PurposeUSED IN CONJUNCTION WITH THE PRATT & WHITNEY PROVIDED ENGINE CRADLE AND WITH EITHER WORM GEAR DRIVEN HOIST, LEVER OPERATED HOISTS, OR POWERED HOIST SYSTEM FOR THE REMOVAL AND INSTALLATION OF PRATT & WHITNEY ENGINESAirplane777-200, 777-200ER, 777-300Usage CodeMAINTENANCE 