with the firing pin relaxed (not precocked) before
handle actuation. The sear mechanism is a
conventional ball-and-node type, which
disengages completely after 3/4-inch of travel.
During travel, the firing pin withdraws, but the
handle does not disengage. The primer fires into
a lead azide charge, which fires the output charge.
The external jettison initiators have no safety pins,
but use a 10-foot lanyard to protect against
inadvertent initiation. Either external initiator will
cause all windows, hatches, fillets, and fillet
supports to blow away from the aircraft.
Window/Hatch Internal Jettison Handle/
Initiator.— Three window/hatch internal jettison
handle/initiators (internal jettison initiators) are
located in the crew compartment: one at the
eyebrow panel and one each at the TACCO and
SENSO instrument panels. The internal canopy/
hatch severance initiators (fig. 6-9) are the
squeeze-to-pull type, which have a quick-release
safety pin in the squeeze segment of the opera-
tion for safetying. The pilot’s/copilot’s handle will
blow all windows and hatches, whereas the
TACCO and SENSO handles will blow only the
hatch above the crew member. The basic internal
jettison handle initiators are similar to the
external jettison handle initiators except for the
handle and the absence of the lanyard feature.
Pilot/NFO Window Severance Linear Shaped
Charge.— A window severance explosive charge
(fig. 6-10) is attached to the inside periphery of
the pilot’s and copilot’s windows. An SMDC
connects to a transfer block at the lower front
corner of the explosive charge. The window
explosive charge is actuated by the pilot’s/
copilot’s internal jettison handle/initiator or by
either external jettison handle/initiators through
the SMDC segments. The explosive charge acts
as the cutting device for the window glass.
Hatch Severance Explosive Charge.— The
hatch severance explosive charge is similar to the
window severance explosive charge. The explosive
charges of the hatches can be actuated by the
external jettison handle/initiators or by the
pilot’s/copilot’s handle/initiator. The TACCO or
SENSO hatch explosive charge can be actuated
individually by the respective TACCO or
SENSO handle/initiator.
Fillet and Fillet Support Explosive Shaped
Charge.— Each right and left upper wing-to-
fuselage fillet has a fillet-severance, explosive
shaped charge attached near the outer and rear
fillet attachments (fig. 6-11). The shape charge
cuts the attached fillet from the aircraft to allow
complete egress of the respective hatch. A fillet
Figure 6-11.—Fillet and fillet support explosive shaped charge.
6-15
