AD 96-15-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | Military R-1340 Series | Airworthiness Directives; Pratt & Whitney Wasp Series and R-1340 Series (Military) Reciprocating Engines |
| engine | Pratt & Whitney Division | Wasp S1H1 | Airworthiness Directives; Pratt & Whitney Wasp Series and R-1340 Series (Military) Reciprocating Engines |
| engine | Pratt & Whitney Division | Wasp S1H1-G | Airworthiness Directives; Pratt & Whitney Wasp Series and R-1340 Series (Military) Reciprocating Engines |
| engine | Pratt & Whitney Division | Wasp S3H1 | Airworthiness Directives; Pratt & Whitney Wasp Series and R-1340 Series (Military) Reciprocating Engines |
| engine | Pratt & Whitney Division | Wasp S3H1-G | Airworthiness Directives; Pratt & Whitney Wasp Series and R-1340 Series (Military) Reciprocating Engines |
Unsafe Condition
Crankshaft counterweight cracking adjacent to the 4 1/2 order flyweight, which could result in engine failure and damage to or loss of the aircraft.
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Required Actions
Perform initial and repetitive visual and dye penetrant inspections of crankshaft counterweights for cracks. Replace cracked counterweights with improved FAA-PMA crankshaft counterweights (P/N 90133-1 and 90134-1) at the next overhaul or if a crack is found during inspection.
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Compliance Time
Initial inspection must be performed within 300 hours time in service (TIS), with repetitive inspections every 150 hours TIS.
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Affected Aircraft
Pratt & Whitney Wasp S1H1, S3H1, and R-1340-AN-1 (military) engines with Air Tractor, Inc. PMA crankshafts (P/N 90114).
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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