CAUTION
DO NOT OPERATE THE WIPER ON A DRY OR DIRTY WINDSHIELD.
ALWAYS SUPPLY WATER TO THE WINDSHIELD BEFORE YOU
OPERATE THE WIPER. THE WIPER WILL CAUSE DAMAGE TO THE
WINDSHIELD.
(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) Do these steps to test the intermittent speed operation of the wiper:
1) Set the windshield wiper switch to INT (P5 overhead panel flight compartment).
NOTE: The test for the pilot's and first officer's wipers are the same. Use the
applicable wiper switch to operate the wiper.
2) Make sure the wiper blade parks near the lower edge of the window during the off
time of the intermittent cycle.
3) Make sure the wiper blades have a minimum overlap of the windshield seal and do
not contact metal structure.
4) Make sure the operation of the wiper is smooth and it clears the water from the
windshield.
5) Make sure the wipers make two complete strokes every 6 to 8 seconds.
NOTE: One Stroke = One Wipe
(c) Do these steps to test the low speed operation of the wiper:
1) Set the windshield wiper switch to LOW.
NOTE: In the LOW position, the wiper blade moves at approximately 160 strokes
per minute.
2) Make sure the operation of the wiper is smooth and it clears the water from the
windshield.
NOTE: One Stroke = One Wipe
(d) Do these steps to test the high speed operation of the wiper:
1) Set the windshield wiper switch to HIGH.
NOTE: In the HIGH position, the wiper blade moves at approximately 250 strokes
per minute.
2) Make sure the operation of the wiper is smooth and it clears the water from the
windshield.
NOTE: One Stroke = One Wipe
(e) Set the windshield wiper switch to LOW.
1) Make sure the wipers go to low speed operation.
(f) Set the windshield wiper switch to INT.
1) Make sure the wipers go to intermittent operation.
(g) Set the windshield wiper switch to PARK.
1) Make sure the wiper blades park near the lower edge of the glass.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
30-42-00
Page 503
D633A101-ILF Jun 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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