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 D.

E.
F.
A 737-300/400/500MAINTENANCE MANUAL
 (4)  
The FS (fast slew) setting is used for fast slew operation. When in this position, the hours display advances at a rate of 1 hour in each second. The minutes display is stopped.

AIRPLANES WITH P/N 2610-07-1 CLOCKS; The top display also functions as a date display. When the DATE button on the clock is pushed, the date will come into view. When the DATE button is pushed again, the top display will switch back to the GMT. When the date is displayed, the GMT switch controls the setting of the date. The date control functions are D, M and Y, which are in the same position as the FS, SS and HLD settings.

 (1)  
The D setting is used for changing the day display. When in this position, the day display advances at a rate of 1 day in each second up to a maximum value of 31, 30, 29 or 28 depending on the month.

 (2)  
The M setting is used for changing the month display. When in this position, the month display advances at a rate of 1 month in each second up to a maximum value of 12.

 (3)  
The Y setting is used for changing the year display. When in this position, the year display advances at a rate of 1 year in each second up to a maximum value of 99.

The bottom display provides elapsed time (ET) from 00 hours 00 minutes to 99 hours 59 minutes and chronographic time (CHR) from 00 minutes to 99 minutes. (The sweep second hand shows the seconds for chronographic time.) Control of this display is provided by the ET and CHR switches.The elapsed time (ET) control switch is located in the lower left corner of the clock. This switch operates as follows:

 (1)  
In the RESET position, the ET display is blanked and the elapsed time indication is set to zero. The RESET position is spring loaded to return the switch to the HLD position.

 (2)  
The HLD (hold) position of the switch freezes the current ET display.

 (3)  
In the RUN position, time is accumulated from the last hold or reset condition. The display advances from this value.

 (4)  
The CHR switch is located in the upper left corner. This switch operates as follows:

 (a)  
The first press of the switch starts the chronograph running.

 (b)  
A second press of the switch stops the chronograph at the current displayed value.

 (c)  
A third press of the switch resets the CHR accumulator to zero. The contents of the ET accumulator is then displayed. If the ET accumulator contains zero, the elapsed time display is blanked with the sweep second hand to zero.

 (d)  
Chronograph operation replaces the display of the elapsed time, but does not affect the internal operation of the ET accumulator.

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A
737-300/400/500MAINTENANCE MANUAL
 G.  Loss of the 28v dc battery bus power will cause the clock controls to become inactive, the displays to blank, and the sweep second hand to stop and hold. The internal time functions will continue accumulating as long as the 28v dc hot battery bus power is applied. Restoration of lost power will restore all functions to the correct times without loss of accuracy. Loss of the 28v dc hot battery bus power will cause the clock controls to become inactive, the displays to blank, and the sweep second hand to stop and hold. Reapplication of power will zero the accumulators and reset the sweep second hand to the 12 o'clock position.
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737-300/400/500MAINTENANCE MANUAL
 CLOCKS - ADJUSTMENT/TEST
________________________
 1.  General_______
 A.  There is one task in this procedure. The task is an operational test of the clocks. There are two clocks on the airplane; one in the captain's instrument panel P1 and one in the first officer's instrument panel P3.
　
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