# Proposed AD FAA-2009-0637: Construcciones Aeronauticas, S.A. (CASA), Model CN-235 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2009-26-14
- Products: Construcciones Aeronauticas
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: July 15, 2009, 74 FR 34272
- Comments due: August 14, 2009
- Became: [AD 2009-26-14](https://openairdocs.org/ad/2009-26-14)
- Docket: FAA-2009-0637 (https://www.regulations.gov/docket/FAA-2009-0637, where comments are filed)
- Project: 2008-NM-183-AD
- FR document: E9-16762
- Official PDF: https://openairdocs.org/files/sha256/53/77/5377c5d19fcf407396dc44a38c97db8c1eb4fa43933a447f11826d861abd23cc (from https://www.govinfo.gov/content/pkg/FR-2009-07-15/pdf/E9-16762.pdf)
- Federal Register: https://www.federalregister.gov/documents/2009/07/15/E9-16762/airworthiness-directives-construcciones-aeronauticas-sa-casa-model-cn-235-series-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/4811547311FDA6F2862575F400610EA0.0001
- Page: https://openairdocs.org/proposed/FAA-2009-0637

## Summary

We propose to adopt a new airworthiness directive (AD) for the products listed above that would supersede an existing AD. 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:

* * * [C]racks [were originally] detected on some CN-235 aircraft in flap fittings P/N 35-15501-0101, -0102, -0201 and -0202, attaching the structure of the outer flaps to their rear supports and, in the adjacent structure, DGAC Spain issued AD Nr. 01/97[.] * * * Since AD 1/97 Rev.1 was published, similar cracks have been detected in flaps longerons. * * * * * * * *

Fatigue cracking of the rear internal support fittings and longerons of the outer flap structure could result in failure of the outer flaps, and consequent reduced controllability of the airplane. The proposed AD would require actionsthat are intended to address the unsafe condition described in the MCAI.

## Notices in this docket

- Jul 15, 2009: Notice of proposed rulemaking (NPRM). (first notice), FR document E9-16762, comments due Aug 14, 2009 (https://www.federalregister.gov/documents/2009/07/15/E9-16762/airworthiness-directives-construcciones-aeronauticas-sa-casa-model-cn-235-series-airplanes)

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