(2)  
Access Panel
 5727L Access Door Strut
 5827R Access Door Strut
 6241L Slat Access Panel Removable
 6541R Slat Access Panel Removable

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 E. Procedure
 S 865-028
 (1)  
Supply electrical power (Ref 24-22-00/201).

 S 865-029

 (2)  
Make sure these circuit breakers are closed:

 (a)  
On the P18-3 panel - Load Control Center, Left 1) WING ANTI-ICE VALVE 2) ANTI-ICE CONTROL ENG 1 & WING

 (b)  
On the P6-3 panel - Load Control Center, Right 1) LANDING GEAR AIR/GND RELAY & LIGHTS 2) NOSE GEAR AIR/GND

 S 725-030
 (3)
Push each light on the P5-11 module to make sure it comes on.

 S 725-031

 (4)  
Do these steps to see that the thermal switches make the module operate correctly:

 (a)  
Put the WING ANTI-ICE switch in the on position.

 (b)  
Disconnect electrical connector D738 from the left thermal switch.

 (c)  
Temporarily connect a wire between pins 1 and 2 of electrical connector D738.

 (d)  
Make sure that the L VALVE OPEN and R VALVE OPEN lights are on brightly.

 (e)  
Remove the wire between pins 1 and 2 on electrical connector D738.

 (f)  
Make sure that L VALVE OPEN and R VALVE OPEN lights are on dimly.

 (g)  
Connect electrical connector D738 to the left thermal switch.

 (h)  
Disconnect electrical connector D736 from the right thermal switch.

 (i)  
Temporarily connect a wire between pins 1 and 2 of electrical connector D736.

 (j)  
Make sure the L VALVE OPEN and R VALVE OPEN lights are on brightly.

 (k)  
Remove the wire from between pins 1 and 2 of electrical connector D736.

 (l)  
Make sure the L VALVE OPEN and R VALVE OPEN lights are on dimly.

 (m)  
Connect electrical connector D736 to the right thermal switch.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 30-11-41
 ALL  ú ú 03 Page 506 ú Nov 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 865-032
 (5)  
Open the LANDING GEAR AIR/GND RELAY & LIGHTS circuit breaker on the P6 panel.

 S 725-033

 (6)  
Do these steps to see that the module operates correctly in flight:

 (a)  
Make sure the WING ANTI-ICE switch goes to the OFF position automatically.

 (b)  
Make sure the L VALVE OPEN and R VALVE OPEN lights come on brightly and then go off.

 (c)  
Put the WING ANTI-ICE switch in the on position.

 (d)  
Make sure the L VALVE OPEN and R VALVE OPEN lights come on brightly for 1 to 3 seconds.

 (e)  
Make sure the L VALVE OPEN and R VALVE OPEN lights are on dimly after 3 seconds.

 (f)  
Disconnect electrical connector D3200 from the low flow solenoid in the left engine strut.

 (g)  
Make sure there is no DC voltage between pins 1 and 2 of electrical connector D3200.

 S 865-034
 (7)  
Close the LANDING GEAR AIR/GND RELAY & LIGHTS circuit breaker on the P6 panel.

 S 725-035

 (8)  
Continue the test.

 (a)  
Make sure there is 28 volts DC between pins 1 and 2 of electrical connector D3200.

 (b)  
Disconnect electrical connector D3202 from the low flow solenoid in the right engine strut.

 (c)  
Make sure there is 28 volts DC between pins 1 and 2 of electrical connector D3202.

 S 865-036
 (9)  
Open the NOSE GEAR AIR/GND circuit breaker on the P6 panel.