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WING THERMAL ANTI-ICING SYSTEM - ADJUSTMENT/TEST
EFFECTIVITY
Airplanes with Wing TAI System Ground Operation Capability
1.  Wing Thermal Anti-Icing System Test
A.  General
(1)  Testing of the wing TAI system is separated into three parts; an electrical control and indicating system test, a duct pressure and leakage test, and a ground test.
(a)  
The electrical control test is effective in establishing correct functioning of the electrical control components, circuit continuity, and valve motor operation.

(b)  
The duct leakage test is effective in establishing that all joints are properly made and that allowable leakage is distributed throughout the system. Leakage should not be present in any localized area to an extent capable of creating operating pressure or temperature hazards.

(c)  
The ground test is effective as a system confidence check. The test is accomplished with either the engines or the APU running. All functions are performed in the control cabin and requires no access to ducts or system components.

B.  Electrical Control and Indicating System Test
(1)  Equipment and Materials
(a)  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
(2)  Prepare to Test Control and Indicating System
(a)  
Connect external power and energize 115 volts ac transfer buses No. 1 and 2, and 28v dc T/R bus No. 1.

(b)  
Check that the following circuit breakers on P6 and P18 circuit breaker panels are closed: 1) ENG 1 & WING ANTI-ICE CONT (C148) 2) WING ANTI-ICE (C146) 3) LANDING GEAR LIGHTS (C404)

Aug 01/96 30-11-01 Page 501
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

(c)  
On pilot's overhead panel (P5) press to test wing anti-ice left and right valve open lights for operation.

NOTE: Each light will come on when pressed and go off when released.

(d)  
Check that both throttle levers are in idle position.

(3)  
Test Valve Control Circuit

(a)  
Place wing TAI control switch in ON position. Check that left and right valve open lights glow brightly for 1 to 3 seconds and then continue to glow dim and left and right wing anti-ice valves open.

(b)  
Disconnect electrical connector from left wing anti-ice valve. Check that left valve open light glows bright continuously.

(c)  
Connect electrical connector to left wing anti-ice valve. Check that left valve open light glows dim continuously.

(d)  
Repeat steps (b) and (c) for right wing anti-ice valve. Results should be the same for right valve open light.

(e)  
Place wing anti-ice switch in OFF position. Check that left and right valve open lights glow brightly for 1 to 3 seconds and then go off and left and right wing anti-ice valves close.

(4)  
Test Thermal Switch

(a)  
Place wing anti-ice switch in ON position. Check that left and right valve open lights glow brightly for one to three seconds and then continue to glow dim and left and right wing anti-ice valves open.

(b)  
Remove thermal switch from left wing TAI manifold (Ref 30-11-21 R/I). Connect electrical connector to thermal switch.

(c)  
Place WING ANTI-ICE control switch in ON position. After both valve open lights dim indicating both valves open, heat thermal switch to 125 +10/-0°C with Temp-Cal heater and check that both valve open lights glow bright after one to three seconds and both valves close.

(d)  
Allow thermal switch to cool to ambient temperature, then check that both valve open lights return to dim and both valves open.

(e)  
Place control switch in OFF position and install thermal switch (Ref 30-11-21 R/I).

(f)  
Repeat steps (a) thru (d) for right thermal switch.

(g)  
Remove electrical power if no longer required.

(5)  
Deleted

(6)  
Test Throttle Switch Activation

(a)  Place wing anti-ice switch in ON position. Check that left and right valve open lights glow brightly for one to three seconds and then continue to glow dim and left and right wing anti-ice valves open.
　
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