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 B.  The pitot-static and temperature probe anti-icing system de-ices the left and right pitot tubes, the elevator feel left and right pitot tubes, and the temperature probe. The sensors are heated by electrical resistance elements installed within the sensing head of the units.
 C.  The alpha vane sensors are de-iced by electrical resistance elements installed within the sensor weathervane.
 D.  The toilet drain anti-icing system de-ices the fore and aft toilet drain connectors. The toilet drain connectors are heated by electrical resistance elements installed as an integral part of the connector gasket. The heaters are controlled directly by respective circuit breakers and heated whenever the airplane has electrical power.
Rain Removal Systems
____________________
 A.  The windshield wiper system maintains clear areas on the No. 1 control cabin windows during takeoff, approach, and landing in rain or snow. The wipers are driven independently by electric motors which are controlled by a common switch.
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A 737-300/400/500MAINTENANCE MANUAL

Ice and Rain Protection Systems
Figure 1

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737-300/400/500MAINTENANCE MANUAL
 B.  The rain repellent system sprays a rain repellent solution on the No. 1 control cabin windows and is used in conjunction with the windshield wiper system to improve visibility during heavy rain. The repellent solution for both windows is supplied from a common pressurized container, but is controlled independently by separate control switches for each window.
 C.  The rain repellent system consists of a hydrophobic coating applied to the number 1 window. No pilot actions are necessary to operate the system.
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737-300/400/500MAINTENANCE MANUAL
 COMBINED WINDOW AND PITOT HEAT MODULE (P5-9) - REMOVAL/INSTALLATION
___________________________________________________________________
 1.  General
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 A.  The P5-9 Module is on the pilots' overhead panel. It contains the lights and switches used by the Pitot-Static and Temperature Probe Anti-Icing System. It also contains the lights and switches used by the Control Cabin Window Anti-Icing System.
 B.  This procedure contains two tasks:
 (1)  
The removal of the P5-9 Module

 (2)  
The installation of the P5-9 Module.

 TASK 30-09-11-004-001
 2.  P5-9 Module Removal
___________________
 A.  Procedure
 S 864-002
 (1)  Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  
On the P6 panel 1) MSTR CAUTION - ANTI-ICE 2) PITOT STATIC INDICATION - F/O 3) PITOT STATIC INDICATION - CAPT 4) R FRONT WINDOW ANTI-ICE 5) L FRONT WINDOW ANTI-ICE 6) R SIDE WINDOW ANTI-ICE 7) L SIDE WINDOW ANTI-ICE 8) RIGHT NO. 4 AND NO. 5 WINDOW ANTI-ICE 9) LEFT NO. 4 AND NO. 5 WINDOW ANTI-ICE

 (b)  
On the P18 panel:

 1)  Below HEATERS - PITOT STATIC a) CAPT - UPPER L b) CAPT - LWR R c) F/O UPPER R d) F/O LWR L e) ELEVATOR PITOT - R f) ELEVATOR PITOT - L
 2) TEMP PROBE
 3) ALPHA VANE HTR - R
 4) ALPHA VANE HTR - L

 (c)  Below WINDOW HEAT CONTROL
 1) RIGHT FRONT AC
 2) RIGHT SIDE AC
 3) LEFT FRONT AC
 4) LEFT SIDE AC

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