Observers' Panels
Figure 1
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M49172
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747-400 MAINTENANCE MANUAL
ATTENDANTS' PANELS, STATIONS 1 AND 2 - DESCRIPTION AND OPERATION
STATION 1 LEFT
Attendants' Panels, Stations 1 and 2
Figure 1
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31-17-12
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C80203
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747-400 MAINTENANCE MANUAL
ATTENDANTS' PANEL - UPPER DECK - DESCRIPTION AND OPERATION
Attendants' Panel - Upper Deck
Figure 1
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747-400 MAINTENANCE MANUAL
CLOCKS - DESCRIPTION AND OPERATION
__________________________________
1. General (Fig. 1)_______
A. Electronic clocks are installed on the captain's and first officer's instrument panels. The two clocks are identical and provide the flight crew with a primary time reference. In addition, they also provide time data (GMT/DATE) as a data output on an ARINC 429 digital data bus to the flight management computer (FMC) system, the central maintenance computer system (CMC) system, and the data management unit (DMU) of the ACMS.
B. From the FMCs, the clock GMT output is displayed on CDU (AMM 34-61-00) POS INIT page. Both CDUs display GMT from the captain's clock, unless it has failed. Both FMCs would then switch over automatically and display GMT from the F/O's clock. The FMC-CDU GMT hour display can be manually changed through the FMC, but the minutes and seconds will still be that which is received from the clocks.
C. Clocks receive operating power from the 28 volt dc main hot battery bus. The 28 volt dc APU battery bus is monitored by the clocks and the clock displays will go blank upon removal of power from this bus. Power from the main hot battery bus is supplied through the ELEX CLOCK circuit breaker. The APU battery bus is monitored through the CLOCK DISP circuit breaker. Both circuit breakers are located on the P6 Main Power Distribution Panel.
2. Captain's and First Officer's Clocks (Fig. 1)____________________________________
A. Each clock has two liquid crystal digital displays (one upper and one lower), and an analog peripheral sweep second hand. The upper digital display provides Greenwich Mean Time (GMT), and date (DAY MO/YR). The lower digital display provides elapsed time (ET), and chronograph time (CHR). The sweep second hand displays CHR seconds.
(1)
GMT is displayed in hours and minutes up to 23 hours and 59 minutes with a colon between hours and minutes. Tenths of minutes and seconds are computed and used as part of the serial digital output but not displayed.
(2)
GMT operation is controlled by the SET switch located on the clock bezel lower right corner. The SET switch positions are: RUN, HLD, MS, and HS.
(a)
RUN is the normal operating position for the GMT control. In this position, GMT accumulator and display update in real time starting at zero seconds.
(b)
HLD (hold) stops the internal GMT accumulation and also holds the GMT displayed time at its accumulated value.
(c)
MS is used for minute slew operation. When set to this position, the MS advances the minute display at one minute per second (the hours display does not change). Advancing the minutes past 59 minutes does not advance the hours display.
(d)
HS (hour slew) advances the hour display at one hour per second (the minutes display does not change).
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