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737-300/400/500MAINTENANCE MANUAL
 (b)  Monitor the temperature of the window with a pyrometer.  Do not
 exceed 200 Degrees F / 93 Degrees C.
 (c)  Make sure the resistance is not more than 1000 ohms.
 NOTE:____ This is a check for an open sensor.  Any resistance
 more than 1000 ohms shows a defective sensor.

 (d)  Remove the plate.
 S 435-037
 (6)  
If the primary sensor is satisfactory, connect the wires to the sensor connection.

 S 765-063

 (7)  
If you find a defective primary sensor, do this check on the spare sensor.

 NOTE: Do the check for the window with the defective primary
____ sensor.
 (a)  
Measure the resistance across the spare sensor.

 1)  Make sure there is 310 +/- 20 ohms between the spare sensor terminals.

 (b)  
Connect the wires to the spare sensor connection if the sensor is satisfactory.

 S 905-017
 (8)  
If you find defective primary and spare sensors at a window, replace the window (AMM 56-11-11/401 Window No. 1, AMM 56-12-11/401 Window No. 2).

 S 415-035

 (9)  
Install the lightshield (AMM 25-11-11/201).

 S 865-064

 (10)
 Close these circuit breakers and remove the DO-NOT-CLOSE tags:

 (a)  
On the P18 panel (below the words WINDOW HEAT CONTROL), 1) RIGHT FRONT-AC 2) LEFT FRONT-AC 3) RIGHT SIDE-AC 4) LEFT SIDE-AC

 (b)  
On the P6 panel, 1) R FRONT WINDOW ANTI-ICE 2) L FRONT WINDOW ANTI-ICE 3) R SIDE WINDOW ANTI-ICE 4) L SIDE WINDOW ANTI-ICE

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737-300/400/500MAINTENANCE MANUAL
 WINDOW NO. 5 THERMAL SWITCH - REMOVAL/INSTALLATION
__________________________________________________
 1.  General
_______
 A.  This procedure contains two tasks:
 (1)
The removal of a thermal switch from a window

 (2)
The installation of a thermal switch on a window.

 B.  A thermal switch is near the bottom of the No. 5 windows. The windows have arrows and the words LOCATE SWITCH to show where to install the switch. A spring holds the thermal switch against the window (Fig. 401).
 TASK 30-41-31-004-001
 2.  Thermal Switch Removal (Fig. 401)
______________________
 A.  Access
 (1)  Location Zone
 101/102 Control Cabin

 B.  Procedure
 S 864-003
 (1) Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)
WINDOW ANTI-ICE R4 R5

 (b)
WINDOW ANTI-ICE L4 L5

 S 034-006
 (2) Remove the switch.
 (a)
Disconnect the wires from the switch.

 (b)
Pull the spring away from the switch.

 (c)
Remove the switch from the window.

 TASK 30-41-31-404-007
 3.  Thermal Switch Installation
___________________________
 A.  Special Tools and Equipment
 (1)  
Pyrometer - Alnor portable pyrometer, Type 4000A with thermocouple 4040 and thermocouple arm 4010 or model 687 DIGICON INDICATOR System (to measure the temperature of the window)

 (2)  
Infrared Measurement Instrument - WAHL IRT-50E (Preferred to the pyrometer to measure the temperature of the window)

 B.  Consumable Materials
 (1) G02175, Tape - Teflon Adhesive
 NOTE: A commercially available teflon tape
____ with a non-stick finish can be used.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
　
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