Purpose-2, -5, & -24 ARE USED TO PREVENT T/R OPERATION IN FLIGHT. -1, -8, -14, & -24 ARE USED TO PREVENT T/R OPERATION ON GROUND DURING MAINTENANCE & ALLOWS MANUAL OPERATION OF THURST REVERSER. -43 USED ON 747-8 TO HOLD T/R ACTUATOR & TRACK LOCK, IN UNLOCK POSITIAirplane767Usage CodeMAINTENANCE 