(d)
Open the ENGINE EPR circuit breakers on the P6 panel.
(e)
Fully advance No. 1 throttle. Check that both left and right wing anti-ice valves close and both left and right valve open lights glow brightly continuously.
(f)
Retard No. 1 throttle to idle stop position. Check that both left and right wing anti-ice valves open and both left and right valve open lights dim after 1 to 3 seconds.
(g)
Repeat steps (d) and (e) for No. 2 throttle. Results should be the same.
(h)
Close the ENGINE EPR circuit breakers on the P6 panel.
(i)
Open LANDING GEAR LIGHTS circuit breaker. Check that wing anti-ice switch automatically moves to OFF position and left and right wing anti-ice valves close.
(j)
Fully advance No. 1 throttle and place wing anti-ice switch in ON position. Check that left and right wing anti-ice valves open.
(k)
Retard No. 1 throttle and place wing anti-ice switch in OFF position. Check that left and right wing anti-ice valves close.
501
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PITOT STATIC TUBES AND TEMPERATURE PROBE ANTI-ICING SYSTEM - DESCRIPTION AND
OPERATION
1. General
A. The left and right pitot static tubes, the elevator feel left and right pitot tubes, and the temperature probes are heated to prevent the formation of ice, which could affect sensing accuracy (Fig. 1). The heating is accomplished by electrical heaters installed as an integral part of the units. The heaters consist of resistance elements, which operate on 115-volt ac.
B. The heaters are controlled by two switches on the P5-9 module in the overhead panel. The control switches are four-pole two-position (ON-OFF) toggle switches. The system has an indicating circuit consisting of a current transformer, an electronic switch, and an indicating light for each sensor. The electronic switches and indicating light circuits are installed on printed cards. The transformer is installed in the line to the heater.
C. One switch controls the heating of the upper and lower left pitot static heater, left temperature probe heater, and the left elevator feel pitot heater. The other switch controls the heating of the upper and lower right pitot static heaters, and the right elevator feel pitot heater and right temperature probe heater. When the transformer does not sense current flow, the electronic switch provides a ground for the indicating light.
D. The light circuits receive 28-volt dc power through the master dim relay from the INDICATOR DIM BUS NO. 1 DC and NO. 2 DC circuit breakers on the P6 panel. The lights are of the press-to-test type and may be tested individually or through the use of the master light test switch. The lights may also be dimmed through the use of the master dim switch (Ref Chapter 33, Master Warning and Caution Lights).
E. The P5-9 module located in the pilots' P5 overhead panel contains the control switches, indicating lights, transformers, and printed circuit cards. The P5-9 module also contains the switches and indicating lights for the control cabin window anti-icing system.
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F88106 T53013
Pitot-Static Tubes and Temperature Probe Anti-Icing Equipment Location 580
30-31-0 Figure 1 Jan 20/82
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580 Pitot-Static Probe and Temperature Probe Anti-Icing System Circuit
Sep 20/81 Figure 2 30-31-0
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PITOT-STATIC AND TEMPERATURE PROBE ANTI-ICING SYSTEM - TROUBLE SHOOTING
1. General
A. Before using the following trouble shooting chart, prepare to test the pitot static and temperature probe in accordance with adjustment test procedure. Proceed with test to extent practical to determine extent of trouble.
2. Trouble Shooting Chart
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PITOT STATIC AND TEMPERATURE PROBE ANTI-ICING SYSTEM - MAINTENANCE PRACTICES
1. General
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