(d)
Check that all window indicating lights are off, the window heat control switches are in the OFF position, and that the No. 2 sliding windows are closed and the handles latched.
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30-41-0 Page 502 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. May 15/67
(3) Test Window No. 1 and 2 Heat Control
(a)
Momentarily actuate light test switch located on P2 center instrument panel to TEST position and check that window PWR ON, window OVERHEAT, and master caution ANTI-ICE indicating lights come on while switch is held in TEST position.
NOTE: This test verifies integrity of indicating lights (bulbs, sockets, wiring, etc.).
(b)
Connect voltmeter across left window No. 1 bus terminals to determine when voltage is applied to window.
(c)
Position left window No. 1 control switch to ON and check that left No. 1 window PWR ON light comes on and that voltage is applied to window.
NOTE: Window PWR ON light will not come on immediately because power to windows is applied gradually by controller. Allow up to 15 seconds for light to come on after closing control switch. On warm days under solar heating or from previous use of window heat, window temperature may be above temperature control point, preventing controller from applying heat. Under these conditions, controller may be forced to momentarily apply heat and turn on PWR ON light by actuating window heat control test switch to PWR position. If operational confidence check is performed under conditions where window temperature is within overheat cutoff range, whether by outside environment or by excessively long testing, an overheat cutoff will occur.
(d)
Momentarily actuate window heat control test switch to OVERHEAT position and check that window OVERHEAT, MASTER CAUTION and ANTI-ICE warning lights come on, window PWR ON light goes off in less than 70 seconds, and no voltage is applied to window.
(e)
Momentarily press either pilot's or first officer's master caution warning light to reset master caution circuit and check that master caution and anti-ice warning lights go off.
(f)
Momentarily press anti-ice master caution warning light and check that master caution and anti-ice warning lights come on.
(g)
Position left window No. 1 control switch momentarily to OFF and then back to ON, and check that window OVERHEAT, MASTER CAUTION and ANTI-ICE warning lights go off, left No. 1 window PWR ON light comes on and that voltage is applied to window.
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Jun 20/91 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 30-41-0 Page 503
CAUTION: THE WINDOW HEAT CONTROL SWITCH MUST BE ON FOR AT LEAST 5 MINUTES BEFORE YOU SET THE TEST SWITCH TO THE PWR POSITION. IF YOU SET THE TEST SWITCH TO PWR BEFORE THE WINDOW IS AT FULL OPERATING TEMPERATURE, YOU CAN CAUSE DAMAGE TO THE WINDOW.
NOTE: Master Caution and Anti-ice annunciator warning lights will not go off if Pitot Heat OFF Amber light is on.
Allow at least 4 minutes before proceeding to next step.
(h) Hold window heat control test switch in the PWR position and check that voltage applied to window corresponds to voltage shown in Fig. 501.
CAUTION: RELEASE TEST SWITCH AS SOON AS THE OVERHEAT LIGHT ILLUMINATES.
NOTE: If control switch has been left in OFF position for more than 5 seconds, power will be applied gradually from approximately zero volts to full voltage in a maximum of 3 minutes. If control switch has been left off for less than 5 seconds, ramp time will be adjusted proportionally to time off. If overheat cutoff occurs before required voltage is obtained, release test switch, allow window to cool, and repeat steps (g) and (h).
(i)
Release heat control test switch, allow window voltage to stabilize, and check that window temperature is maintained at 107 + 7/-7°F. Take temperature reading on outside of panel directly over heat sensing element.
(j)
Return left window No. 1 control switch to OFF and remove voltmeter installed in step (3)(b).
(k)
Repeat steps (3)(b) thru (3)(j) for remaining three heat-modulated windows using corresponding control switch and indicating lights.
(4) Restore Airplane to Normal Configuration
(a)
Close circuit breakers opened in step (2)(c).
(b)
Remove electrical power if no longer required.
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30-41-0 Page 504 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Jun 20/91
F88356
525 Control Unit Output and Window Resistance Table Jun 20/91 Figure 501 30-41-0 Page 504A/504B BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
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