AD 94-07-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Honeywell International Inc. | TFE731-2A | ALLIEDSIGNAL, INC. Model TFE731-2A, -3, -3A, -3R, -3AR, -3B, and -3BR Engines |
| engine | Honeywell International Inc. | TFE731-3 | ALLIEDSIGNAL, INC. Model TFE731-2A, -3, -3A, -3R, -3AR, -3B, and -3BR Engines |
| engine | Honeywell International Inc. | TFE731-3A | ALLIEDSIGNAL, INC. Model TFE731-2A, -3, -3A, -3R, -3AR, -3B, and -3BR Engines |
| engine | Honeywell International Inc. | TFE731-3AR | ALLIEDSIGNAL, INC. Model TFE731-2A, -3, -3A, -3R, -3AR, -3B, and -3BR Engines |
| engine | Honeywell International Inc. | TFE731-3B | ALLIEDSIGNAL, INC. Model TFE731-2A, -3, -3A, -3R, -3AR, -3B, and -3BR Engines |
| engine | Honeywell International Inc. | TFE731-3BR | ALLIEDSIGNAL, INC. Model TFE731-2A, -3, -3A, -3R, -3AR, -3B, and -3BR Engines |
| engine | Honeywell International Inc. | TFE731-3R | ALLIEDSIGNAL, INC. Model TFE731-2A, -3, -3A, -3R, -3AR, -3B, and -3BR Engines |
Unsafe Condition
A5 seal cracking and opening can lead to first stage low pressure (LP) turbine disk failure. First stage LP turbine rotor creep can cause rotor lockup during engine start.
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Required Actions
Replace A5 seals with a redesigned seal per specified service bulletins. Revise AFM Limitations Section to include engine and flight data monitoring procedures, N1 rotation verification during start, and checks for rubbing noises and N1 spool lockup post-shutdown. Discontinue flight if issues are detected.
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Compliance Time
Within 150 hours time in service after the effective date if the engine has 500 hours TSN or more, or prior to accumulating 650 hours TSN if less than 500 hours TSN on the effective date.
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Affected Aircraft
AlliedSignal, Inc. (Honeywell International Inc.) TFE731-2A, -3, -3A, -3R, -3AR, -3B, and -3BR engines.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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