PROCEDURES

PROCEDURES The canopy can be jettisoned by internal or external means. The following discussion summarizes both jettison procedures. Internal Canopy Jettison Internal canopy jettison is initiated by the internal canopy jettison lever. (See fig. 2-11.) By removing the canopy jettison safety pin and pressing down the safety button and pulling the lever aft, the canopy jettison SMDC initiator is fired. Explosive stimulus produced by the initiator is transferred through the SMDC to the emergency escape disconnect. The one-way transfer valve prevents the explosive stimulus from continuing toward the ejection seat components. The explosive stimulus continues through the emergency escape disconnect, via the FCDC, to the canopy unlatch thruster cartridge, which fires the canopy unlatch thruster. Firing the unlatch thruster pushes the canopy aft to disengage the canopy latches and separates the thruster from the connecting link. Ballistic gas produced by firing the thruster is transferred to the canopy jettison rocket motor initiators. The rocket motor initiators convert ballistic-gas pressure to explosive stimulus, which is transferred through SMDC to fire the canopy jettison rocket motors. The rocket motors produce the vertical thrust required to separate the canopy from the aircraft. (See fig. 2-12.) External Canopy Jettison Ground emergency external canopy jettison is started by opening the door on either the left or right side of the aircraft and removing the canopy jettison handle from its retaining clip. The handle is attached to approximately 8 feet of cable. When the cable is fully extended and pulled, the canopy jettison SMDC initiator is fired, which, in turn, initiates the emergency canopy jettison sequence. From this point on, the sequence is the same as internal canopy jettison. The cable action merely bypasses the internal canopy jettison lever. When the canopy is jettisoned, all canopy jettison ballistic devices are spent. WARNING Ensure that the proper canopy jettison safety pin is installed whenever the aircraft is not flying or during any maintenance task performed on the aircraft. 2-13