AD 74-18-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Honeywell International Inc. | TFE731-2 | AIRESEARCH MANUFACTURING COMPANY of ARIZONA Model TFE 731-2-2B Engines |
Unsafe Condition
The hydromechanical fuel control orifice assembly may fail, causing an uncommanded increase in fuel flow, which could result in engine overspeed or flameout.
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Required Actions
Replace the hydromechanical fuel control orifice assembly in accordance with AiResearch Alert Service Bulletin TFE 731-A73-3006 or later FAA approved revisions. Equivalent procedures may be approved by the Chief, Aircraft Engineering Division, FAA Western Region, upon submission of adequate substantiation data.
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Compliance Time
Before further flight
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Affected Aircraft
AiResearch Model TFE 731-2-2B engines installed in, but not limited to Lear-Gates Learjet model 35/36 Aircraft, certificated in all categories.
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Federal Register Abstract
Fuel Control Orifice Assembly
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_74-18-12.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 74-18-12 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: AIRESEARCH MANUFACTURING COMPANY of ARIZONA Model TFE 731-2-2B Engines Subject: Fuel Control Orifice Assembly Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 09/03/1974 Make: Honeywell International Inc. Model: TFE731-2 Product Type: Engine Product Subtype: Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 74-18-12 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1941 AD NUMBER: 74-18-12 SUBJECT HEADING: AIRESEARCH MANUFACTURING COMPANY of ARIZONA Model TFE 731-2-2B Engines ACTION: SUMMARY: DATES: Effective September 3, 1974. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 74-18-12 AIRESEARCH MANUFACTURING COMPANY of ARIZONA: Amendment 39-1941. Applies to AiResearch Model TFE 731-2-2B engines installed in, but not limited to Lear-Gates Learjet model 35/36 Aircraft, certificated in all categories. (A) Before further flight, unless previously accomplished, and prior to the installation of replacement fuel control assemblies, replace the hydromechanical fuel control orifice assembly in accordance with AiResearch Alert Service Bulletin TFE 731-A73-3006, dated August 12, 1974, or later FAA approved revisions. (B) Equivalent procedures may be approved by the Chief, Aircraft Engineering Division, FAA Western Region, upon submission of adequate substantiation data. (C) Aircraft may be flown to a base for performance of maintenance required by this AD per FAR's 21.197 and 21.199. This amendment is effective September 3, 1974, for all persons except those to whom it was made effective immediately by telegram dated August 5, 1974. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_74-18-12.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 74-18-12 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: AIRESEARCH MANUFACTURING COMPANY of ARIZONA Model TFE 731-2-2B Engines Subject: Fuel Control Orifice Assembly Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 09/03/1974 Make: Honeywell International Inc. Model: TFE731-2 Product Type: Engine Product Subtype: Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 74-18-12 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1941 AD NUMBER: 74-18-12 SUBJECT HEADING: AIRESEARCH MANUFACTURING COMPANY of ARIZONA Model TFE 731-2-2B Engines ACTION: SUMMARY: DATES: Effective September 3, 1974. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 74-18-12 AIRESEARCH MANUFACTURING COMPANY of ARIZONA: Amendment 39-1941. Applies to AiResearch Model TFE 731-2-2B engines installed in, but not limited to Lear-Gates Learjet model 35/36 Aircraft, certificated in all categories. (A) Before further flight, unless previously accomplished, and prior to the installation of replacement fuel control assemblies, replace the hydromechanical fuel control orifice assembly in accordance with AiResearch Alert Service Bulletin TFE 731-A73-3006, dated August 12, 1974, or later FAA approved revisions. (B) Equivalent procedures may be approved by the Chief, Aircraft Engineering Division, FAA Western Region, upon submission of adequate substantiation data. (C) Aircraft may be flown to a base for performance of maintenance required by this AD per FAR's 21.197 and 21.199. This amendment is effective September 3, 1974, for all persons except those to whom it was made effective immediately by telegram dated August 5, 1974. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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