AD 2013-23-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky Aircraft Corporation | Various | Airworthiness Directives; Erickson Air-Crane Incorporated Helicopters (Type Certificate Previously Held by Sikorsky Aircraft Corporation) |
| aircraft | Sikorsky | Various | Airworthiness Directives; Erickson Air-Crane Incorporated Helicopters (Type Certificate Previously Held by Sikorsky Aircraft Corporation) |
Unsafe Condition
A crack in the main rotor blade, which could result in blade separation and subsequent loss of control of the helicopter.
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Required Actions
Before further flight, visually check the Blade Inspection Method (BIM) pressure indicators of the main rotor blades for a black or red color indication. Replace any blade with a black or red color indication unless the indication is due to BIM system malfunction. Repeat the visual BIM pressure indicator check at specified intervals based on helicopter usage. Check the BIM pressure indicator for proper function prior to the first flight of each day.
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Compliance Time
Before further flight
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Affected Aircraft
Erickson Air-Crane Incorporated Model S-64E and S-64F helicopters with main rotor blades part number 6415-20201-043, -045, -047, -048, -049, -050, -051, or 6415-20601-041, -042, -043, -044, -045, -046, -047, -048, -049, -050, -051, or -052.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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