# AD 93-02-12: Left-Hand Interstage (LH ITT) Circuit Breaker Wiring

- Type: Airworthiness directive
- Status: Current
- Products: Textron 400A
- Effective: March 26, 1993
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-8495
- Docket: 92-NM-183-AD
- Registered aircraft: 298 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DA8BF2B201C9D30086256A09005E3AE7.0001
- DRS record last changed: January 21, 2026
- Page: https://openairdocs.org/ad/93-02-12

## The airworthiness directive

93-02-12 BEECH AIRCRAFT CORPORATION: Amendment 39-8495. Docket 92-NM-183-AD.

Applicability: Model 400A airplanes; serial numbers RK-2 through RK-29, inclusive, RK-31, and RK-32; certificated in any category.

Compliance: Required as indicated, unless accomplished previously.

To prevent the loss of standby power and the possibility of an electrical fire, accomplish the following:

  (a) Within 100 hours time-in-service after the effective date of this AD, inspect the left-hand interstage turbine temperature (LH ITT) circuit breaker wiring, in accordance with Beechcraft Service Bulletin No. 2458 (ATA Code 39-10), dated August 1992. Prior to further flight, correct any discrepancies found, in accordance with the service bulletin.

  (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), 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 inspection shall be done in accordance with Beechcraft Service Bulletin No. 2458 (ATA Code 39-10), dated August 1992. (NOTE: The issue date of Beechcraft Service Bulletin No. 2458 is indicated only on "page 1 of 5"; no other page is dated.) 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 the FAA, Small Airplane Directorate, Wichita Aircraft Certification Office, 1801 Airport Road, Room 100, Mid-Continent Airport, Wichita, Kansas; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC.

  (e) This amendment becomes effective on March 26, 1993.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A16SW](https://openairdocs.org/tcds/A16SW): Textron Aviation Inc.; names 1 of 4 models: 400A

## 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: 298 (298 by airframe model, 0 by engine model)
- Makers: Raytheon 216, Beech 43, Hawker Beechcraft 39

Models with the most aircraft:

- [Raytheon 400A](https://openairdocs.org/model/raytheon-400a): 216 aircraft (airframe model)
- [Beech 400A](https://openairdocs.org/model/beech-400a): 43 aircraft (airframe model)
- [Hawker Beechcraft 400A](https://openairdocs.org/model/hawker-beechcraft-400a): 39 aircraft (airframe model)

All 4 models: https://openairdocs.org/ad/93-02-12/models.md
Every aircraft: https://openairdocs.org/ad/93-02-12/aircraft.md

Its text cites no advisory circulars or STCs.

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