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CLOCK VISUAL CHECK
CLOCK   OPERATIONAL   CHECK   (Continued)

TM-55-1520-240-T-2 CH-47D Heilcopter Manual
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TM   55-1520-240-T 9-22.3   CLOCK   OPERATIONAL   CHECK 9-22. 3 INITIAL  SETUP References: Applicable   Configurations: TM   55-1520-240-23 With TM   55-1520-240-10 Tools: Equipment    Condition: None TM   55-1520-240-23: Battery   Connected Materials: Electrical Power On None Hydraulic  Power  Off Personnel  Required: Visual  Check  of  Clock  Performed  (Task  9-22.2) Aircraft  Electrician TASK RESULT 1.  Check   that   PLT   CLOCK   circuit   breaker   (1) If  PLT  CLOCK  circuit  breaker  (1)  is  open,  close  it.  If  it is closed. opens  again,  go  to  task  9-22.4. 2.  Check   that   CPLT   CLOCK   circuit   breaker If  CPLT  CLOCK  circuit  breaker  (2)  is  open,  close  it.  If (2) is closed. it  opens  again,  go  to  task  9-22.5. 3.  Check   GMT   display   (3)   on   pilot   and   co- GMT  display  (3)  shall  indicate  greenwich  mean  time. pilot  clocks  (4)  and  (5). If  display  is  blank,  replace  battery  on  back  of  clock and  set  clock.  Refer  to  TM  55-1520-240-20  for  set- ting   instructions. 4.  Press  and  hold  SELECT  button  (6)  on  pilot’s Clock  display  (7)  shall  indicate  88:88  and  annuncia- clock  (4)  for  three  seconds. tors  (8)  shall  light.  If  display  does  not  indicate  88:88 and  annunciators  are  not  lit,  go  to  task  9-22.6. 5.  Rotate   DIM   control   (9)   on   pilot’s   clock Clock   display   brightness   shall   vary.   If   it   does (4). not,   replace   pilot’s   clock. 6.  Press  and  hold  SELECT  button  (6)  on  copilot’s Clock  display  (7)  shall  indicate  88:88  and  annuncia- clock  (5)  for  three  seconds. tors  (8)  shall  light.  If  display  does  not  indicate  88:88 and  annunciators  are  not  lit,  go  to  task  9-22.7. 7.  Rotate   DIM   control   (9)   on   copilot’s   clock Clock  display  brightness  shall  vary.  If  it  does  not, (5). replace  copilot’s  clock. FOLLOW-ON    MAINTENANCE: TM   55-1520-240-23: Battery  Disconnected Electrical Power Off 9-368 Change  2 GO TO NEXT PAGE







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