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When hydraulic stow pressure is removed, the mechanism will return
to a neutral position . Hydraulic stow pressure is applied during the initial
stage of the deploy sequence (overstow), throughout the stow sequence,
and during automatic emergency stow.
THRUST REVERSER CONTROL PANEL
The thrust reverser control panel provides the thrust reverser arm, selftest,
and deploy annunciation functions. The panel is located at the center
of the glareshield, directly above the annunciator panel and is easily
accessible from either crew position. The control panel annunciators
are tested through the pilot's and copilot's light test switch and are automatically
dimmed.
THRUST REVERSER CONTROLSWITCHES
Athrust reverser control switch for each thrust reverser is installed on
the thrust reverser control panel. Each switch has three positions: ARM,
OFF, and TEST The TEST position is momentary. When the switch is
held to TEST, the hydraulic isolation valve section of the associated selector
valve will open and hydraulic pressure for the stow and deploy
sections of the selector valve will be available. Apressure switch in the
selector valve will illuminate the associated ARM light when pressure
is applied. The successful completion of the test indicates the isolation
valve is operating properly. When ARM is selected, the associated
PM-121
Change 3 22-17
Pilot's Manual
Learjet 31A
thrust reverser will be armed for operation (ARM light illuminated) if
the aircraft is on the ground (squat switches depressed) and the associated
main thrust lever is at IDLE. When fully armed (reverser system
relays and switches are properly sequenced), the associated isolation
valve is open and the system is ready for the deploy command. When
the switch is in the OFF position, the associated isolation valve is closed
and hydraulic pressure is not available to operate the thrust reversers.
FILL
VALVE
PRESSURE
GAGE
HYDRAULIC
ACCUMULATOR
(90D-1000 PSI)
THROTTLE
RETARD
MECHANISM
SELECTOR
VALVES
THRUST REVERSERS
Figure 2-4
CHECK
AIRCRAFT
VA
!
HYDRAULIC
SYSTEM
LATCH
ACTUATORS
RETURN
DOOR DOOR
DEPLOY
STOW~
UNLATCH ~$: 'ati
2-18
PM-121 Change 3
Learjet 31A
Pilot's Manual
ARM LIGHTS
Agreen ARM annunciator light for each thrust reverser is installed on
the thrust reverser control panel to annunciate a thrust reverser armed
condition. Each light is operated by a pressure switch between the isolation
section and deploy/stow section of the selector valves. Whenever
the isolation valve is open hydraulic pressure will actuate the switch
which will cause the associated ARM light to illuminate . Illumination
of anARM light with the associated thrust reverser control switch in
the TEST position indicates the associated isolation valve is open. Illumination
of an ARM light with the associated thrust reverser control
switch in the ARM position indicates the associated thrust reverser is
fully armed and will deploy when commanded. The ARM light will
also illuminate during automatic emergency stow to indicate that the
system has self armed.
DEPLOY LIGHTS
An amber DEPLOY annunciator light for each thrust reverser is installed
on the thrust reverser control panel to annunciate thrust reverser
position. A steady DEPLOY light indicates the associated thrust
reverser is fully deployed following a normal deploy sequence. In this
event, the light is operated by a deploy switch on the inboard side of
the blocker door near the hinge point.Aflashing DEPLOY light associated
with a steady ARM light indicates automatic emergency stow has
been activated. In this event, the light is operated by either two inboard
or two outboard latch position switches.
THRUST REVERSER LEVERS
Athrust reverser control lever for each thrust reverser is mounted piggyback
fashion on each main thrust lever. The thrust reverser levers
are inoperable and cannot be moved unless the associated main thrust
levers are at the IDLE stop. Similarly, the main thrust levers cannot be
moved from the IDLE position until the associated thrust reverser levers
are in the stow (full down) position. When fully armed, a thrust reverser
may be deployed by lifting the corresponding thrust reverser
lever to the first (idle/deploy) stop. When the DEPLOY annunciator
light illuminates, a throttle release will activate and the thrust reverser
lever may be pulled beyond the idle/deploy stop to increase reverse
thrust.Astop limits thrust reverser lever travel to maximum reverse at
　
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