Spoilers shall not be extended at the same time
flaps are extended while inflight except as
specified in the EMERGENCY and/or AB-
NORMAL procedures section of the AFM. An
amber “SPOILERS EXT” message is posted on
the CAS if the flaps are extended more than 3°
and the spoilers are extended any amount.
If spoilers are inoperative inflight, the air-
plane operating altitude is limited to 35,000
feet due to the extended time to make an
emergency descent.
Spoileron Mode of Operation
Spoilerons operate automatically on the
ground and inflight to augment the ailerons
whenever either control wheel is turned more
than 5°. They operate in the pure spoileron
mode if the spoilers have not been extended
through use of the spoiler lever and they op-
erate in a mixed mode if spoiler extension
has been commanded.
Rotation of either control wheel provides a roll
input to the spoileron computer via dual
RVDTs inside of the pilot’s control wheel.
The appropriate spoiler, left or right, extends
to the commanded angle for the current con-
ditions (Mach number, airspeed, AP engage
and flap setting) while the other spoiler is
commanded stowed.
When in the mixed spoiler and spoileron mode,
the spoiler command derived from the spoiler
lever and spoileron command derived from
the control wheel are added to form a com-
posite position. The spoiler command pro-
vides a bias position common to both panels
while the control wheel RVDTs generate a
differential position. The control wheel in-
puts command the angular displacement that
exists between the two spoilers regardless of
the amount of spoilers commanded. Thus,
spoileron commands have priority over spoiler
commands.
If the spoilers are extended to 8°, for exam-
ple, and the control wheel is turned right, the
computer mix logic retracts the left spoiler
first to give differential necessary for the roll
commanded. If that is not enough differential
for the roll commanded, the computer then
extends the right spoiler as required.
Autospoiler Mode of Operation
The autospoiler mode is designed for automatic
extension of the spoilers in the event of an
aborted takeoff and for landings. This mode
fully extends both spoilers at maximum rate
(1 second or less) when the spoiler lever is in
the ARM position and the autospoiler deploy
logic is met.
The autospoiler logic requires:
• both thrust levers to be at idle or cutoff
position and . . .
• both squat switches in the weight-on-
wheels mode, and . . .
• inboard left and inboard right wheel
speed to indicate greater than 60 knots.
Autospoilers will not extend on the ground
prior to flight with the ARM position selected
and the thrust levers at idle until the airplane
has been accelerated to at least 60 knots. Once
the spoilers have deployed automatically, ad-
vancing the thrust levers from idle automati-
cally stows the spoilers.
Roll Disconnect Mode of Operation
In the event that the ailerons become jammed,
the pilot's control wheel can be disconnected
from the aileron control cables and the copi-
lot's control wheel. The pilot’s control wheel
is disconnected from the aileron cables with
a red lever on the hub of the pilot’s control
wheel (Figure 15-9, page 15-8).
In addition to mechanically disconnecting the
pilot’s control wheel from the ailerons, acti-
vation of the roll disconnect lever trips two dis-
connect switches within the control wheel
hub. Regardless of the status of the spoileron
computer, activation of either switch shall en-
gage the roll disconnect mode. If the spoileron
computer had previously been tripped, acti-
vation of either disconnect switch reactivates
the spoileron system.
15-28
FOR TRAINING PURPOSES ONLY
L E A R J E T 4 5
P I L O T T R A I N I N G M A N U A L
FlightSafety
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