Q3-15.
What is the purpose of the canopy inflatable
OPERATION
seal system?
The canopy seal pressure receives cooled engine
Q3-16.
The canopy seal pressure regulator regulates
bleed air, at approximately 80 psi, from the service air
80-psi bleed air input down to what pressure?
heat exchanger. When the canopy is closed and locked,
Q3-17.
Where does the canopy seal system receive its
the regulator plunger is released; this opens the shutoff
pressure?
valve. Air from the regulator inlet then flows past the
check valve and shutoff valve, through the outlet port to
Q3-18.
What prevents loss of pressure should the air
the canopy inflatable seal. As air pressure in the seal
supply to the system fail?
increases, pressure buildup in the regulator chamber
moves the bellows seat away from the flange. The
CANOPY EMERGENCY JETTISON
interior of the bellows is vented to ambient. When
SYSTEM
pressure in the seal reaches 25 5 psi above ambient,
the bellows has moved sufficiently to seat the shutoff
LEARNING OBJECTIVE: Describe the
seal, which fills the gap between the canopy frame and
components and operation of the canopy emer-
the mating aircraft structure, preventing loss of cockpit
gency jettison system.
pressure. If pressure downstream of the regulator
The canopy emergency jettison system jettisons the
increases to 6 to 8 psi above the regulated pressure,
canopy clear of the cockpit during emergency
additional bellows movement causes the relief valve
conditions that necessitate seat ejection and/or
stem to unseat the ball in the seat to vent the excess
ditching. The canopy is jettisoned clear of the cockpit
pressure through the relief/vent port. The check valve
for normal ejection mode. Through the use of
prevents loss of pressure from the inflatable seal should
pyrotechnics, the canopy is automatically unlocked and
the air supply to the system fail.
jettisoned when ejection is initiated. It also may be
When the canopy is unlocked, the regulator plunger
jettisoned without initiating ejection by the aircrew
is depressed. The plunger moves the bellows seat
(with canopy jettison initiator handles in the aircraft) or
toward the relief valve stem to close the shutoff valve
by a groundcrew (with an external canopy jettison
and unseat the ball, venting downstream pressure
initiator handle at each side of the aircraft). Figure 3-5
through the relief/vent port.
FLEXIBLE C NFINED
DETONATING CORD
EXPANDING SHIELDED
(FCDC) (2)
MILD DETONATING
CORD (XSMDC) (20
ONE-WAY
EXPLOSIVE
TRANSFER (8)
CANOPY LOCK
HOOKS (14)
SHIELDED MILD
DETONATING CORD
(SMDC)
EXPLOSIVE
MANIFOLDS (13)
EXPLOSIVE
MANIFOLD
EXPLOSIVE
FLEXIBLE CONFINED
DETONATING CORD
(FDC) (2)
EXPLOSIVE
MANIFOLD
ONE-WAY
EXPLOSIVE
TRANSFER
EXPLOSIVE
FORWARD
BULKHEAD
PILOT
AFT
BULKHEAD
INERT CONNECTOR
(TEE) (TYPICAL)
INERT CONNECTOR
(INLINE) (TYPICAL)
INERT CONNECTOR
o
(90 ) (TYPICAL)
AMEf0305
Figure 3-5.--Canopy emergency jettison system components.
3-8
