The ID plate on the engine's gimbal bearing. It reads
Pratt & Whitney
Aircraft Engine
USAF or BU Model: RL10A-3
Mfrs No.: P 641816
Contract No.: NAS 8-5607
Pratt & Whitney Aircraft
Division of
United Aircraft Corp.
East Hartford, Conn., USA
US
Time picture taken
Sun Aug 23 13:29:26 2009
Location picture taken
Exhibit Galleries
Glenn Research Center
Cleveland, Ohio