Operation; Test - BOMBARDIER Challenger 601-3A CL-600-2B16 Pilot Training Manual

OPERATION

The sensing loops are connected in series and
will give a cockpit indication if they detect a
temperature in excess of 375°F in the pylon and
778°F around the engine jet pipe exhaust. (See
Figure 8-12.)
Whenever the temperature exceeds the trip
level, the overheat detection unit illuminates the
red OVHT light on the center instrument panel.
If an overheat occurs, the crew can reduce
power to lower the temperature. If that is un-
successful, the engine must be shut down to
prevent structural damage. When the temper-
ature is reduced below the trip level, the red
OVHT light extinguishes.
Figure 8-12. Engine Jet Pipe/Pylon Overheat Detection System
OVHT
POWER
SUPPLY
LEFT
PYLON
DETECTION
LOOP
375°F
MONITOR
OVERHEAT
RESISTOR
778°F
LEFT
JET PIPE
DETECTION
LOOP
FOR TRAINING PURPOSES ONLY
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CL-600-2B16 PILOT TRAINING MANUAL
Should a loop become shorted, the overheat de-
tection unit illuminates the amber OVHT
WARN FAIL light. This also brings up the
flashing master caution lights and the engine
system light, indicating that a true overheat
cannot be detected.

TEST

Pressing the OVHT switchlight grounds the
loop as in the fire detection warning test. The
red OVHT light illuminates to indicate the
detection system is serviceable.
Pressing the OVHT WARN FAIL switchlight
grounds the loop also. This causes illumination
of the OVHT WARN FAIL light along with an
appropriate master caution system reaction.
ENGINE
ENGINE JET PIPE/PYLON
LEFT RIGHT
OVHT OVHT
OVHT
WARN WARN
FAIL FAIL
PUSH TO TEST
ENG JET
PIPE OVHT
28 VDC
BATT BUS
RT CB-B179
LT-CB-B178
LEFT OVERHEAT
DETECTION UNIT
WARN
FAIL
LOOP
WARN
FAIL
INHIBIT
TRUE
OVHT
MASTER
CAUTION
PRESS TO
RESET
FLASHER
CL 601-3A/R 8-15
L t é e
L t d .