S 424-006
(2)
Install the window heat control unit on the shelf
(AMM 20-10-07/201).
S 864-007
(3)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a)
P6 Panel
1) WINDOW ANTI-ICE L FRONT
2) WINDOW ANTI-ICE R FRONT
3) WINDOW ANTI-ICE L SIDE
4) WINDOW ANTI-ICE R SIDE
(b)
P18 Panel 1) WINDOW HEAT CONTROL LEFT FRONT AC 2) WINDOW HEAT CONTROL LEFT SIDE AC 3) WINDOW HEAT CONTROL RIGHT FRONT AC 4) WINDOW HEAT CONTROL RIGHT SIDE AC
(4)
Do this task: "Window Heat Control Unit Test" (AMM 30-41-11/501).
S 714-008
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A
737-300/400/500MAINTENANCE MANUAL
WINDOW HEAT CONTROL UNIT - ADJUSTMENT/TEST
__________________________________________
1. General_______
A. This task is an operational test of the window heat control unit (WHCU). Do this task after you replace a WHCU.
TASK 30-41-11-715-007
2. Operational Test - Window Heat Control Unit___________________________________________
A. References
(1) AMM 24-22-00/201, Manual Control
B. Access
(1) Location Zone
101, 102 Control Cabin
C. Procedure
S 865-005
(1)
Supply electrical power (AMM 24-22-00/201).
S 865-001
(2)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a) P6 Panel 1) 28 VDC PITOT STATIC INDICATION - CAPT 2) 28 VDC PITOT STATIC INDICATION - F/O
S 715-002
(3) Make sure that the window heat indicator light operates:
(a)
Push the applicable window heat ON light on the WINDOW HEAT CONTROL MODULE.
(b)
Make sure that the ON light comes on.
(c)
Release the ON light.
S 715-003
(4) Do this test of the window heat control unit:
(a) Set the applicable window heat control switch to ON. 1) Make sure that the window heat ON light comes on within 15 seconds.
2) Make sure that the temperature of the applicable window increases.
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737-300/400/500MAINTENANCE MANUAL
(b)
Push either MASTER CAUTION light. 1) Make sure that the MASTER CAUTION lights stay off. 2) Make sure that the ANTI-ICE annunciator light on the
glareshield stays off.
(c)
Set the applicable window heat TEST switch to OVHT for 1 second and then release the switch. 1) Make sure that the OVERHEAT light, the two MASTER CAUTION
lights, and the ANTI-ICE light come on. 2) Make sure that the window heat ON light goes off in less than 70 seconds after the OVERHEAT light comes on.
(d)
Set the applicable window heat control switch to OFF for 1 second and then back to ON. 1) Make sure that the OVERHEAT light light goes off. 2) Press either MASTER CAUTION light. 3) Make sure that the MASTER CAUTION light and the ANTI-ICE
light goes off. 4) Make sure that the window heat ON light comes on.
(e)
After 4 minutes, hold the window heat TEST switch to PWR. 1) Make sure that the window heat ON light stays on.
NOTE: If the window reaches its upper safe temperature
____ limit, the OVERHEAT light, the MASTER CAUTION lights, and the ANTI-ICE light will come on. If the test switch is held to PWR after the OVERHEAT light comes on, the ON light will go off within 70 seconds.
2) Release the window heat TEST switch.
(f) Set the window heat control switch to OFF.
1) Make sure that the OVERHEAT light, the two MASTER CAUTION lights, and the ANTI-ICE light are off.
S 865-004
(5) Close these circuit breakers and remove the DO-NOT-CLOSE tags:
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