NOTE: It is possible that the lights will not become
____ dim for up to 2 minutes after you set the APU BLEED switch to OFF.
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737-300/400/500MAINTENANCE MANUAL
 (e)  Connect the electrical connector to the right wing ground thermal test switch.
 S 715-042
 (6)  Do this test of the right wing TAI system:
 (a)  Disconnect electrical connector D738 from the left wing ground thermal test switch.
 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.
 (b)  
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.

 (c)  
Set the APU BLEED switch to OFF. 1) Make sure that each VALVE OPEN light becomes dim.

 NOTE: It is possible that the lights will not become
____ dim for up to 2 minutes after you set the APU BLEED switch to OFF.
 (d)  
Connect the electrical connector to the left wing ground thermal test switch.

 (e)  
Set the WING ANTI-ICE switch to OFF. 1) Make sure that each VALVE OPEN light comes on bright for 1 to 3 seconds.

 2)  Make sure that each VALVE OPEN light becomes dim after 3 seconds.
 S 865-043
 (7)  
Do a shutdown of the APU (AMM 49-11-00/201).

 (8)  
Remove electrical power (AMM 24-22-00/201).

 S 865-041
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A 737-300/400/500MAINTENANCE MANUAL
 TASK 30-11-00-705-003
 3.  Wing TAI System Functional Test_______________________________
 A. Special Tools and Equipment
 (1)  Temp-Cal Probe Heater BH 3884-40 (attachment to Jet-Cal engine analyzer) or H294 Temp-Cal Thermal Switch Tester or H394 Temp-Cal Tester with adapter cable BH405
 BH24944 Heater Probe Kit (basic P/N)
 NOTE: This kit is necessary to use the
____ testers listed above. There are different dash number kits for specific airplane model and tester combinations. Please consult with supplier.
 Howell Instruments 3479 West Vickery Blvd. Fort Worth, Texas 76107
 B. References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 12-30-00/201, Wing Lower Surface Access Panels

 (3)  
AMM 30-11-21/401, Wing Anti-Ice Ground Overheat Thermal Switch

 C. Access
 (1)  
Location Zone
 101 Control Cabin - Left
 507 Left Nacelle - Strut
 607 Right Nacelle - Strut

 (2)  
Access Panel
 5727L Access Door Strut
 5827R Access Door Strut
 6307L Slat Access Panel Removable
 6407L Slat Access Panel Removable

 D. Prepare for the test.
 S 865-004
 (1)  
Supply electrical power (24-22-00/201).

 S 865-005

 (2)  
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

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