# AD 74-11-06: Fuel Control Computer

- Type: Airworthiness directive
- Status: Current
- Products: Honeywell International TFE731-2
- Effective: September 23, 1974
- Superseded by: Nothing supersedes this AD
- Product type: Engine
- Amendment: 39-1962
- Registered aircraft: 1,026 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/CB7F22E4BE338B7A8625685400746586.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/74-11-06

## The airworthiness directive

74-11-06 AIRESEARCH MANUFACTURING COMPANY of ARIZONA: Amendment 39-1853 as amended by Amendment 39-1962. Applies to AiResearch Model TFE731-2-1C and -2-2B engines installed in, but not limited to, AMD-BA Falcon 10 and Lear-Gates Learjet model 35/36 aircraft, certificated in all categories.

Compliance required after the effective date of this AD, as amended, as indicated, unless previously accomplished.

To prevent improper operation of the engine fuel control computer due to voltage transients in the electrical system, accomplish the following:

      (A) Before further engine operation, modify the fuel control computer, P/N 949572-5, in accordance with AiResearch Service Bulletin TFE731-76-3002, dated April 25, 1974, or later FAA-approved revisions; or

      (B) Replace the fuel control computer P/N 949572-5, with a fuel control computer P/N 949572-8.

Note: 1. With regard to the AMD-BA Falcon 10 aircraft, modified per (A) or (B) above, the Secretariat General A L' Aviation Civile (SGAC), in agreement with AiResearch, has advised that no airplane flight manual modification is required. Immediate implementation by operators of the procedures set forth in AiResearch operating information letter, OI731-2, dated April 20, 1974, is urgently recommended by the Federal Aviation Administration.

2. With regard to the Lear-Gates Model 35/36, modified per (A) or (B) above, the FAA- approved AFM provides appropriate operation instructions.

      (C) This is interim AD action. Further modifications are under development by the manufacturer.

      (D) Aircraft may be flown to a base for performance of maintenance required by this AD per FAR's 21.197 and 21.199."

Amendment 39-1853 became effective May 28, 1974, for all persons except those to whom it was made effective immediately by telegram dated May 3, 1974.

This amendment 39-1962 becomes effective September 23, 1974.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS E6WE](https://openairdocs.org/tcds/E6WE): Honeywell Aerospace US LLC; names 1 of 23 models: TFE731-2

## 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: 1,026 (0 by airframe model, 1,026 by engine model)
- Makers: Dassault-Breguet 174, Raytheon 152, Cessna 139, Learjet 138, Gates Learjet 119, Dassault 89, Israel Aircraft Industries 80, British Aerospace 48, Raytheon Corporate Jets 27, Gates Lear Jet 24

Models with the most aircraft:

- [Garrett TFE731 series](https://openairdocs.org/engine/garrett-tfe731-series): 694 aircraft (engine model)
- [Honeywell TFE-731-SER series](https://openairdocs.org/engine/honeywell-tfe-731-ser-series): 291 aircraft (engine model)
- [Alliedsign TFE731 series](https://openairdocs.org/engine/alliedsign-tfe731-series): 17 aircraft (engine model)
- [Honeywell TFE731-2](https://openairdocs.org/engine/honeywell-tfe731-2): 10 aircraft (engine model)
- [Honeywell TFE-731 series](https://openairdocs.org/engine/honeywell-tfe-731-series): 8 aircraft (engine model)
- [Alliedsign TFE731-2](https://openairdocs.org/engine/alliedsign-tfe731-2): 3 aircraft (engine model)
- [Garrett TFE731-2](https://openairdocs.org/engine/garrett-tfe731-2): 3 aircraft (engine model)

All 7 models: https://openairdocs.org/ad/74-11-06/models.md
Every aircraft: https://openairdocs.org/ad/74-11-06/aircraft.md

Its text cites no advisory circulars or STCs.

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