CLOCK OPERATIONAL CHECK

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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