(m)
Press captain's BELOW G/S indicator. Check that G/S warning goes off.
(n)
Very slowly reduce radio altitude to 0 feet. Check that G/S warning remains off.
(o)
Increase radio altitude to 1500 feet, then reduce to 900 feet. Press captain's BELOW G/S indicator. Check that no warning occurs.
(p)
Increase glide slope deviation signal to 2.5-dot fly-up and slowly reduce radio altitude to 200 feet. Check that no warning occurs.
(q)
Slowly reduce radio altitude to 0 feet. Check that no warning occurs.
(6)
Test Decision Height Warning (On GUN ALL)
(a)
Simulate a 200-foot radio altitude.
(b)
Increase decision height by adjusting MDA cursor on captain's LRRA indicator until MDA (or DH) light comes on.
(c)
Check that two cycles of MINIMUM aural warning occurs.
(7)
Restore airplane to normal.
(a)
Slowly relieve pitot static system and remove test adapters.
(b)
Return flap system to normal.
(c)
Reset radio altitude to normal and disconnect test simulator.
(d)
If no longer required, remove electrical power.
5C8
Feb 20/89 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 34-42-01 Page 505
GPWS CONTROL MODULE - SERVICING (BULB REPLACEMENT)
1. General
A. This subject has one task. The task is for replacement of the bulb. It is also necessary to do a test of the bulb operation.
2. GPWS Control Module Switch/Indicator Bulb Replacement
A. Standard Tools and Equipment
(1) Lamp - 5 volts, 60ma - P/N MS24515-685
B. References
(1) 24-22-0, Manual Control (Apply Power)
C. Procedure
(1) Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a)
P18
1) GND PROX WARN
(b)
P6
1) DIM & TEST and INDICATOR LIGHTS
CAUTION: DO NOT USE PLIERS OR ANY OTHER TOOLS TO REMOVE THE CAP ASSEMBLIES. THIS CAN CAUSE DAMAGE TO THE SWITCH CAP.
(2)
Replace lamps:
(a)
Hold the cap assembly tightly on the two sides and pull the assembly out of the switch.
(b)
Turn the cap assembly to get access to the lamps.
(c)
Remove lamps from the cap assembly.
(d)
Install the replacement lamps.
(e)
Turn the cap and put the cap assembly into the switch.
(3)
Close these circuit breakers:
(a)
P18
1) GND PROX WARN
(b)
P6
1) DIM & TEST and INDICATOR LIGHTS
(4)
Supply electrical power (Ref 24-22-0).
(5)
Set the LIGHTS switch on the Pilots' center panel to the TEST position. Make sure the lamps come on.
(6)
Remove electrical power if it is not necessary (Ref 24-22-0).
500
Feb 20/91 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 34-42-21 Page 301
GPWS CONTROL MODULE - REMOVAL/INSTALLATION
1. General
A. This subject has two tasks. One is for the removal and one is for the installation of the GPWS control module. These tasks have steps for the removal of the control module, the installation of the replacement control module, and a test of the control module panel lights.
B. The GPWS control module is installed on the first officer's instrument panel, P3.
2. GPWS Control Module Removal
A. Procedure
(1)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a)
P6 Main Power Distribution Panel
1) DIM & TEST INDICATOR LIGHTS
(b)
P18 Overhead Circuit Breaker Panel
1) GND PROX WARN
(2)
Remove the GPWS control module.
(a)
Loosen the fasteners on the control module.
(b)
Pull the control module out from the instrument panel until you can get to the electrical connector.
(c)
Disconnect the electrical connector from the control module.
3. GPWS Control Module Installation
A. References
(1) 24-22-0, Manual Control (Apply Power)
B. Procedure
(1)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
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