(b)
Monitor the temperature of the window with a pyrometer. Do not exceed 200 Degrees F / 93 Degrees C.
TASK 30-41-21-705-007
3. Do a Check of the Resistance of the Sensors in the No. 1 and No. 2 Windows
__________________________________________________________________________
A. Standard Tools and Equipment
(1)
Ohmmeter - 0- to 500-ohm range, accurate to | 5 percent
(2)
A square aluminum plate, 1.75 inches wide, 0.25 inch thick
B. References
(1)
AMM 25-11-11/201, Flight Compartment Equipment
(2)
AMM 56-11-11/401, Window No. 1
(3)
AMM 56-12-11/401, Window No. 2
(4)
IPC 56-11-11, 56-12-11
(5)
SSM 30-40-00, 30-41-00
(6)
WDM 30-41-11, 30-41-12
C. Access
(1) Location Zone
101 Control Cabin - Left
102 Control Cabin - Right
D. Procedure
S 865-067
(1)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a)
On the P-18 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
(2)
Remove the lightshield (AMM 25-11-11/201).
S 015-033
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737-300/400/500MAINTENANCE MANUAL
S 765-024
(3) Do a check of the resistance of the sensor in the necessary window.
(a)
Disconnect the wires from the window heat sensor.
(b)
Make sure that the resistance is in the limits shown in Fig. 502.
NOTE: If the resistance is above the limits, the window could
____ be warmer that the ambient temperature. Try cooling the window to closer to the ambient temperature and repeat the measurement.
S 715-008
(4) Do a test to make sure the sensor will not operate intermittently.
(a) Put a piece of aluminum plate in hot water to increase its temperature to approximately 200 |10°F.
CAUTION: DO NOT PUT THE PLATE ON THE WINDOW IF THE WINDOW
_______ IS VERY COLD. THE HOT PLATE CAN CAUSE DAMAGE TO THE WINDOW.
(b) Put the plate above the sensor on the external surface of the window.
S 715-076
CAUTION: MAKE SURE THE WINDOW IS NOT HEATED TO OVER 200 DEGREES F / 93
_______ DEGREES C AND IS LIMITED TO NOT MORE 10 MINUTES OF HEATING. HEATING PAST THESE LIMITS COULD DAMAGE THE WINDOW.
(5) As an optional method for heating the window temperature sensor a heat gun is acceptable.
(a) Keep the heat gun approximatley 12 inches / 30 centimeters or more from the windshield surface. Do not apply heat for longer than 10 minutes.
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A 737-300/400/500MAINTENANCE MANUAL
40 60 80 100 120 140 160
AMBIENT TEMPERATURE `F
Resistance of the Window Heat Control Sensor
Figure 502
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