AD 78-05-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky Aircraft Corporation | S-58BT | Airworthiness Directives; Sikorsky Model S-58T Series Helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-58DT | Airworthiness Directives; Sikorsky Model S-58T Series Helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-58ET | Airworthiness Directives; Sikorsky Model S-58T Series Helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-58FT | Airworthiness Directives; Sikorsky Model S-58T Series Helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-58HT | Airworthiness Directives; Sikorsky Model S-58T Series Helicopters |
| aircraft | Sikorsky Aircraft Corporation | S-58JT | Airworthiness Directives; Sikorsky Model S-58T Series Helicopters |
Unsafe Condition
Oil-to-fuel heater contamination could cause fuel starvation of the PT6T-3 and PT6T-6 engines.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Relocate the impending fuel bypass sensor lines on both engine power sections following Sikorsky Service Bulletin No. 58B30-12C, dated January 12, 1976.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
prior to May 25, 1978
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Sikorsky Model S-58T series helicopters (S-58BT, S-58DT, S-58ET, S-58FT, S-58HT, S-58JT)
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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