AD 97-04-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Honeywell International Inc. | TFE731-2A | Airworthiness Directives; AlliedSignal Inc. TFE731 Series Turbofan Engines |
| engine | Honeywell International Inc. | TFE731-3C | Airworthiness Directives; AlliedSignal Inc. TFE731 Series Turbofan Engines |
| engine | Honeywell International Inc. | TFE731-3CR | Airworthiness Directives; AlliedSignal Inc. TFE731 Series Turbofan Engines |
Unsafe Condition
Fatigue cracking and subsequent uncontained failure of first stage low pressure turbine (LPT) seal plates, Part Numbers 3073552-2 and 3074053-1, due to machined geometry not meeting design intent from drawing ambiguity.
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Required Actions
Remove from service first stage LPT seal plates P/N 3073552-2 and 3074053-1 prior to accumulating 3,700 cycles since new (CSN), and replace with serviceable parts in accordance with AlliedSignal Inc. Service Bulletin TFE731-72-3573.
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Compliance Time
Prior to accumulating 3,700 cycles since new (CSN)
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Affected Aircraft
AlliedSignal Inc. (now Honeywell International Inc.) TFE731-2A, TFE731-3C, and TFE731-3CR series turbofan engines with first stage LPT seal plates P/N 3073552-2 and/or 3074053-1 installed on Cessna Model 650 Citation III and Israel Aircraft Industries Model 1125 Westwind Astra aircraft.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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