(6)
Make a check of the electrical bond between each detector element and the engine case (Ref 20-22-01).
(a) The resistance must be not more than 0.005 ohms.
(7)
Close the fan cowl panels (Ref 71-11-11).
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D. Test the Operation of the Fire Warning System
(1)
Make sure these circuit breakers on the P6-2 panel are open:
(a)
FIRE PROTECTION DETECTION - ENG 1
(b)
FIRE PROTECTION DETECTION - APU
(2)
Close the FIRE PROTECTION DETECTION - ENG 2 CIRCUIT BREAKER ON THE P6-2 panel.
(3)
Hold the TEST switch on the P8-1 panel to the FIRE position.
(4)
Make sure that these indications occur:
(a)
All of the lights in the engine-2 fire switch come on
(b)
The two FIRE WARN lights on the P7 panel come on
(c)
The alarm bell in the control cabin operates
(5)
Release the TEST switch on the P8-1 panel.
(6)
Make sure there are no fire indications.
(7)
Close the FIRE PROTECTION DETECTION - ENG 1 circuit breaker on the P6-2 panel.
(8)
Open the FIRE PROTECTION DETECTION - ENG 2 circuit breaker on the P6-2 panel.
(9)
Hold the TEST switch on the P8-1 panel to the FIRE position.
(10)
Make sure these indications occur:
(a)
All of the lights in the engine-1 fire switch come on
(b)
The two FIRE WARN lights on the P7 panel come on
(c)
The alarm bell in the control cabin operates.
(11)
Release the TEST switch on the P8-1 panel.
(12)
Make sure there are no fire indications.
(13)
Close these circuit breakers on the P6-2 panel:
(a)
FIRE PROTECTION DETECTION - ENG 2
(b)
FIRE PROTECTION DETECTION - APU
(14)
Hold the TEST switch on the P8-1 panel to the OVHT position.
(15)
Make sure these lights on the P8-1 panel come on:
(a)
The ENG 1 OVERHEAT light
(b)
The ENG 2 OVERHEAT light
(16)
Make sure these indications on the P7 panel come on:
(a)
The two MASTER CAUTION lights
(b)
The OVHT/DET annunciator
(17)
Release the TEST switch on the P8-1 panel.
(18)
Make sure there are no overheat indications.
(19)
Try to pull the engine 1, the engine 2, and the APU fire switches on the P8-1 panel; the switches must stay in the locked position.
(20)
Push the override button below the engine-1 fire switch.
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.
(21)
Pull up on the engine-1 fire switch, the lock should be released and the switch pulled out.
(22)
Push the override button below the engine-2 fire switch.
(23)
Pull up on the engine-2 fire switch, the lock should be released and the switch pulled out.
(24)
Push the override button below the APU fire switch.
(25)
Pull up on the APU fire switch, the lock should be released and the switch pulled out.
(26)
Push in the engine-1 fire switch to close.
(27)
Push in the engine-2 fire switch to close.
(28)
Push in the APU fire switch to close.
(29)
Make sure that the two OVHT DET switches on the P8-1 panel are in the NORM position.
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Oct 20/90 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 26-11-0 Page 505
E. Do the test of the circuits that stop the aural and visual fire warnings.
(1)
Hold the TEST switch on the P8-1 panel to the FIRE position.
(2)
Make sure these lights on the P8-1 panel come on:
(a)
All of the lights in the engine-1 fire switch
(b)
All of the lights in the engine-2 fire switch
(c)
All of the lights in the APU fire switch
(3)
Make sure the two FIRE WARN lights on the P7 panel come on.
(4)
Make sure the alarm bell in the control cabin operates.
(5)
Make sure the warning horn in the main wheel well operates.
(6)
Make sure the fire warning light in the main wheel well flashes.
(7)
Push the FIRE WARN switch on the left side of the P7 panel momentarily.
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