on dimly. 2) See that the TAI valve in each wing is open.

 (s)  
Put the WING ANTI-ICE switch in the OFF position.

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737-300/400/500MAINTENANCE MANUAL
 (t)  
Install the thermal switch in the TAI duct in the right wing (AMM 30-11-21/401).

 (u)  
Install slat access panels (AMM 12-30-00/201).

 S 862-001
 (3)  Remove electrical power if it is not necessary (AMM 24-22-00/201).
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 WING THERMAL ANTI-ICING SYSTEM - ADJUSTMENT/TEST
________________________________________________
 1.  General_______
 A. This procedure contains three tasks:
 (1)
An operational test of the wing TAI system on the ground

 (2)
A functional test of the wing TAI system

 (3)
A functional test of the TAI ducts.

 TASK 30-11-00-705-001
 2.  Wing TAI Ground Operational Test________________________________
 A. References
 (1)
AMM 24-22-00/201, Manual Control

 (2)
AMM 49-11-00/201, APU Power Plant

 B. Access
 (1)  Location Zone
 101 Control Cabin - Left

 C. Prepare for the the test.
 S 865-021
 (1) Make sure these circuit breakers are closed:
 (a)
ANTI-ICE & RAIN - ENGINE #1 AND WING

 (b)
ANTI-ICE AND RAIN - WING VALVE

 (c)
AIR/GND RELAY & LIGHTS

 (d)
NOSE GEAR AIR/GND

 D. Wing TAI Ground Operational Test with APU Power
 S 865-037
 (1)
Supply electrical power (AMM 24-22-00/201).

 (2)
Start the APU (AMM 49-11-00/201).

 S 715-038

 (3)
Make sure that the VALVE OPEN indicator lights operate:

 S 865-036
 (a) Push the L and R VALVE OPEN lights (P5 overhead panel).
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737-300/400/500MAINTENANCE MANUAL
 (b)  
Make sure that each light comes on.

 (c)  
Release the VALVE OPEN lights.

 (d)  
Make sure that each light goes off.

 S 865-039
 (4)  Prepare for the test:
 (a)  
Set the BLEED 1 and 2 switches on the P5 panel to OFF.

 (b)  
Set the PACK L and R switches on the P5 panel to OFF.

 (c)  
Set the ISOLATION VALVE switch on the P5 panel to OPEN.

 S 715-040
 (5)  Do this test of the left wing TAI system:
 (a)  
Disconnect electrical connector D736 from the right wing ground thermal test switch.

 (b)  
Set the WING ANTI-ICE switch to ON. 1) Make sure that each VALVE OPEN light comes on bright for 1 to 3 seconds (this shows that the valves are in transit).

 2)  Make sure that each VALVE OPEN light becomes dim after 3 seconds.
 CAUTION: DO NOT LET THE WING TAI VALVE BE OPEN FOR MORE THAN 30
_______ SECONDS. OPERATION FOR MORE THAN 30 SECONDS WITH HEATED AIR CAN CAUSE DAMAGE TO THE WING LEADING EDGE.
 (c)  
Set the APU BLEED switch to ON. 1) Make sure that each VALVE OPEN light comes on bright in approximately 10 to 30 seconds.

 2)  If the lights do not come on in 30 seconds, set the APU BLEED switch to OFF.

 (d)  
Set the APU BLEED switch to OFF.
　
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