(2)
Close 6H8 ELEX CLOCK and 6H17 CLOCK DISP circuit breakers P6 on Main Power Distribution Panel.
(3)
Operate the SET switch to control and display Greenwich Mean Time.
(4)
Press the DATE pushbutton to display DATE. To control DATE display press and hold DATE pushbutton and operate SET switch.
(5)
Operate the ET switch to control and display the Elapsed Time or operate the CHR switch or the remote CLOCK switch to display the Chronographic Time, as applicable.
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A
747-400 FAULT ISOLATION/MAINT MANUAL
CLOCKS
* SEE THE WDM EQUIPMENT LIST
Clocks - Component Index
Figure 101
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A
747-400
FAULT ISOLATION/MAINT MANUAL
GLARESHIELD PANEL, P72
CAPTAIN'S CLOCK, N143
SEE A
CAPTAIN'S CLOCK SWITCH, S920
SEE B
P1 PANEL
CHRONOGRAPH
SWITCH CHR FIRST OFFICER'S CLOCK SWITCH, S921
SEE B
P3 PANEL
P6 PANEL
FIRST OFFICER'S CLOCK, N146
SEE A
FLIGHT COMPARTMENT
DATE
60
DAY MO/YR
50 10
GMT
ET/CHR
40 20
RUN
30
HLD RESET
ELAPSED TIME CONTROL SWITCH
CAPTAIN'S, FIRST OFFICER'S CLOCK, N143, N146
A
DATE
CONTROL
SWITCH
CLOCK
CAPTAIN'S, FIRST OFFICER'S
CLOCK SWITCH,
S920, S921
B
GREENWICH MEAN TIME CONTROL SWITCH
Clock - Component Location
Figure 102
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A
747-400 MAINTENANCE MANUAL
CLOCKS - ADJUSTMENT/TEST
________________________
1. General_______
A. The task in this procedure is an operational test for each clock.
TASK 31-25-00-715-001
2. Operational Test - Clocks_________________________
A. Standard Tools and Equipment
(1) Stop Watch
B. References
(1) AMM 24-22-00/201, Manual Control
C. Access
(1) Location Zone
221 Flight Compartment, Left
222 Flight Compartment, Right
D. Prepare for the Test
S 865-002
(1)
Supply electrical power (AMM 24-22-00/201).
S 865-003
(2)
Put the SET (lower right corner) control switch to RUN on the Captain's clock.
S 865-011
(3)
Put the SET (lower right corner) control switch to RUN on the First Officer's clock.
S 865-004
(4)
Make sure these circuit breakers are closed:
(a) P6, Main Power Distribution Panel
1) 6H08, ELEX CLOCK
2) 6H17, CLOCK DISP
S 865-005
(5) Make sure that the GMT and the ET/CHR are at zero on the Captain's clock.
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747-400 MAINTENANCE MANUAL
S 865-010
(6) Make sure that the GMT and the ET/CHR are at zero on the First Officer's clock.
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