AD 60-17-03 R1
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky Aircraft Corporation | S-58A | Airworthiness Directives; Sikorsky Model S-58 Series Helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-58B | Airworthiness Directives; Sikorsky Model S-58 Series Helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-58BT | Airworthiness Directives; Sikorsky Model S-58 Series Helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-58C | Airworthiness Directives; Sikorsky Model S-58 Series Helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-58D | Airworthiness Directives; Sikorsky Model S-58 Series Helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-58DT | Airworthiness Directives; Sikorsky Model S-58 Series Helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-58E | Airworthiness Directives; Sikorsky Model S-58 Series Helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-58ET | Airworthiness Directives; Sikorsky Model S-58 Series Helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-58F | Airworthiness Directives; Sikorsky Model S-58 Series Helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-58FT | Airworthiness Directives; Sikorsky Model S-58 Series Helicopters |
Unsafe Condition
Fatigue failure of the main rotor blade spar due to cracks, internal flaws, or inclusions in the material.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove main rotor blade assemblies with 1,330+ hours' time in service before further flight. Conduct X-ray inspection within specified timeframes for cracks/flaws. Perform daily visual inspections for blades with 500+ hours' time in service. Replace blades with detected issues prior to flight. Extend service life to 3,200 hours if modified and inspected per Service Bulletin 58B15-4K.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Required as indicated unless already accomplished.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Sikorsky Model S-58 series helicopters with main rotor blade assemblies P/N S1615-20100, -2, -4, -5, -6, S1615-20201-1, -2, -7, -8, -13, -14.
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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