AD 97-02-13
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JFTD12A-4A (T73P-1) | Airworthiness Directives; Pratt & Whitney JFTD12A Series and T73 Series Turboshaft Engines |
| engine | Pratt & Whitney Division | JFTD12A-5A (T73-P-700) | Airworthiness Directives; Pratt & Whitney JFTD12A Series and T73 Series Turboshaft Engines |
Unsafe Condition
Disk rupture, an uncontained engine failure, and possible damage to the aircraft due to extensive compressor rotor part cracking.
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Required Actions
Perform fluorescent penetrant inspections (FPI) of compressor hubs, second and third stage disks, spacers, and bolted on (rotating) airseals for cracks. Replace cracked parts with serviceable parts. Repetitive FPI required at intervals not exceeding 1,500 hours TIS for affected parts, except first and fourth through ninth stage disks which have 3,000 hours TIS intervals.
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Compliance Time
Prior to further flight for engines exceeding specific time-in-service (TIS) thresholds on the effective date (April 4, 1997). Initial inspections must be done by specific TIS thresholds (e.g., 2,200 hours TIS for some engines, 1,500 hours TIS for others). Repetitive inspections at intervals not exceeding 1,500 or 3,000 hours TIS as specified.
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Affected Aircraft
Pratt & Whitney Models JFTD12A-4A and -5A, and T73-P-1 and -P-700 turboshaft engines installed on but not limited to Sikorsky S-64 series and CH-54 series aircraft.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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