FlightSafety Canada
L t é e
L t d .
CL-600-2B16 PILOT TRAINING MANUAL
CL 601-3A/R
8-13
FOR TRAINING PURPOSES ONLY
loops have cooled sufficiently, the OVHT
switchlight extinguishes. The gear may be re-
tracted in accordance with
AFM
procedure.
Should a loop become shorted, the overheat de-
tection unit will illuminate the amber OVHT
WARN FAIL light. This brings up the master
caution lights and the MLG BAY OVHT FAIL
system annunciator.
TEST
Pressing the OVHT switchlight grounds the
loop through a resistor, causing the loop re-
sistance to drop to a predetermined level-the
OVHT trip point (as in the fire detection warn
test). When the red OVHT light illuminates,
it indicates that:
• The lamp is serviceable.
• The loops have continuity.
• The overheat detection circuit is ser-
viceable.
Pressing the OVHT WARN FAIL switchlight
grounds the loops (as in the fire detection fault
t e s t ) , c a u s i n g i l l u m i n a t i o n o f t h e OV H T
WARN FAIL switchlight along with the ap-
propriate master caution system reaction. This
test determines that the detection unit can de-
tect and indicate a shorted loop.
OVHT
WARN
FAIL
OVHT
LEFT
DETECTION
LOOP
RIGHT
DETECTION
LOOP
LOOP
MONITOR
OVERHEAT
RESISTOR
WARN
FAIL
320
°
F
320
°
F
TRUE
OVHT
WARN
FAIL
INHIBIT
POWER
SUPPLY
28 VDC
BATT BUS
CB-B164
MLG BAY OVERHEAT
DETECTION UNIT
A
R
M/C
(MLG BAY
OVHT FAIL)
OVHT
OVHT
WARN
FAIL
Figure 8-10. MLG Bay Overheat Detection System