WINDSHIELD WIPERS OPERATIONAL CHECK

WSHLD WIPER CIRCUIT BREAKER WILL NOT STAY CLOSED

TM-55-1520-240-T-3 CH-47D Heilcopter Manual
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TM 55-1520-240-T 12-4.3 WINDSHIELD WIPERS OPERATIONAL CHECK 12-4.3 INITIAL SETUP References: T M 5 5 - 1 5 2 0 - 2 4 0 - 23 FOLLOW-ON MAINTENANCE: T M 5 5 - 1 5 2 0 - 2 4 0 - 2 3: Electrical power off. Battery disconnected. Hose Disconnected Applicable Configurations: All Tools: Water Hose Stop Watch Materials: None Personnel Required: 67U10 Medium Helicopter Repairer 68F20 Aircraft Electrician Equipment Condition: T M 5 5 - 1 5 2 0 - 2 4 0 - 23 Battery Connected Electrical Power On Hydraulic Power Off Visual Check Of Windshleld Wipers Performed (Task 12-4.2) Hose Connected To Water Supply TASK RESULT 1. Check that WSHLD WIPER circuit breaker (1) IS closed. Do not operate windshield wipers on dry or dirty windshield. Wind- shield can become scratched. 2. Spray pilot’s and copilot’s windshields with water. Continue spraylng water until check is complete. 3. Set WINDSHIELD WIPERS switch (2) to SLOW. If WSHLD WIPER clrcult breaker (1) is open, close it. If it opens again, go to task 12-4.4. Both windshield wiper blades (3) shall move back and forth across pilot and copilot windshields ap- proximately 80 times per minute without hitting windshield framing. If blades don’t move or move too slow, go to task 12-4.5. If blades hit framing, adjust wiper arm (4) position. 4 Set WINDSHIELD WIPERS switch (2) to MED. 5 Set WINDSHIELD WIPERS switch (2) to FAST. Both windshield wiper blades (3) shall move faster. If not, go to task 12-4.5. Both wiper blades (3) shall move back and forth across windshields approximately 138 times per minute. If not, go to task 12-4.5. If excessive noise comes from direction of overhead panel, go to task 12-4.6 Both wiper blades (3) shall immediately stop. If not, replace WINDSHIELD WIPERS switch (2). 6. Set WINDSHIELD WIPERS switch (2) to OFF. 7. Set and hold WINDSHIELD WIPERS switch (2) to PARK. 8 Release WINDSHIELD WIPERS switch (2). 12-74 Each wiper blade (3) shall move to inboard edge of it’s windshield (park position). If not go to task 12- 4.7. WINDSHIELD WIPERS switch (2) shall return to OFF position. If not, replace WINDSHIELD WIPERS switch. END OF TASK

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