SUBTASK 30-42-11-420-003
(2) Install the washer [2] and a new nut [1].
SUBTASK 30-42-11-420-004
CAUTION
IF YOU DO NOT USE THE CORRECT TORQUE, IT CAN CAUSE THE WIPER
BLADE TO MOVE AND TURN. DAMAGE TO AIRCRAFT SKIN AND THE
WINDSHIELD STRUCTURE CAN OCCUR.
(3) Tighten the nut [1] to 16 ±2 in-lb (2 ±0 N·m).
SUBTASK 30-42-11-420-006
(4) Remove the pad from the windshield.
SUBTASK 30-42-11-860-005
(5) Remove the safety tags and close these circuit breakers:
CAPT Electrical System Panel, P18-3
Row Col Number Name
B 1 C00055 ANTI-ICE & RAIN WSHLD WIPER RIGHT
B 3 C00054 ANTI-ICE & RAIN WSHLD WIPER LEFT
C 1 C00523 HEATERS CAPT PITOT
D 5 C00525 HEATERS F/O PITOT
D 6 C00524 HEATERS AUX PITOT
F. Windshield Wiper Blade Installation Test
SUBTASK 30-42-11-720-001
(1) Do a test of the blade assembly [4]:
CAUTION
DO NOT OPERATE THE WIPER ON A DRY WINDSHIELD. YOU CAN
DAMAGE 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) Turn the windshield wiper switch to LOW.
(c) Make sure that the operation of the blade assembly [4] is smooth and effective.
(d) Turn the switch to PARK.
SUBTASK 30-42-11-720-002
(2) Do this task: Windshield Wiper Arm Force Check/Adjustment, TASK 30-42-31-820-801.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
30-42-11
Page 406
D633A101-ILF Jun 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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