Two external jettison initiators are installed inside access doors, one on each side of the aircraft just below and forward of each windshield

Figure 2-13.- Ground inflation of the canopy seal system.

Table 2-1.- Troubleshooting Chart For Electrically Actuated Canopy Seal System

(fig. 2-14). The initiator consists of a mechanically actuated sealed explosive device containing a handle, four locking balls, a 10-foot wire lanyard, a mechanical firing mechanism, a transfer booster assembly, body shield, and a ball lock mechanism. The 10-foot wire lanyard attaches the handle to a mechanical firing mechanism. The firing mechanism consists of a sear pin, cap, spring, and firing pin enclosed in the body of the initiator. The transfer booster assembly contains a percussion primer, an initiation explosive charge, and an output explosive charge. The transfer booster assembly produces a detonation wave that initiates the SMDC assembly, which is screwed into the initiator's outlet port.

When the initiator handle is pulled, the lock-ing balls will retract and release the handle from the shield. The handle and attached lanyard are pulled the length of the lanyard (10 feet) from the initiator. With the wire lanyard extended to its full length, an additional 0.75-inch movement of the handle will allow the firing pin to separate from the sear pin. The firing pin, which is now disengaged and under spring tension, strikes the percussion primer, which is installed in the transfer booster assembly. The primer ignites the initiation and output explosive charges, pro-ducing a detonation. The detonation wave initiates the SMDC assembly, which is installed in the outlet port of the initiator.

Figure 2-14.- External canopy and hatch jettison initiator.

The external initiators have no safety pins as such, but rely upon the 10-foot lanyard to protect them against inadvertent initiation. Operation of either external handle will cause all four hatches, fillets, and supports to be blown away from the aircraft. Partial withdrawal of any handle is cause for rejection and replacement.