# AD 92-15-02: Engine Mounting System

- Type: Airworthiness directive
- Status: Current
- Products: Textron 400, MU-300 and MU-300-10
- Effective: August 18, 1992
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-8295
- Docket: 92-NM-04-AD
- Registered aircraft: 30 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/23630877D74CD76586256A09006942FD.0001
- DRS record last changed: January 21, 2026
- Page: https://openairdocs.org/ad/92-15-02

## The airworthiness directive

92-15-02 BEECH AIRCRAFT CORPORATION: Amendment 39-8295. Docket No. 92-NM-04-AD.

Applicability: Beech Model 400 airplanes, serial numbers RJ-1 through RJ-65, inclusive; Mitsubishi Model MU-300 airplanes, serial numbers A003SA through A091SA, inclusive; and Mitsubishi Model MU-300-10 airplanes, serial numbers A1001SA through A1011SA, inclusive; certificated in any category.

Compliance: Required as indicated, unless accomplished previously.

To prevent reduced structural integrity of the engine mounting system, accomplish the following:

  (a) Within 200 hours time-in-service after the effective date of this AD, or at the next scheduled inspection interval, whichever occurs first, replace each engine mount nut and bolt with nuts and bolts that have been inspected using magnetic particle techniques (identified by green dye), in accordance with Beechcraft Service Bulletin 2408, dated June 1991 (for Beech Model 400 and Mitsubishi Model MU- 300-10 airplanes); or Mitsubishi Service Bulletin 71-004, dated January 8, 1992 (for Mitsubishi Model MU-300 airplanes); as applicable.

  (b) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, Wichita Aircraft Certification Office (ACO), ACE-115W, FAA, Small Airplane Directorate. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Wichita ACO.

NOTE: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Wichita ACO.

  (c) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate the airplane to a location where the requirements of this AD can be accomplished.

  (d) The replacement shall be done in accordance with Beechcraft Service Bulletin 2408, dated June 1991 (for Beech Model 400 and Mitsubishi Model MU-300-10 airplanes); or Mitsubishi Service Bulletin 71-004, dated January 8, 1992 (for Mitsubishi Model MU-300 airplanes); as applicable. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR Part 51. Copies may be obtained from Beech Aircraft Corporation, P.O. Box 85, Wichita, Kansas 67201-0085. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue SW., Renton, Washington; or at FAA, Wichita Aircraft Certification Office, 1801 Airport Road, Room 100, Mid-Continent Airport, Wichita, Kansas; or at the Office of the Federal Register, 1100 L Street NW., Room 8401, Washington, DC.

  (e) This amendment becomes effective on August 18, 1992.

## Affected data sheets (2) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A16SW](https://openairdocs.org/tcds/A16SW): Textron Aviation Inc.; names 2 of 4 models: 400, MU-300-10
- [TCDS A14SW](https://openairdocs.org/tcds/A14SW): Textron Aviation Inc.; names 1 of 1 models: MU-300

## 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: 30 (30 by airframe model, 0 by engine model)
- Makers: Mitsubishi 17, Beech 13

Models with the most aircraft:

- [Mitsubishi MU-300](https://openairdocs.org/model/mitsubishi-mu-300): 17 aircraft (airframe model)
- [Beech 400](https://openairdocs.org/model/beech-400): 13 aircraft (airframe model)

All 2 models: https://openairdocs.org/ad/92-15-02/models.md
Every aircraft: https://openairdocs.org/ad/92-15-02/aircraft.md

Its text cites no advisory circulars or STCs.

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