CAUTION: YOU MUST DO THE STEPS IN THE SPECIFIED PROCEDURE WHEN YOU MOVE THE WINDOW HEAT CONTROL UNIT. STATIC DISCHARGE CAN CAUSE DAMAGE TO THE WINDOW HEAT CONTROL UNIT.
(2)
Install the window heat control unit on the shelf.
(3)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a)
P6 Panel
1) WINDOW ANTI-ICE FRONT
2) WINDOW ANTI-ICE R FRONT
3) WINDOW ANTI-ICE L SIDE
4) WINDOW ANTI-ICE R SIDE
(b)
P18 Panel 1) WINDOW HEAT CONTROL LEFT FRONT AC 2) WINDOW HEAT CONTROL LEFT SIDE AC 3) WINDOW HEAT CONTROL RIGHT FRONT AC 4) WINDOW HEAT CONTROL RIGHT SIDE AC 5) WINDOW HEAT CONTROL LEFT FRONT DC 6) WINDOW HEAT CONTROL LEFT SIDE DC 7) WINDOW HEAT CONTROL RIGHT FRONT DC 8) WINDOW HEAT CONTROL RIGHT SIDE DC
(4)
Do the window heat control unit test (Ref 30-41-11/501).
500
Aug 01/95 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 30-41-11 Page 403
WINDOW HEAT CONTROL UNIT - ADJUSTMENT/TEST
1. General
A. After replacement of a window heat control unit, test the window heat and indicator light circuits for that control unit.
2. Window Heat Control Unit Test
A. Connect electrical power and energize appropriate buses furnishing power to the window and indicating lights controlled by replaced window heat control unit.
B. Check that appropriate circuit breakers for replaced window heat control unit on 28-volt dc bus, 115-volt ac bus, and 115-volt ac generator bus are closed. Also check that appropriate circuit breakers for indicator lights are closed.
C. Check indicator lights for window controlled by replaced window heat control unit (push-to-test).
D. Position appropriate window heat control switch to ON. Check that corresponding window temperature is increasing and the POWER ON indicator light illuminates.
E. Depress either master caution lights and observe that both master caution lights and anti-ice annunciator lights are off.
F. Momentarily turn the window heat control test switch to the OVHT position. Check that the overheat light, the two master caution lights and the anti-ice annunciator light illuminate and power on light extinguishes in less than 70 seconds.
G. Momentarily set the window heat control switch to OFF and back to ON. The window OVERHEAT light and the ANTI-ICE annunciator light shall extinguish, the POWER ON light shall illuminate. If all other master caution annunciator lights are extinguished, the two master caution lights shall also extinguish.
H. Position window test switch to PWR. Check that respective window temperature increases and if temperature is allowed to rise to upper safe temperature limits, that OVERHEAT light, the two MASTER CAUTION lights and the ANTI-ICE annunciator light illuminates and the POWER ON light extinguishes in less than 70 seconds, or extinguishes immediately, depending on which window heat control unit is installed.
CAUTION: RELEASE TEST SWITCH AS SOON AS THE OVERHEAT LIGHT
ILLUMINATES.
I. Return window control switch to OFF. All lights shall extinguish.
J. Determine if there is any further need for electrical power on airplane. If not, remove electrical power.
500
Oct 20/86 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 30-41-11 Page 501
WINDOW HEAT CONDUCTIVE COATING AND SENSOR - ADJUSTMENT/TEST
1. Window Heat Conductive Coating and Sensor Test
A. General
(1)
The control cabin window test consists of three separate tests, a window No. 1 and 2 conductive coating resistance test, a window No. 1 and 2 sensor resistance test and a window No. 4 and 5 conductive coating resistance test. The conductive coating resistance tests are effective in establishing that the power dissipation of the windows is within acceptable limits. The sensor resistance test is effective in checking the window sensor for shorts, open circuits, and that the sensor resistance is within acceptable control limits.
(2)
Refer to Chapter 56, for access to window bus terminals and window replacement.
B. Windows No. 1 and 2 Conductive Coating Resistance Test
(1)
General
(a) Windows No. 1 and 2 have a code number etched on the inner pane adjacent to one of the bus terminals, which designates the window resistance when new. The resistance of the conductive coating increases slightly with age. If the resistance differs widely enough from that indicated by the window marking, the window power lead should be connected to a different control unit output terminal, as required to maintain the correct heating current. See figure 501 for correct terminal number for windows No. 1 and 2 resistances. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：737 AMM 飞机维护手册 防冰和排雨 ICE AND RAIN PROTECTION(27)
