CAUTION
DO NOT OPERATE THE WINDSHIELD WIPER ON DRY GLASS. THE
WIPER WILL CAUSE DAMAGE TO THE WINDSHIELD. ALWAYS SUPPLY
WATER TO THE WINDSHIELDS BEFORE YOU OPERATE THE WIPER.
(a) Supply a continuous spray of clean water to the windshield.
NOTE: For windshields with a hydrophobic coating, deionized or distilled water is
recommended during the wiper test. Water with a high mineral content can cause
marks on the coated glass surface that are difficult to remove. If water with a high
mineral content is used on a windshield with a hydrophobic coating, flush the
windshield surface after the wiper test with deionized or distilled water, or remove
the remaining water on the windshield with a cotton cloth.
(b) Turn the wiper switch to LOW and let the wiper operate for one or two cycles.
(c) Turn the wiper switch to PARK.
(d) Stop the water spray.
(e) Make sure the wiper arm goes back to the parked position with the wiper blade near the
bottom edge of the windshield.
(f) Make sure the wiper arm is parallel to the bottom edge of the windshield.
(g) Compare the sweep pattern to (Figure 201).
SUBTASK 30-42-31-820-005
(4) If you find a problem with the sweep pattern of the wiper arm, do these steps to adjust the
sweep pattern:
(a) Measure the distance that the tip of the wiper blade needs to move.
(b) Make a mark on the adjustment sleeve and wiper motor shaft to show the current
installation.
(c) Remove the windshield wiper arm. To remove the arm, do this task: Windshield Wiper
Arm Removal, TASK 30-42-31-000-801.
(d) Re-install the windshield wiper arm. To install the arm, do this task: Windshield Wiper Arm
Installation, TASK 30-42-31-400-801.
NOTE: The arm assembly installation procedure has details on how to adjust the arm
assembly.
SUBTASK 30-42-31-860-012
(5) Put the wiper to its parked position:
CAUTION
DO NOT OPERATE THE WINDSHIELD WIPERS ON DRY GLASS. THE
WIPER WILL CAUSE DAMAGE TO THE WINDSHIELD. ALWAYS SUPPLY
WATER TO THE WINDSHIELDS BEFORE YOU OPERATE THE WIPER.
(a) Supply a continuous spray of clean water to the windshield.
NOTE: For windshields with a hydrophobic coating, deionized or distilled water is
recommended during the wiper test. Water with a high mineral content can cause
marks on the coated glass surface that are difficult to remove. If water with a high
mineral content is used on a windshield with a hydrophobic coating, flush the
windshield surface after the wiper test with deionized or distilled water, or remove
the remaining water on the windshield with a cotton cloth.
(b) Set the wiper switch to LOW.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
30-42-31
Page 219
D633A101-ILF Oct 15/2017
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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