(e)  
Make sure that the scale shows 9 to 11 pounds.

 1)  If the scale does not show the correct value, replace the wiper arm (AMM 30-42-02/401).

 (f)  
Remove the scale from the wiper arm.

 S 426-011
 (8)  
Do this task: "Wiper Blade Installation" (AMM 30-42-01/401).

 S 716-012

 (9)  
Make sure that the wiper operates:

 CAUTION: MAKE SURE TO APPLY WATER TO THE WINDSHIELD BEFORE YOU
_______ OPERATE THE WIPERS. OPERATION OF THE WIPERS WITHOUT WATER CAN CAUSE DAMAGE TO THE WINDSHIELD.
 (a)  
Apply water to the windshield.

 (b)  
Close 7E1, WSHLD WIPER L or 7E25, WSHLD WIPER R circuit breaker on the P7, Overhead Circuit Breaker Panel.

 (c)  
Make sure that the wiper operates at low speed.

 (d)  
Set the windshield wiper switch to OFF.

 (e)  
Make sure that the wiper blade moves to the parked position.

 S 866-013
 (10) Close these circuit breakers:
 (a)  
P6, Main Power Distribution Panel
 1) 6B34, WINDOW HEAT 1L PWR
 2) 6B17, WINDOW HEAT 1R PWR

 (b)  
P180, DC Power Distribution Panel
 1) 180H26, WDO HEAT CONT 1L
 2) 180H12, WDO HEAT CONT 1R

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747-400 MAINTENANCE MANUAL
 S 866-014
 (11) Remove electrical power (AMM 24-22-00/201).
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747-400 MAINTENANCE MANUAL
 MOTOR-CONVERTER - REMOVAL/INSTALLATION
______________________________________
 1.  General_______
 A.  This subject has two tasks, one for removal and one for installation of the windshield wiper motor-converter. In this procedure, you will remove the wiper arm, remove the motor-converter, and install a replacement unit. The procedure is the same for the left or right motor-converter.
 B.  The windshield wiper motor-converter is on an integral access plate located at the flight compartment No. 1 window. The access plate fits into an opening in the airplane skin. You will remove the motor-converter assembly from outside the airplane.
 TASK 30-42-03-004-017
 2.  Motor-Converter Removal (Fig. 401)_______________________
 A.  Standard Tools and Equipment
 (1)  Sealant cutting tool - hardwood or plexiglass
 B.  References
 (1)  
SSM 30-42-01

 (2)  
WDM 30-42-11

 C.  Access
 (1)  Location Zone 221 Control Cabin, LH - Outside No. 1 Left Window 222 Control Cabin, RH - Outside No. 2 Right Window
 D.  Procedure
 S 864-018
 WARNING:_______MAKE SURE TO OPEN THE CIRCUIT BREAKERS IN THIS STEP. YOU CAN GET AN ELECTRICAL SHOCK IF YOU TOUCH THE WINDSHIELD WHEN THE WINDOW HEAT POWER IS ON.
 (1)  Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  
P7, Overhead Circuit Breaker Panel
 1) 7E1, WSHLD WIPER L
 2) 7E25, WSHLD WIPER R

 (b)  
P6, Main Power Distribution Panel
 1) 6B34, WINDOW HEAT 1L PWR
 2) 6B17, WINDOW HEAT 1R PWR

 (c)  
P180, DC Power Distribution Panel
 1) 180H26, WDO HEAT CONT 1L
 2) 180H12, WDO HEAT CONT 1R

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