AD 97-21-07 R1
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Honeywell International Inc. | T53-L-703 | Airworthiness Directives; AlliedSignal Inc. (formerly Textron Lycoming) Model T5313B, T5317A, and T53 (Military) Turboshaft Engines |
| engine | Honeywell International Inc. | T5313B | Airworthiness Directives; AlliedSignal Inc. (formerly Textron Lycoming) Model T5313B, T5317A, and T53 (Military) Turboshaft Engines |
| engine | Honeywell International Inc. | T5317A | Airworthiness Directives; AlliedSignal Inc. (formerly Textron Lycoming) Model T5313B, T5317A, and T53 (Military) Turboshaft Engines |
| engine | Honeywell International Inc. | T5317A-1 | Airworthiness Directives; AlliedSignal Inc. (formerly Textron Lycoming) Model T5313B, T5317A, and T53 (Military) Turboshaft Engines |
Unsafe Condition
Accessory drive carrier assembly failure, which could result in an N2 overspeed and an uncontained engine failure.
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Required Actions
Perform a one-time visual inspection of accessory drive carrier assemblies for affected serial numbers (S/Ns) designating a defective assembly, and if applicable, replace with a serviceable assembly as described in specified AlliedSignal Inc. Alert Service Bulletins.
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Compliance Time
Effective July 6, 1998.
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Affected Aircraft
AlliedSignal Inc. (formerly Textron Lycoming) Model T5313B, T5317A series commercial turboshaft engines, and T53 series military turboshaft engines approved for installation on aircraft certified under Section 21.25 of the FAR, with accessory drive carrier assemblies part numbers 1-070-220-03, 1-070-220-12, and 1-070-220-13 installed after November 1, 1985, and having serial numbers listed in specified Alert Service Bulletins. These engines are installed on Bell Helicopter Textron Model 205A-1 and 205B series helicopters and listed military helicopters.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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