(3)
DATE is displayed in days, months, and years up to 31 days, 12 months, and 99 years.
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747-400 MAINTENANCE MANUAL
GLARESHIELD
PANEL (P72)
CAPT'S INSTRUMENT
PANEL (P1)
F/O'S CLOCK SWITCH . CAPT'S CLOCK
SEE B SEE A
CAPT'S CLOCK
SWITCH
SEE B
F/O'S INSTRUMENT PANEL (P3) . F/O'S CLOCK
SEE A
FLIGHT COMPARTMENT
CHRONOGRAPH
SWITCH
DATE DATE CONTROL SWITCH
CHR
60
DAY MO/YR
CLOCK
50
10
GMT
ET/CHR CLOCK SWITCH
40
20 B
RUN
30
HLD GREENWICH RESET
ELAPSED TIME MEAN TIME CONTROL SWITCH CONTROL SWITCH
CLOCK
A
Clock Component Location Figure 1
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747-400
MAINTENANCE MANUAL
(4)
The pushbutton DATE control switch is located on the clock bezel upper right corner. With the SET switch in RUN position, first activation of the DATE switch interrupts the GMT display and replaces it with the day and month for one second (a colon will not display), and then the year for one second. The day/month and year displays alternate at one second intervals until the DATE switch is depressed again, returning the display to GMT function.
(5)
Setting the date can be accomplished by the combined use of the SET switch and the pushbutton DATE switch. The day control function on the SET switch positions are: D, M, and Y, which are located adjacent to HS, MS, and HLD of the GMT control, respectively. Each function is operated as follows:
(a)
The D setting is used for changing the day display. When in this position, the day display automatically advances at a rate of one day per second up to maximum value of 31, 30, 29, or 28 depending on the month setting and reincrementing from 01. The month display does not change.
(b)
The M setting is used for changing month display. When in this position, the month display automatically advances at a rate of one month per second, up to maximum value of 12 and reincrementing from 01. The day display does not change.
(c)
The Y setting is used for changing year display. Turning the SET switch to Y position will cause the two right hand digits to update one year per second up to maximum value of 99 and reincrementing from 00. The two left hand digits will be blank.
(6)
ET is displayed in hours and minutes up to 99 hours and 59 minutes with a colon between hours and minutes.
(7)
The ET control switch is located on the clock bezel lower left corner. ET selector positions are: RESET, HLD, and RUN.
(a)
RESET blanks and sets the ET display to zero. The ET control is spring loaded and will automatically return to HLD from RESET when the control is released.
(b)
HLD stops and holds the ET accumulator and display at the indicated time when the control is set to HLD.
(c)
In the RUN position, time is accumulated from the last hold or reset condition. The display automatically advances from the indicated time.
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MAINTENANCE MANUAL
(8)
CHR is displayed in minutes and seconds up to 99 minutes 59 seconds and the sweep second hand displays seconds. CHR display has priority over ET display. If ET is being displayed and CHR is selected, the display will reset to zero and start displaying CHR time. ET will continue accumulating so when CHR is reset, ET will reappear on the display. Operating the CHR does not affect accuracy of ET.
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