AD 60-19-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky Aircraft Corporation | S-52-3 | Airworthiness Directives; Sikorsky Model S-52-3 Helicopters |
Unsafe Condition
Main Rotor Blade Assembly (P/N S11-10-2200) and Tail Rotor Blades (P/N S11-15-1100) may fail due to fatigue after reaching specified time-in-service. Clutch spindle, clutch spring, free wheel unit spring, and engine fan bolt components may fail due to design deficiencies requiring replacement with redesigned parts.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Retire Main Rotor Blade Assembly (P/N S11-10-2200) at 1,100 hours' time-in-service. Retire Tail Rotor Blades (P/N S11-15-1100) at 1,700 hours' time-in-service. Replace Clutch Spindle (P/N S11-35-2006) with P/N S11-35-2009, Clutch Spring (P/N S11-35-2013) with P/N S11-35-2013-1, Free Wheel Unit Spring (P/N S11-35-2019) with P/N S11-35-2019-1, and Bolt (P/N 13273) with AN 76-10 Bolt. Check AN 76-10 bolt torque every 30 hours' time-in-service, retorque to minimum 370 inch-pounds, replace if below 300 inch-pounds. Inspect DSP4 bearings in rotating scissors and damper arm every 30 hours' time-in-service per Sikorsky Service Information Circular 1110-46, replace bearings every 100 and 300 hours respectively, switch to DSRP4 bearings to discontinue schedule.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Effective immediately for component retirement; effective October 14, 1960 for replacements and inspections. Compliance required as indicated in the AD.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Sikorsky Model S-52-3 helicopters, all serial numbers.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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