Spoiler Monitor System - BOMBARDIER LEARJET 40 Pilot's Manual

Pilot's Manual

SPOILER MONITOR SYSTEM

The spoileron computer contains a monitor system to prevent electrical
or mechanical faults from causing uncommanded extension or retrac-
tion of the spoilers. The spoileron computer uses electrical power from
the L ESS BUS for operation and the spoiler indicating system uses
power from the R ESS BUS. The circuits are protected by the SPLR
CTRL and SPLR IND circuit breaker, respectively, located in the
FLIGHT group on the pilot's and copilot's circuit breaker panels. If
power to the spoileron computer is lost through the SPLR CTRL or
SPLR IND circuit breaker, the spoilers will retract and be inoperative in
all modes. The spoileron computer performs a self-test (BIT) at power-
up. A test failure will trip the spoileron monitor. If the monitor detects
a self-test failure or a fault during normal operation, hydraulic pressure
is removed from the system by closing the spoiler shutoff valve. A hy-
draulic return is provided to blow the spoilers closed. During normal
operation, the shutoff valve is held open by an electrical solenoid. A
power failure will cause this valve to close. If the monitor does not stow
the spoilers, the crew will initiate the stow with either Control Wheel
Master Switch (MSW). When either MSW is held depressed, the spoiler
shutoff valve is depowered closed and the spoilers will blow down;
however, they may not fully retract.
A system malfunction will cause the spoileron monitor to trip and an
amber CAS display. If the malfunction clears, the system may be reset
using the "SPLRN RESET" position on the system test knob. If the mon-
itor detects a jammed spoiler, the spoileron computer continues to op-
erate using the spoiler that is not jammed and it applies a full retract
input to the effected actuator for 5 to 7 seconds. This will also illuminate
on the CAS.
The following CAS illuminations are specific to the spoileron monitor:
CAS
SPOILERS FAIL
SPOILER JAM
5-14
Color
Amber A failure in the spoiler system is detected.
Amber The associated (L or R) spoiler is jammed.
Description
PM-132A