Bleed-Air Leak Detection - BOMBARDIER Challenger 601-3A CL-600-2B16 Pilot Training Manual

footwarmer and windshield demist manifolds
both have airflow. With the knob pulled all the
way, only the windshield demist manifold re-
ceives airflow.
The fan and the heater are powered by 115 volts
AC. Should the fan not attain adequate speed
within two seconds of starting the system, or
if during operation the fan were to slow down
to an inadequate speed, power will automati-
cally be removed from the fan and the heater.
To protect against a possible overheat, a ther-
mal safety switch is installed within the heater
element housing. Should the temperature be-
come excessive, the thermal safety switch will
deactivate the heater. The fan will continue
to operate to dissipate heat. The system re-
sets itself once the temperature has returned
within the acceptable range.
TEMPERATURE CONTROL
COCKPIT HEAT
ON
COCKPIT
OFF
STANDBY
NORMAL MAN
40 CABIN
TEMP
20
°C
-40
0
-20
TEMP
COLD HOT
Figure 9-10. Temperature Control Panel
BLEED-AIR LEAK
DETECTION
GENERAL
The bleed-air system can operate at extremely
high temperatures and pressures. Therefore,
structural damage and fatigue could result in
catastrophic consequences if leakage occurs.
9-10 CL 601-3R
CABIN
STANDBY
NORMAL MAN
TEMP
COLD HOT
FOR TRAINING PURPOSES ONLY
FlightSafety Canada
CL-600-2B16 PILOT TRAINING MANUAL
Figure 9-11. Copilot's Fascia Panel (AIR
Knob)
The insulation surrounding the bleed-air ducts
has regularly spaced holes and is clasped at
both ends. If a crack or other duct failure oc-
curs, the hot air escaping from the holes in the
duct insulation impinges on two parallel sens-
ing loops that are routed along the ducts. There
are two detection units, each monitoring in-
puts from two detector loops. The left and
right segments of the bleed-air manifold are
the most critical, and parallel loops are in-
stalled in each segment. These loops are iden-
tified as LOOP A and LOOP B, and both must
be grounded to trigger a DUCT FAIL warning.
The system thus provides protection against
a false signal triggering a warning indication
(includes 14-stage single wire).
L t é e
L t d .