AD 98-17-01 R1
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Honeywell International Inc. | TFE731-2 | Airworthiness Directives; AlliedSignal Inc. TFE731 Series Turbofan Engines |
| engine | Honeywell International Inc. | TFE731-2A | Airworthiness Directives; AlliedSignal Inc. TFE731 Series Turbofan Engines |
| engine | Honeywell International Inc. | TFE731-2B | Airworthiness Directives; AlliedSignal Inc. TFE731 Series Turbofan Engines |
| engine | Honeywell International Inc. | TFE731-2BR | Airworthiness Directives; AlliedSignal Inc. TFE731 Series Turbofan Engines |
| engine | Honeywell International Inc. | TFE731-2C | Airworthiness Directives; AlliedSignal Inc. TFE731 Series Turbofan Engines |
| engine | Honeywell International Inc. | TFE731-3 | Airworthiness Directives; AlliedSignal Inc. TFE731 Series Turbofan Engines |
| engine | Honeywell International Inc. | TFE731-3A | Airworthiness Directives; AlliedSignal Inc. TFE731 Series Turbofan Engines |
| engine | Honeywell International Inc. | TFE731-3AR | Airworthiness Directives; AlliedSignal Inc. TFE731 Series Turbofan Engines |
| engine | Honeywell International Inc. | TFE731-3B | Airworthiness Directives; AlliedSignal Inc. TFE731 Series Turbofan Engines |
| engine | Honeywell International Inc. | TFE731-3BR | Airworthiness Directives; AlliedSignal Inc. TFE731 Series Turbofan Engines |
Unsafe Condition
Cracked fuel tubes and subsequent leakage of fuel on or around electrical components, which can cause an engine fire.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Install an improved flexible fuel tube within 160 hours time-in-service after the effective date or prior to December 20, 1999. For Learjet 35, 36, and 55 engines, the improved flex tube and clamp assembly on the original rigid fuel tube are optional. Alternative methods of compliance may be approved by the FAA.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 160 hours time-in-service after the effective date or prior to December 20, 1999, whichever occurs first
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
AlliedSignal Inc. TFE731-2, -3, and -4 series turbofan engines with specific fuel tubes installed on airplanes including Learjet 35, 36, 55 series, Cessna Citation models, and others.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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