(2)
Push the override button below the APU fire switch.
S 865-139
(3)
Pull up on the APU fire switch.
(a) The lock should be released and the switch pulled out.
S 865-140
(4)
Push the APU fire switch to close.
S 865-056
(5)
Hold the TEST switch to the OVHT/FIRE position.
(a) Make sure that these indications occur: 1) The two FIRE WARN lights on the P7 panel come on. 2) The lights in the APU fire switch come on.
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A
737-300/400/500MAINTENANCE MANUAL
3) The alarm bell in the control cabin operates. 4) The warning horn in the wheel well operates. 5) The fire warning light in the main wheel well flashes.
S 865-110
CAUTION: DO NOT TURN THE FIRE SWITCH WHILE IT IS IN THE OUT POSITION.
_______ THE CONTENTS OF THE FIRE EXTINGUISHER BOTTLE WILL BE LET OUT.
(6) Pull the APU fire switch.
NOTE: The lock must be released without the use of the override
____
button.
S 865-058
(7)
Push the APU fire switch in to close.
S 865-141
(8)
Move the LIGHTS switch on the P2-1 panel to the DIM position.
(a) Make sure that these lights decrease in intensity: 1) The APU fire switch 2) The two FIRE WARN lights
S 215-111
(9) Move the LIGHTS switch on the P2-1 panel to the BRIGHT position.
(a) Make sure these lights go back to their usual intensity. 1) The APU fire switch 2) The two FIRE WARN lights
S 865-116
(10) Release the TEST switch to the off position.
H. Do a test of the fire bell, horn and fire warning circuitry.
S 865-142
(1)
Hold the TEST switch, on the P8-1 panel, to the OVHT/FIRE position.
(2)
Push and release the BELL CUTOUT switch on the P8-1 panel.
S 865-143
NOTE: The results are the same, wether you push the BELL CUTOUT
____ switch, either FIRE WARN switch on the P7 panel, or the HORN CUTOUT switch on the P28 panel.
(a) Make sure that the fire bell and horn make no sound.
NOTE: The fire warning light on the APU Ground Contorl Panel,
____ P28, should stay on continuously after the bell and horn stop making noise.
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A 737-300/400/500MAINTENANCE MANUAL
(b) Make sure that the FIRE WARN lights on the P7 panel go off.
S 865-144
(3)
Release the TEST switch on the P8-1 panel.
S 865-054
(4)
Push and hold the AIR SENSING switch on the E11 shelf, or pull down the squat switch at the right main landing gear.
(a) Make sure the AIR SENSING ON IN AIR indicator on the E11 shalf. is on.
S 865-118
(5) Hold the TEST switch on the P8-1 panel to the OVHT/FIRE position.
(a)
Make sure the fire warning light in the main wheel well flashes.
(b)
Make sure the warning horn for the APU does not make a sound.
S 865-145
(6) Push and release the HORN CUTOUT switch on the P28 panel.
(a) Make sure the fire warning light in the main wheel well comes on continuously.
S 865-146
(7) Release the switches that follow:
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