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 D.  ON GUN 105-999; The clocks also provide GMT/DATE as a data output on an ARINC 429 digital data bus. The captain's clock provides GMT/DATE to the left flight management computer and the digital flight data acquisition unit (DFDAU). The first officer's clock provides GMT/DATE to the right flight management computer. The flight management computer control display units (FMC-CDU) display the clock's GMT output (AMM 34-61-00). The GMT output is provided in hours, minutes, and seconds. The time is accurate to |1 second per 200 hours at 25°C unless power to the clock is interrupted.
 2.  Component Details (Fig. 1)_________________
 A.  Clocks
 (1)  
The electronic clocks are located on the captain's and first officer's instrument panels, respectively. They are microprocessor controlled with two LCD displays, controls, and a sweep second hand.

 (2)  
The upper display (GMT) provides GMT continuously from 00 hours 00 minutes to 23 hours 59 minutes. The GMT display is controlled by the GMT switch located in the lower corner of the indicator as follows:

 (a)  
The RUN setting of this switch is the normal operating position for the clock. GMT is shown continuously while in this mode.

 (b)  
The HLD (hold) setting is used to freeze the GMT display. Setting the switch to this position will hold the display at its present indicated value.

 

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MAINTENANCE MANUAL

FIRST OFFICER'S CLOCK
CAPTAIN'S  CLOCK
SWITCH
CLOCK SWITCH  SWITCH
ELAPSED TIME

ELAPSED TIME MEAN TIME CONTROL SWITCH MEAN TIME
CLOCK  CONTROL CONTROL SWITCH CLOCK CONTROL SWITCH

 

SWITCH
GUN 001-104
GUN 105-999
GUN 051
GUN 001-050,052-999

Clock - Component Location
Figure 1

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 (3)
(4)

(5)

(6)

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MAINTENANCE MANUAL

 (c)  
The FS (fast slew) or the HS (hour slew) setting is used for fast slew operation. When in this position, the hours display automatically advances at a rate of 1 hour/second. The minutes display is frozen at its present indicated value.

 (d)  
The SS (slow slew) or MS (minute slew) setting is used for slow slew operation. When set to this position, the seconds display is reset to zero. The minute display automatically advances at a rate of 1 minute/second. The hours display is frozen at its present indicated value.

ON GUN 105-999; 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:
　
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