-2011-02-01/pdf/2011-2173.pdf)
- Federal Register: https://www.federalregister.gov/documents/2011/02/01/2011-2173/airworthiness-directives-airbus-model-a300-b4-601-b4-603-b4-605r-c4-605r-variant-f-and-f4-605r
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/8C3CFAC1D974D0818625782C0059C8D4.0001
- Page: https://openairdocs.org/proposed/FAA-2011-0035

## 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) originated 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:

Airbus, in the frame of the Extended Service Goal (ESG) exercise, has demonstrated by post-certification analysis that, among the types of yokes in service, one component on the CF6-80C2 forward engine mounts (skinny cast yoke) does not meet the Design Service Goal (DSG) requirements.

This condition, if not corrected, could result in a deterioration of the structural integrity of the forward engine mount.

* * * * *

The unsafe condition is possible separation of the engine from the engine mount during flight. The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI.

## Notices in this docket

- Feb 1, 2011: Notice of proposed rulemaking (NPRM). (first notice), FR document 2011-2173, comments due Mar 18, 2011 (https://www.federalregister.gov/documents/2011/02/01/2011-2173/airworthiness-directives-airbus-model-a300-b4-601-b4-603-b4-605r-c4-605r-variant-f-and-f4-605r)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.