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747-400 MAINTENANCE MANUAL
 S 715-004
 (3)  Make sure the left windshield wiper operates:
 (a)  Set the left windshield WIPER switch to LO. 1) Make sure that the wiper blade operates at 171 to 209
 strokes per minute. 2) Make sure that the wiper blade moves freely and smoothly. 3) Make sure that the wiper blade does not contact the
 windshield seal.
 (b)  Set the left windshield WIPER switch to HI. 1) Make sure that the wiper blade operates at 225 to 275
 strokes per minute. 2) Make sure that the wiper blade moves freely and smoothly. 3) Make sure that the wiper blade does not contact the
 windshield seal.
 (c)  Set the left windshield WIPER switch to OFF.
 CAUTION: MAKE SURE THAT THE WIPER BLADE IS PARALLEL TO THE
_______ WIPER ARM WHEN IT PARKS. IF THE WIPER BLADE IS NOT PARALLEL, IT CAN LIFT AWAY FROM THE WINDSHIELD IN FLIGHT.
 1)  Make sure that the wiper blade moves to the park position off the windshield glass and against the stop.
 NOTE: The blade should turn and align with the wiper arm.
____
 S 715-005
 (4)  Make sure the right windshield wiper operates:
 (a)  Set the right windshield WIPER switch to LO. 1) Make sure that the wiper blade operates at 171 to 209
 strokes per minute. 2) Make sure that the wiper blade moves freely and smoothly. 3) Make sure that the wiper blade does not contact the
 windshield seal.
 (b)  Set the right windshield WIPER switch to HI. 1) Make sure that the wiper blade operates at 225 to 275
 strokes per minute. 2) Make sure that the wiper blade moves freely and smoothly. 3) Make sure that the wiper blade does not contact the
 windshield seal.
 (c)  Set the right windshield WIPER switch to OFF.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 CAUTION: MAKE SURE THAT THE WIPER BLADE IS PARALLEL TO THE
_______ WIPER ARM WHEN IT PARKS. IF THE WIPER BLADE IS NOT PARALLEL, IT CAN LIFT AWAY FROM THE WINDSHIELD IN FLIGHT.
 1)  Make sure that the wiper blade moves to the park position off the windshield glass and against the stop.
 NOTE: The blade should turn and align with the wiper arm.
____
 S 865-006
 (5) Remove electrical power (AMM 24-22-00/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 WINDSHIELD WIPER BLADE - REMOVAL/INSTALLATION
_____________________________________________
 1.  General_______
 A.  This subject has two tasks, one for the removal and one for the installation of the windshield wiper blade. In this procedure, you will put a pad under the wiper arm, unfasten and remove the wiper blade, and install the replacement blade.
 B.  The same procedure is for the left or right wiper blades. No adjustment is necessary after installation of the wiper blade.
 TASK 30-42-01-004-001
 2.  Windshield Wiper Blade Removal (Fig. 401)______________________________
 A.  Consumable Materials
 (1) G00507, Cloth - Lint Free (to protect windshield from wiper arm)
 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. 1 Right Window
 D.  Procedure
 S 284-002
 (1)  Make sure that the windshield wiper arms are in the parked position.
 S 864-003
 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.
　
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