![]() ![]() The handle is attached to approximately 8 feet of cable. 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 rocket motors produce the vertical thrust required to separate the canopy from the aircraft. The rocket motor initiators convert ballistic-gas pressure to explosive stimulus, which is transferred through SMDC to fire the canopy jettison rocket motors. Ballistic gas produced by firing the thruster is transferred to the canopy jettison rocket motor initiators. Firing the unlatch thruster pushes the canopy aft to disengage the canopy latches and separates the thruster from the connecting link. The explosive stimulus continues through the emergency escape disconnect, via the FCDC, to the canopy unlatch thruster cartridge, which fires the canopy unlatch thruster. The one-way transfer valve prevents the explosive stimulus from continuing toward the ejection seat components. ![]() Explosive stimulus produced by the initiator is transferred through the SMDC to the emergency escape disconnect. 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. Internal Canopy Jettison Internal canopy jettison is initiated by the internal canopy jettison lever. The following discussion summarizes both jettison procedures. Emergency Escape Disconnect The emergency escape disconnect is located under the canopy deck.PROCEDURES The canopy can be jettisoned by internal or external means. The transfer valve acts as a check valve to prevent the backflow of SMDC detonation to the seat components. One-way Transfer Valve The one-way transfer valve is located on the ballistic panel in the upper equipment bay. The initiator receives inputs from either the internal canopy jettison lever or external canopy jettison handles to initiate the jettison sequence. Canopy Jettison SMDC Initiator The canopy jettison shielded mild detonating cord (SMDC) initiator is located below the canopy jettison lever. 2-11.) The lever gives the pilot the capability of starting the emergency canopy jettison sequence from inside the cockpit. Internal Canopy Jettison Lever The internal canopy jettison lever is located to the left of the main instrument panel. Figure 2-10.-External canopy jettison handle. This single, common cable runs through the bulkhead into the cockpit, where it connects to the internal canopy jettison lever linkage. The cables are routed through the gun bay and are joined to a common cable at the cockpit forward pressure bulkhead. 2-1 and 2-10.) Each handle is attached to approximately 8 feet of cable. External Canopy Jettison Handles And Cables The external canopy jettison handles and cables are stowed behind doors on each side of the aircraft near the radome. COMPONENTS Before discussing the internal and external methods of jettisoning the canopy, a description of the systems components is needed. This is accomplished by pulling the ejection control handle on the ejection seat. It can also be jettisoned by initiating ejection. The canopy can be jettisoned internally or externally without initiating seat ejection. The emergency canopy jettison system provides the capability to ballistically jettison the canopy in case of an emergency. EMERGENCY CANOPY JETTISON SYSTEM Learning Objective: Recognize the system components and procedures for emergency canopy jettison. The actuator is equipped with a mechanical torque limiter that prevents damage to the actuator if excessive torque is applied to the manual backup control mode. The brake engages to hold the canopy at any position when manual cranking is stopped. ![]() Manually operating the canopy overrides the mechanical brake in the canopy actuator. A 3/8-inch drive tool is inserted into the drive receptacle and turned 35☑ turns counterclockwise to open the canopy or clockwise to close the canopy. As previously stated, the canopy external manual drive receptacle is provided to operate the canopy actuator manual drive unit from outside the cockpit. ![]()
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