AD 2017-07-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky | Aircraft Corporation | Airworthiness Directives; Sikorsky Aircraft Corporation Helicopters |
Unsafe Condition
Failure of the engine side drive shaft due to loss of alignment between the lower pulley shaft and the engine output shaft, leading to fracture. Increased cyclic torsional loading inaccurately applied in previous fatigue analysis necessitates reduced life limits.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove from service any engine side drive shaft P/N SKCP2738-7 and pulley side drive shaft P/N SKCP2738-5 that has reached or exceeded its new life limit. Inspect drive shaft alignment and components for cracks, corrosion, pitting, nicks, dents, and scratches. Inspect bolted joints and frames for movement and fretting corrosion. Replace both drive shafts if any inspection fails. Inspect lower pulley to engine alignment and adjust as necessary.
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Compliance Time
Before further flight
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Affected Aircraft
Sikorsky Aircraft Corporation Model 269D and Model 269D Configuration A helicopters with KAflex drive shaft (engine side) P/N SKCP2738-7 and KAflex drive shaft (pulley side) P/N SKCP2738-5 installed.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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