As previously stated, the canopy external
manual drive receptacle is provided to operate the
canopy actuator manual drive unit from outside
the cockpit. A 3/8-inch drive tool is inserted into
the drive receptacle and turned 35±1 turns
counterclockwise to open the canopy or clockwise
to close the canopy.
Manually operating the canopy overrides the
mechanical brake in the canopy actuator. The
brake engages to hold the canopy at any position
when manual cranking is stopped. 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.
EMERGENCY CANOPY JETTISON
SYSTEM
Learning Objective: Recognize the system
components and procedures for emergency
canopy jettison.
The emergency canopy jettison system
provides the capability to ballistically jettison the
canopy in case of an emergency. The canopy can
be jettisoned internally or externally without
initiating seat ejection. It can also be jettisoned
by initiating ejection. This is accomplished by
pulling the ejection control handle on the ejection
seat.
COMPONENTS
Before discussing the internal and external
methods of jettisoning the canopy, a description
of the system’s components is needed.
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. (See figs. 2-1 and
2-10.) Each handle is attached to approximately
8 feet of cable. The cables are routed through the
gun bay and are joined to a common cable at the
cockpit forward pressure bulkhead. This single,
common cable runs through the bulkhead into the
cockpit, where it connects to the internal canopy
jettison lever linkage.
Figure 2-10.-External canopy jettison handle.
Internal Canopy Jettison Lever
The internal canopy jettison lever is located
to the left of the main instrument panel. The lever
is mounted on the canopy sill. (See fig. 2-11.) The
lever gives the pilot the capability of starting the
emergency canopy jettison sequence from inside
the cockpit.
Canopy Jettison SMDC Initiator
The canopy jettison shielded mild detonating
cord (SMDC) initiator is located below the canopy
jettison lever. The initiator receives inputs from
either the internal canopy jettison lever or external
canopy jettison handles to initiate the jettison
sequence.
One-way Transfer Valve
The one-way transfer valve is located on the
ballistic panel in the upper equipment bay. The
transfer valve acts as a check valve to prevent the
backflow of SMDC detonation to the seat
components.
Emergency Escape Disconnect
The emergency escape disconnect is located
under the canopy deck. The disconnect provides
a path for SMDC detonation to the canopy
2-10
