# AD 78-03-05: Cowling Latches

- Type: Airworthiness directive
- Status: Current
- Products: Mitsubishi Heavy Industries MU-2B, MU-2B-10, MU-2B-15, MU-2B-20, MU-2B-25, MU-2B-26, MU-2B-30, MU-2B-35 and MU-2B-36
- Effective: February 23, 1978
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-3137
- Registered aircraft: 63 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/F21F55E74D40512786256A3A00707513.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/78-03-05

## The airworthiness directive

78-03-05 MITSUBISHI HEAVY INDUSTRIES, LTD: Amendment 39-3137. Applies to models MU-2B, MU-2B-10, MU-2B-15, MU-2B-20, MU-2B-25 and MU-2B-26 airplanes with serial numbers up through and including 347 except 313 and 321 and models MU-2B-30, MU-2B-35, and MU-2B-36 airplanes with serial numbers up through and including 696 except 652 and 661. NOTE: This AD is not applicable to MU-2B series airplanes having serial numbers with the suffix "SA." Compliance is required as indicated. To prevent failure of the cowling latches between the engine nacelle upper door and side doors, subsequent separation of the upper cowling panel, and possible loss of control of the airplane, accomplish the following: Within the next 25 hours time in service after the effective date of this AD, unless already accomplished, replace the cowling latch links between the engine nacelle upper door and side doors in accordance with the instructions contained in Mitsubishi MU-2 Service Bulletin No. 171A datedJuly 14, 1975, as supplemented by Mitsubishi MU-2 Service Bulletin No. 180 dated August 26, 1977, or Mitsubishi Service Bulletin No. 180A dated November 17, 1977, or an FAA- approved equivalent, approved by the Chief, Engineering and Manufacturing District Office, FAA, Pacific-Asia Region, Honolulu, Hawaii. This supersedes amendment 39-2695, (41 FR 34009), AD 76-16-05. This amendment becomes effective February 23, 1978.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A2PC](https://openairdocs.org/tcds/A2PC): Mitsubishi Heavy Industries Ltd. 203; names 5 of 7 models: MU-2B, MU-2B-30, MU-2B-20, MU-2B-35, MU-2B-36

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 63 (63 by airframe model, 0 by engine model)
- Makers: Mitsubishi 63

Models with the most aircraft:

- [Mitsubishi MU-2B-25](https://openairdocs.org/model/mitsubishi-mu-2b-25): 23 aircraft (airframe model)
- [Mitsubishi MU-2B-26](https://openairdocs.org/model/mitsubishi-mu-2b-26): 16 aircraft (airframe model)
- [Mitsubishi MU-2B-20](https://openairdocs.org/model/mitsubishi-mu-2b-20): 12 aircraft (airframe model)
- [Mitsubishi MU-2B-36](https://openairdocs.org/model/mitsubishi-mu-2b-36): 7 aircraft (airframe model)
- [Mitsubishi MU-2B-35](https://openairdocs.org/model/mitsubishi-mu-2b-35): 4 aircraft (airframe model)
- [Mitsubishi MU-2B](https://openairdocs.org/model/mitsubishi-mu-2b): 1 aircraft (airframe model)

All 6 models: https://openairdocs.org/ad/78-03-05/models.md
Every aircraft: https://openairdocs.org/ad/78-03-05/aircraft.md

Its text cites no advisory circulars or STCs.

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