2 ADs indexed for Erickson Air-Crane | Glacier Helicopter, Inc. | Helicopter Transport Services, Inc. | Robinson Air Crane, Inc. | Sikorsky Aircraft Corporation | Siller Helicopters aircraft.
Airworthiness Directives; Sikorsky Aircraft-Manufactured Model CH-54B Helicopters
Unsafe Condition: Failure of the main gearbox second stage lower planetary plate (plate) due to fatigue cracking, which could lead to failure of the main gearbox and subsequent loss of control of the helicopter.
Why matched: Airworthiness Directives; Sikorsky Aircraft-Manufactured Model CH-54B Helicopters
Airworthiness Directives; Sikorsky Models S-61L, S-61N, S-61NM, S-61R, S-62A, S-64A, S-64E, S-64F Helicopters, Including Military CH-3C, HH-3C, CH-3E, HH-3E, and CH-54B Helicopters
Unsafe Condition: Flaking chrome plating from the pistons of Model 66WAP200 and Model 66WAN200 hydraulic pumps with specified serial numbers could lead to hydraulic system contamination and failure.
Why matched: Airworthiness Directives; Sikorsky Models S-61L, S-61N, S-61NM, S-61R, S-62A, S-64A, S-64E, S-64F Helicopters, Including Military CH-3C, HH-3C, CH-3E, HH-3E, and CH-54B Helicopters