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the canopy is not in the down and locked position.
0
BOOST Used to close the canopy in cold or hot weather or when headwinds are
greater than 30 to 60 knots.
0
CLOSE Used under all flight conditions.
@
HOLD Used to hold canopy in any position other than closed.
0
OPEN Used to open the canopy under normal conditions,
c9
AUX OPEN Used to open canopy manually, which is required when nitrogen bottle
pressure drops below 225 psi.
0
CANOPY JETTISON Used to jettison canopy.
handle
Figure Z-125. Cockpit Canopy Control Handle and Indicator Lights
2.241
NAVAIR Ol-F14AAD-1
2.37.1.2.1 Open. When OPEN is selected, nitrogen
is ported to the locking actuator through the Contml
module and the canopy is moved aft disengaging the
canopy hooks from the sill hooks. Pneumatic pressure
is then ported to the canopy actuator to raise the canopy.
2.37.1.2.2 Hold. SelectionofCANOPY HOLDduring
transition of the canopy stops the canopy in any
intermediate position between closed and open by pmssurizing
the lock valves in the canopy actuator. These
lock valves stop the transfer of hydraulic fluid.
With the canopy in any intermediate (CANOPY
HOLD) position, moving the handle slowly toward
OPEN will allow the canopy to begin to close until the
handle is Enally in OPEN. This occurs because the fast
motion of the handle moves the selector valve cam,
which vents preasme from the lock valves and allows
the canopy weight to transfer hydraulic fluid. Once the
selector valve cam is completely moved to OPEN,
pressure is then applied to the open side of the canopy
actuator.
If the canopy handle is left in an intemmdiate
position for an extended period, the canopy
will slowly close.
2.37.1.2.3 Close. In CLOSE it allows the canopy to
close under normal conditions (30~knot headwind) using
its own weight without an expenditure of stored
nitrogen. When the control handle is set to CLOSE, both
sides of the canopy actuator are vented to the atmosphere,
allowing the canopy to lower itself. The fti
closing motion actuates a pneumatic timer, which directs
pressure from the control module to the locking
actuatora nd the canopyi s moved forward to engaget he
canopy hooks in the sill hooks.
To close the canopy under high headwind conditions
(30 to 60 knots) or when difficulty is experienced because
of hot or cold temperatums, BOOST is used. The
BOOST mode is activated by rotating the canopy control
handle outboard past the CLOSE stop and pushing
the handle forward. With the control handle in this position,
the control module ports additional regulated
pneumatic pressure to the closed side of the canopy
actuator. If BOOST is used to close the canopy, the
handle should be retumed to CLOSE.
2.37.1.3 Auxiliary Canopy Opening. When the
main pneumatic reservoirp ressureis reducedt o 225 psi,
the canopy control module automatically prevents further
depletiono f reservoir pressurea nd the canopym ust
be opened manually. Actuation of the auxihary mode
can be at&ted Born either the pilot or RIO canopy
control handle or from the ground external canopy control.
To open the canopy from the cockpit in tbis mode,
the canopy control handle in the cockpit must be rotated
outboard to move the handle past the OPEN stop and
then pulled aft to AUX OPEN. This activates a pneumatic
valve, which admits regulated pneumatic pressure
Born an auxiliary nitrogen bottle to the locking actuator
and moves the canopy aft out of the sill locks. When the
canopy isunlocked, pneumatic pressure t+om the main
reservoirisportedtotheopensideofthecanopyactuator
to counterbalanceth e weight of the canopy,a llowing the
canopy to be manually opened or closed by the flight-
Crew.
Before leaving the cockpit, the control handle should
be returned to HOLD. If left in AUX OPEN, the canopy’s
own weight or a tailwind could force the canopy
down with low pressure in the main reservoir. Once the
auxiliary canopy unlock bottle is used, the canopy will
not return to the normal mode of operation and cannot
be locked closed until the auxiliary pneumatic selector
valve on the aft canopy deck is manually reset (lever in
vertical position).
The auxiliary canopy unlock nitrogen bottle is on the
turtlebackbehmdthecanopyhingelme(refertoFO-15).
Servicing of the auxiliary bottle is thnmgh the small
access panel immediately behind the canopy on this
turtleback. A tidly charged bottle will provide approximately
20 canopy cycling operations in the auxiliary
openmode.
2.37.1.4 Canopy Jettison. Tbecanopy canbe jettisoned
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F-14D 飞行手册 Flight Manual 1(175)
