Learjet 60 - SPOILER Lever

Pilot's
Manual
Spoileron Mode : During the spoileron
(aileron augmentation) mode,
the spoilers are independently raised and
lowered
in a one-to-one ratio
with
the upgoing aileron to improve lateral control with the flaps full
down .
Aileron augmentation is automatically engaged when the flaps
are lowered beyond 2Y and the SPOILER lever is in the RET
or ARM
position . During the spoileron mode, the computer-amplifier
continu-
ously monitors aileron position through follow-ups on the aileron sec-
tors . As the ailerons move, the computer-amplifier actuates the spoiler
selector and servo valves to control spoiler movement . As one aileron
moves up, the servo
valves
are
positioned so that the spoiler on the
same wing moves up with the aileron while the opposite
spoiler re-
mains retracted . A limit switch for each spoiler limits spoiler extension
to approximately 15' . A monitor circuit will automatically retract both
spoilers and
illuminate
the SPOILER MON light should a malfunction
occur . The spoileron mode
operates on
115 VAC supplied through
the
1-amp SPOILERON circuit breaker on the copilot's circuit breaker
panel .
SPOILER LEVER
Lealet 60
These
valves will apply hydraulic pressure to the spoiler actuators and
cause the spoilers to extend . As the spoilers unseat and extend
through
In the
SPOILER
EXT light
will
illuminate and the computer W11 close
a restrictor bypass to restrict hydraulic flow into the return line . The
spoilers will fully extend in approximately 5 to 7 seconds . Full exten-
sion is approximately 45" . However, during flight, a pressure relief al-
lows the spoilers to "blow dawn"
to a lesser extension
angle
. When
RET is selected, the computer-amplifier will command the servo valves
closed and the selector valve to retract . The selector valve will then ap-
ply hydraulic pressure to the spoiler actuators and cause the spoilers to
retract . When retracted, the spoilers are secured by an internal
locking
mechanism in the actuators . The spoilers will fully retract in approxi-
mately 4 seconds . A monitor circuit will automatically retract both
spoilers and illuminate the SPOILER MON light should a malfunction
occur . Spoiler mode control circuits operate on 28 VDC
supplied
through the 3-amp SPOILER circuit breaker on the copilot's circuit
breaker panel . The spoilers are operative during EMER BUS mode .
Symmetric extension and retraction of the spoilers is controlled
through the SPOILER lever
located on the left side of
the
pedestal adja-
cent to doe thrust levers . The lever has five positions : RET, ARM, two
partial extension detents and EXT . When the switch is set to EXT, both
spoilers will extend and the SPOILER EXT light will illuminate . When
the lever is set to
ARM,
the
autospoiler system will be armed for auto-
matic spoiler extension and
the SPOILER ARM
light will
illuminate .
16
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PM-123
Change 4