Airworthiness Directive · Amendment 39-10920 · Hamilton Standard 54H60 Series Propellers
Hamilton Standard 54H60 Series Propellers
Hamilton Standard Models 54H60-77, -91, -117, - 123, and -125 propellers, with propeller blades identified by serial number (S/N) in Hamilton Standard Alert Service Bulletin (ASB) No. 54H60-61-A134, Revision 1, dated June 24, 1998, and ASB No. 54H60- 61-A135, dated June 24, 1998. These propellers are installed on but not limited to Lockheed L100, L188, L200, L288, L382, C130, P-3, and General Dynamics (Convair) CV580 and Guppy aircraft.
This amendment adopts a new airworthiness directive (AD) that is applicable to Hamilton Standard 54H60 series propellers. This action requires affected propeller blades to be removed from service and shipped to designated repair facilities for inspection for insufficient cold rolling of the beveled radius of the blade flange. Affected blades are identified by serial number. This amendment is prompted by reports of propeller blades that cracked due to incomplete cold rolling in the beveled radius area of the blade flange. The actions specified in this AD are intended to prevent propeller blade cracks due to incomplete cold rolling during manufacture, which can result in propeller blade separation and damage to the aircraft.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Propellers
