Learjet 60 - Page 163

Pilot's Manual
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Leajet60
OVERSPEED
WARNING SYSTEM
The overspeed warning
system
provides an audible overspeed warn-
ing in the event aircraft speed exceeds a Mach or airspeed limit . The
overspeed warning horn is activated by the air data computers when
the position of the airspeed and the maximum allowable airspeed coin-
cide . 28 VDC for system circuits is supplied
through the 7 .5-amp
WARN LTS circuit breakers on the pilot's and copilot's circuit breaker
panels and will be powered during emergency bus operations . The
overspeed warning horn will sound under any of the following condi-
tions :
1 . Airspeed exceeds Vmo,
2 . Mach exceeds Man .
SYSTEM TEST SWITCH - OVERSPEED WARNING FUNCTION
The rotary-type system test switch, located an the center instrument
panel, is used to test the
overspeed
warning
system . The test sequence
is initiated by rotating the system test switch to OVSP and then de-
pressing the switch PRESS TEST button . The overspeed warning will
sound three times, each separated by a brief pause . The third warning
horn will continue until the
TEST button is released .
TAKEOFF WARNING SYSTEM
The takeoff configuration monitor system consists of a monitor box,
throttle quadrant switch and various system switches (provide the in-
put signals to the
monitor box) . The system is active when the aircraft
is on the ground (right squat switch in ground mode) . A takeoff
moni-
tor aural warning will sound during ground operations when the right
thrust lever is advanced to the MCR position or above and one or more
of the following conditions exist :
1 . Thrust reverser unlocked or deployed
.
2 .
Flaps not set for takeoff .
3 . Spoilers
not retracted .
4 . Pitch trim not
in a
safe position for
takeoff .
5 . Parking brake not released .
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