# Proposed AD FAA-2012-0890: Hughes Helicopters, Inc., and McDonnell Douglas Helicopter Systems (Type Certificate Currently Held by MD Helicopters, Inc.) Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2013-05-16
- Products: MD Helicopter
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: August 29, 2012, 77 FR 52264
- Comments due: October 29, 2012
- Became: [AD 2013-05-16](https://openairdocs.org/ad/2013-05-16)
- Docket: FAA-2012-0890 (https://www.regulations.gov/docket/FAA-2012-0890, where comments are filed)
- Project: 2011-SW-019-AD
- FR document: 2012-21277
- Official PDF: https://openairdocs.org/files/sha256/a2/74/a274a1cf5a17975c0c4e5fc7946d51ca438ed55d6b28192277f0ae191f4db41d (from https://www.govinfo.gov/content/pkg/FR-2012-08-29/pdf/2012-21277.pdf)
- Federal Register: https://www.federalregister.gov/documents/2012/08/29/2012-21277/airworthiness-directives-hughes-helicopters-inc-and-mcdonnell-douglas-helicopter-systems-type
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/6E334C42B1A2F69986257A69004C412D.0001
- Page: https://openairdocs.org/proposed/FAA-2012-0890

## Summary

We propose to adopt a new airworthiness directive (AD) for MD Helicopters, Inc. (MDHI) Model 369D, 369E, 369F, and 369FF helicopters with certain serial-numbered tailboom assemblies. This proposed AD is prompted by the discovery of short-edge margin conditions on two tailboom assemblies. The proposed actions are intended to detect a short-edge margin condition, to modify the tailboom by adding a longeron doubler over the area with the short-edge distance, and to prevent failure of the tailboom and subsequent loss of control of the helicopter.

## Notices in this docket

- Aug 29, 2012: Notice of proposed rulemaking (NPRM). (first notice), FR document 2012-21277, comments due Oct 29, 2012 (https://www.federalregister.gov/documents/2012/08/29/2012-21277/airworthiness-directives-hughes-helicopters-inc-and-mcdonnell-douglas-helicopter-systems-type)

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