# Proposed AD FAA-2011-0911: BAE SYSTEMS (Operations) Limited Model 4101 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2011-25-07
- Products: BAE Systems
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: August 31, 2011, 76 FR 54139
- Comments due: October 17, 2011
- Became: [AD 2011-25-07](https://openairdocs.org/ad/2011-25-07)
- Docket: FAA-2011-0911 (https://www.regulations.gov/docket/FAA-2011-0911, where comments are filed)
- Project: 2010-NM-248-AD
- FR document: 2011-22224
- Official PDF: https://openairdocs.org/files/sha256/fc/32/fc32457be5ccf8ec54d2dd1b9670ef1953c03376cfbca5564b89c4ebc2326b9a (from https://www.govinfo.gov/content/pkg/FR-2011-08-31/pdf/2011-22224.pdf)
- Federal Register: https://www.federalregister.gov/documents/2011/08/31/2011-22224/airworthiness-directives-bae-systems-operations-limited-model-4101-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/CBDA9400AD56E902862578FD00488284.0001
- Page: https://openairdocs.org/proposed/FAA-2011-0911

## 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:

A door failure mode has been reported by an operator.

Investigation has shown that the passenger/crew entry door pin- guide plates can fail prior to the expected fatigue life. A metallurgical examination of the failed component (lower guide plate) concluded that the occurred failure was due to exfoliation corrosion.

The current inspection regime is not adequate to identify early stages of this corrosion.

This condition, if not corrected, can lead to the sudden depressurisation of the aeroplane and consequently may injure the occupants.

* * * * *

The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI.

## Notices in this docket

- Aug 31, 2011: Notice of proposed rulemaking (NPRM). (first notice), FR document 2011-22224, comments due Oct 17, 2011 (https://www.federalregister.gov/documents/2011/08/31/2011-22224/airworthiness-directives-bae-systems-operations-limited-model-4101-airplanes)

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