Normal Spoiler Mode; Autospoilers - BOMBARDIER LEARJET 40 Pilot's Manual

Pilot's Manual

NORMAL SPOILER MODE

The spoilers can be extended symmetrically on the ground or in flight
by moving the spoiler lever aft of the ARM position. Placing the lever
to any position aft of ARM while on the ground will cause full exten-
sion (60°) of the spoilers. Spoiler extension on the ground requires ap-
proximately 1 second and in flight, approximately 5 to 7 seconds. When
the spoiler control lever is placed aft of the ARM position, the RVDTs
will signal the spoileron computer. The computer, in turn, energizes
torque motors on the servo valves to meter hydraulic pressure to the
extend side of the actuators. The computer receives spoiler extension
feedback from the RVDTs attached to the spoiler surfaces, and neutral-
izes the servo valves when the spoilers reach their selected position. In
flight, the amount of spoiler extension will depend on spoiler control
lever position and airspeed.

AUTOSPOILERS

Autospoiler mode is used to automatically extend spoilers on landing
or in an aborted takeoff. When the SPOILER lever is set to ARM, the
system will arm and CAS will illuminate. This will automatically ex-
tend spoilers when the main gear weight-on-wheels switch circuits in-
dicate an "on ground" condition, thrust levers are in the IDLE position
and the airplane has attained 60 knots ground speed. This mode fully
extends spoilers at maximum rate (one second or less) when spoiler
control lever is in the ARM position and autospoiler deploy logic is
met. An autospoiler system is installed to automatically extend both
spoilers in order to spoil lift after landing or during an aborted takeoff.
The following CAS illumination is specific to the autospoiler system:
CAS Color Description
AUTOSPLR ARMED White Autospoilers have been armed.
The main gear weight-on-wheels switch circuits are electronically
latched in the "on ground" state once the initial weight-on-wheels sig-
nal is received. This prevents inadvertent spoiler retraction in the event
the airplane should bounce during the ground roll. If either thrust lever
is moved above IDLE while autospoilers are extended, the spoilers will
immediately retract. Flap position has no effect on autospoiler opera-
tion and autospoilers are not operational when EXT or RET is selected.
The spoileron computer receives power from the L ESS BUS for opera-
tion and the spoiler indicating system receives power from the R ESS
BUS. The circuits are protected by "SPLR CTRL" circuit breaker on the
pilot's circuit breaker panel (FLIGHT group) and the "SPLR IND" cir-
cuit breaker on the copilot's circuit breaker panel (FLIGHT group).
5-10
PM-132A