ENGINE/APU FIRE CONTROL MODULE - ADJUSTMENT/TEST
1. General
A. This is an optional procedure to verify the engine fire switch functions. The engine
fire control switches are located on the control stand panel P8.
CAUTION: AN ACTUAL ENGINE SHUT-DOWN BY MEANS OF THE FIRE SWITCH IS NOT A RECOMMENDED TEST PROCEDURE.
2. Prepare for Test
A. Provide electrical power (Ref 24-22-0 MP).
B. Set dc voltmeter selector switch on panel P5 to TEST.
C. On power system test module M400 on panel P6, set switch S1 to 2 and switch
S2 to A. Check that dc voltmeter reads 28 volts.
D. Set switch S2 to B and check that dc voltmeter reads 28 volts.
E. Open the valves.
(1)
Open the boost pump circuit breakers on the P6-3 panel.
(2)
Open the igniter circuit breakers on the P6-2 panel.
(3)
Set the engine start switches to IDLE.
(a) Make sure the FUEL VALVED CLOSED lights on the P5 panel come on while the valves are opening and then go out when the valves are fully open (Ref 28-22-0, D & O).
(4)
Set the engine bleed switches to ON.
(a) Make sure the bleed valves move to the open position.
(5)
If the GEN-1 LV or GEN-2 LV light on the M238 panel is on, set the generator switch to ON.
(a) Make sure the GEN-1 LV or GEN-2 LV light goes off.
(6)
Make sure the hydraulic system fluid shutoff valves are open.
F. Prepare the engine fire valves
(1)
Open the left and right fire extinguisher bottle circuit breakers
(2)
Remove these connectors from the engine fire bottles:
(a)
D582 from M194, left bottle squib
(b)
D590 from V24, engine-1 fire valve
(c)
D584 from M195, right bottle squib
(d)
D592 from V25, engine-2 fire valve
(3)
Close the left and right fire extinguisher bottle circuit breakers
3. Test Engine Fire Switch Functions
A. Set TEST switch on the control stand panel P8 to FIRE. Observe that fire warning
switch lights illuminate and that alarm bell sounds.
NOTE: Disregard other warnings which may occur.
B. Press override button under engine-1 fire handle and pull the handle out.
(1)
Set switch S2 on M400 module to A and check that dc voltmeter reads zero.
(2)
Observe that engine-1 FUEL VALVE CLOSED light on panel P5 illuminates bright while valve is in-transit and dims to indicate valve is fully closed (Ref 28-22-0 A/T).
(3)
Observe that hydraulic system A fluid shutoff valve 1, V33, indicator at the valve moves to the closed position.
(4)
Observe that engine-1 bleed air valve indicator at the valve moves to the closed position.
(5)
Make sure the GEN 1 LV light on the M238 panel comes on.
(6)
Set the engine start switch to CUTOFF.
(7)
Check the engine-1 fire extinguishing system
(a)
Rotate the engine-1 fire handle counterclockwise.
1) Check for 0 volts dc between D592 pins 2 and 1.
2) Check for 28 volts dc between D590 pins 2 and 1.
(b)
Rotate the engine-1 fire handle clockwise.
1) Check for 0 volts dc between D592 pins 2 and 1.
2) Check for 28 volts dc between D590 pins 2 and 1.
(c)
Release the engine-1 fire handle.
(8)
Reset the engine-1 fire handle to the normal position.
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May 01/98 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 26-21-41 Page 501
C. Press override button under engine-2 fire handle and pull the handle out.
(1)
Set switch S2 on M400 module to B and check that dc voltmeter reads zero.
(2)
Observe that engine-2 FUEL VALVE CLOSED light on panel P5 illuminates bright while valve is in-transit and dims to indicate valve is fully closed (Ref 28-22-0, A/T).
(3)
Observe that hydraulic system A shutoff valve 2, V34, indicator at the valve moves to the closed position.
(4)
Observe that engine-2 bleed air valve indicator at the valve moves to the closed position.
(5)
Make sure the GEN 2 LV light on the M238 panel comes on.
(6)
Set the engine-2 start switch to CUTOFF.
(7)
Check the engine-2 fire extinguishing system.
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