737-300 400 500 AMM 飞机维护手册 防冰和排雨(49)

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 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, temperature probe heater, left alpha vane heater, and the left elevator feel pitot heater. The other switch controls the heating of the upper and lower right pitot-static heaters, right alpha vane heater and the right elevator feel pitot 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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A 737-300/400/500MAINTENANCE MANUAL

CAPT P/S 1 AUX STATIC A 
2 AUX P/S F/O STATIC A 
A PITOT L ELEV 
VANE L ALPHA 
A PROBE TEMP 

PITOT STATIC
AB

OFF
ON
HEAT

2 AUX STATIC F/O P/S A 
CAPT STATIC 1 AUX P/SA 
R ELEV A PITOT 
A VANE R ALPHA 

Pitot-Static Tubes, Temperature Probe and Alpha Vane
Anti-Icing Equipment Location
Figure 1

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A 737-300/400/500MAINTENANCE MANUAL

P5-9 MODULE - WINDOW AND PITOT HEAT
Pitot-Static Tubes, Temperature Probe and Alpha Vane
Anti-Icing System Circuit (System A)
Figure 2 (Sheet 1)

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A 737-300/400/500MAINTENANCE MANUAL

P5-9 MODULE - WINDOW AND PITOT HEAT
Pitot-Static Tubes, Temperature Probe and Alpha Vane
Anti-Icing System Circuit (System B)
Figure 2 (Sheet 2)

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A
737-300/400/500MAINTENANCE MANUAL
 PITOT-STATIC TUBES, TEMPERATURE PROBE, AND ALPHA VANE
_____________________________________________________ ANTI-ICING STSTEM - 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.
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