BOMBARDIER Challenger 601-3A CL-600-2B16 Pilot Training Manual page 376

WEIGHT ON WHEELS (WOW)
SYSTEM
The WOW system circuitry processes inputs
from six proximity (WOW) switches (four on
the main gear and two on the nose gear) and
supplies air/ground information to various
systems. The proximity switches electrically
sense position without directly contacting the
operating mechanism (Figure 14-2).
Figure 14-2. Proximity Switch
The WOW system provides on-ground infor-
mation if any one of two left main and any one
of two right main WOW switch is in proxim-
ity. Conversely, an airborne signal is provided
if both WOW switches on either the left or the
right main gear are out of proximity. Any
WOW switch not supplied with electrical
power indicates an airborne condition. Systems
supplied with WOW signals are as follows:
• Thrust reversers
• Electric hydraulic pumps
• Ground spoilers
• Electrical system
CL-600-2B16 PILOT TRAINING MANUAL
Comparator circuitry illuminates the amber
WOW I/P FAIL light beneath the landing gear
control panel (Figure 14-3) if a disagreement
exists between the WOW proximity switches.
A 10- to 15-second delay prevents the light
from illuminating during a normal takeoff or
landing. In addition, the amber WOW O/P
FAIL light illuminates if a system which uses
WOW is not receiving the correct informa-
tion. Spurious illumination of this light is pre-
vented by a 10- to 15-second time delay. The
light also illuminates if electrical power to
either WOW channel is interrupted. (All lights
are shown in Annunciator Panel.)
Figure 14-3. WOW Output/Input Fail Lights
FOR TRAINING PURPOSES ONLY
FlightSafety Canada
• Air conditioning
• Cabin pressurization
• Autopilot
• Antiskid
• Intercom
• Engine
• Cockpit heat
• Stall protection/test
• Nosewheel steering
Lt é e
Lt d .
WOW
O/P FAIL
WOW
I/P FAIL
CL 601-3A/R 14-3