AD 2003-04-15
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky | Aircraft Corporation Model S-76A | Airworthiness Directives; Sikorsky Aircraft Corporation Model S-76A, B, and C Helicopters |
Unsafe Condition
Certain rotor brake discs (RBDs) manufactured by Parker Hannifin Corporation (PHC) were improperly heat treated, resulting in 'soft' RBDs with increased wear rates and a higher likelihood of developing cracks.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Determine the manufacturer of the part-numbered rotor brake disc (RBD). If the manufacturer is Parker Hannifin Corporation (PHC), re-identify the RBD as appropriate. Visually inspect the RBD for cracks before the first flight of the next day following any day in which the RBD was used. If a crack is found, replace the RBD with an airworthy one or deactivate it as applicable.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before the first flight of the next day following any day in which the rotor brake disc (RBD) was used.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Sikorsky Aircraft Corporation Model S-76A, B, and C helicopters equipped with certain part-numbered rotor brake discs (RBDs) manufactured by Parker Hannifin Corporation (PHC).
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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