AD 77-08-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron Aviation Inc. | 58P | Airworthiness Directives; BEECH Models 58P, 58PA, 58TC and 58TCA Airplanes |
| aircraft | Textron Aviation Inc. | 58PA | Airworthiness Directives; BEECH Models 58P, 58PA, 58TC and 58TCA Airplanes |
| aircraft | Textron Aviation Inc. | 58TC | Airworthiness Directives; BEECH Models 58P, 58PA, 58TC and 58TCA Airplanes |
| aircraft | Textron Aviation Inc. | 58TCA | Airworthiness Directives; BEECH Models 58P, 58PA, 58TC and 58TCA Airplanes |
Unsafe Condition
Failure of engine mount fitting bolts that are not NAS bolts (National Aerospace Standard) could result in engine separation from the airframe.
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Required Actions
Inspect engine mount fitting bolts to verify NAS bolts are installed. Replace non-NAS bolts with NAS1104-7 or NAS1104-7M bolts using new AN960-416L washers and MS21042-4 self-locking nuts, torque to 50-70 inch-pounds. Document compliance in aircraft maintenance records.
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Compliance Time
within the next 100 hours' time in service after the effective date of this AD, with a possible extension up to 110 hours total
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Affected Aircraft
BEECH Models 58P, 58PA, 58TC, 58TCA with specified serial numbers: Models 58P/58PA (TJ-46 thru TJ-74, TJ-76, TJ-78-80, TJ-82-85, TJ-88, TJ-89); Models 58TC/58TCA (TK-7-18, TK-20, TK-21, TK-25, TK-27, TK-30, TK-32, TK-34, TK-37, TK-38)
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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