S 865-007
(5)
Remove the access panels to get to the wing TAI valves.
(AMM 12-30-00/201)
E. Procedure
S 725-008
(1) Do a test of the TAI indication.
(a)
Put the WING ANTI-ICE switch in the ON position.
(b)
Make sure the L VALVE OPEN and R VALVE OPEN lights come on brightly for 1 to 3 seconds.
(c)
Make sure the L VALVE OPEN and R VALVE OPEN lights are on dimly after 3 seconds.
(d)
Make sure the wing TAI valves open.
(e)
Disconnect the D732 electrical connector from the left wing TAI valve.
(f)
Make sure the L VALVE OPEN light is on brightly and continuously.
(g)
Connect the D732 electrical connector to the left wing TAI valve.
(h)
Make sure the L VALVE OPEN light is on dimly and continuously.
(i)
Disconnect the D734 electrical connector from the right wing TAI valve.
(j)
Make sure the R VALVE OPEN light is on brightly and continuously.
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737-300/400/500MAINTENANCE MANUAL
(k)
Connect the D734 electrical connector to the right wing TAI valve.
(l)
Make sure the R VALVE OPEN light is on dimly and continuously.
(m)
Put the WING ANTI-ICE switch in the OFF position.
(n)
Make sure the L VALVE OPEN and R VALVE OPEN lights come on brightly for 1 to 3 seconds.
(o)
Make sure the L VALVE OPEN and R VALVE OPEN lights go off.
(p)
Make sure the wing TAI valves close.
S 715-009
(2) Make sure the thermal switches operate correctly.
(a)
Remove the thermal switch from the TAI duct in the left wing (AMM 30-11-21/401).
(b)
Connect the D738 electrical connector to the thermal switch.
(c)
Put the WING ANTI-ICE switch in the ON position.
(d)
Use the special tool to increase the temperature of the thermal switch until it is from 125 to 135 degrees C.
(e)
See that the L VALVE OPEN and the R VALVE OPEN lights come on brightly and continuously.
(f)
See that the TAI valves in each wing are closed.
(g)
Let the thermal switch become cool.
(h)
When the thermal switch is cool, monitor the TAI valves and lights. 1) See that the L VALVE OPEN and the R VALVE OPEN lights are
on dimly. 2) See that the TAI valve in each wing is open.
(i)
Put the WING ANTI-ICE switch in the OFF position.
(j)
Install the thermal switch in the TAI duct in the left wing (AMM 30-11-21/401).
(k)
Remove the thermal switch from the TAI duct in the right wing (AMM 30-11-21/401).
(l)
Connect the D736 electrical connector to the thermal switch.
(m)
Put the WING ANTI-ICE switch in the ON position.
(n)
Use the special tool to increase the temperature of the thermal switch until it is from 125 to 135 degrees C.
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(o) See that the L VALVE OPEN and the R VALVE OPEN lights come on
brightly and continuously.
(p) See that the TAI valves in each wing are closed.
(q) Let the thermal switch become cool.
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