UP results in further flap retraction.
Simultaneous extension of the flaps and spoilers
in flight is prohibited because of possible dam-
age to the flaps.
SPOILERS
The spoilers, one located on the upper surface of
each wing forward of the flaps, may be used in
flight for rapid descent, or on the ground for lift
reduction. The spoilers are hydraulically actuat-
ed and electrically controlled by a switch on the
center pedestal. DC control power for the system
is supplied through the SPOILER circuit breaker
on the copilot’s circuit-breaker panel.
Operation
When the SPOILER switch (Figure 15-9) is
positioned to EXT, the spoilers begin to extend
and the red spoiler light illuminates steady. Full
extension is approximately 40º. Returning the
switch to RET causes the spoilers to fully retract
and the spoiler light to extinguish.
Spoiler deployment causes significant nosedown
pitching and should be anticipated and offset
with control pressure and pitch trim.
When RET is selected, the spoilers retract and
are locked down, and the spoiler light goes out.
The resultant noseup pitch motion can be coun-
tered with control pressure and trim.
Figure 15-10 shows a schematic of the
spoiler system.
LEARJET 20 SERIES PILOT TRAINING MANUAL
FlightSafety
international
15-14
FOR TRAINING PURPOSES ONLY
Figure 15-9. Spoiler System
