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WINDSHIELD   WIPERS   VISUAL   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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