NOTE: Each light will go on when pressed and off when released.
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(2) Test Wing TAI System
(a)
Position left engine bleed valve to open and isolation valve to closed.
(b)
Place wing TAI control switch in ON position and check that both valve open lights glow brightly for 1 to 3 seconds and then continue to glow dim.
(c)
Increase left engine power slightly until both valve open lights glow brightly (left ground overheat switch actuates).
(d)
Reduce left engine power to idle, close left engine bleed valve and check that the valve open lights return to dim after a short interval.
(e)
Repeat steps (a), (c), and (d) for right side of system to check operation of right ground overheat switch.
(f)
Place wing TAI control switch in OFF position and check that both valve open lights glow brightly for 1 to 3 seconds and then go off.
(g)
Shut down engine.
E. Ground Operational Test with APU Power (alternative to test with Engine Power).
(1)
Provide electrical power (Ref Chapter 24, Electrical Power).
(2)
Start the APU (Ref Chapter 49, APU) and allow it to stabilize.
(3)
Make sure the VALVE OPEN indicator lights operate:
(a)
Push the L and R VALVE OPEN lights on the P5 overhead panel.
(b)
Make sure that each light comes on.
(c)
Release the VALVE OPEN lights.
(d)
Make sure that each light goes off.
(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.
(5)
Do this test of the left wing TAI system:
(a)
Disconnect electrical connector D736 from the right wing ground thermal 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.
(c)
Set the APU BLEED switch to ON.
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.
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.
1) Make sure that both VALVE OPEN lights become 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.
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(e) Connect the electrical connector to the right wing ground thermal switch.
(6) Do a test of the right wing TAI system:
(a)
Disconnect electrical connector D738 from the left wing ground thermal switch.
(b)
Set the APU BLEED switch to ON.
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.
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 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.
(7) Remove electrical power (Ref Chapter 24, Electrical Power).
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WING THERMAL ANTI-ICING SHUTOFF VALVE - REMOVAL AND INSTALLATION
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