AUTOMATIC RIPCORD RELEASE, MODEL 451 OPERATION UNDER USUAL CONDITIONS

TM 10-1670-305-23&P AUTOMATIC RIPCORD RELEASE, MODEL 451 0008 00 OPERATION UNDER USUAL CONDITIONS - CONT OPERATING PROCEDURES - CONT WARNING The altitude dial indicates thousands of feet above mean sea level (not above ground level). If altitude dial is incorrectly set, two parachutes may deploy and become entangled, which may result in death of parachutist. 5. Before jumping, verify that altitude dial is set at desired setting. WARNING Do not move the JUMP/OFF switch to jump unless the equivalent pressure altitude inside the aircraft is at least 1,500 feet above the altitude set on the dial. It is imperative that the AR2 remains well above its actuation altitude at all times after the jump/off switch has been moved to jump. If there is a temporary reduction in aircraft altitude, and the AR2 switch is not recycled back to jump after again rising above the actuation altitude, the AR2 will actuate prematurely during the jump, possibly causing deployment of two parachutes which may become entangled, which may result in death of parachutist. CAUTION Move the JUMP/OFF switch between the two detent positions only. Do not force the switch past either detent position. This may damage the internal mechanism of the AR2 and cause a malfunction. NOTE If the dial setting must be changed in flight set the AR2 JUMP/OFF switch to OFF and reset the dial. Do not set the JUMP/OFF switch back to JUMP until the equivalent pressure altitude inside the aircraft is at least 1,500 feet above the new altitude dial setting. 6. Move JUMP/OFF switch to JUMP. Verify that switch is all the way over to detent position. Change 1 0008 00-6