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* GPS - global positioning system
* hld - hold
* LCD - liquid crystal display
* man - manual
* MMR - multi-mode receiver
* MO - month
* UTC - universal time (coordinated)
* YR - year
CLOCKS - GENERAL DESCRIPTION
EFFECTIVITY
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CLOCKS - GENERAL DESCRIPTION
CLOCKS - GENERAL DESCRIPTION
EFFECTIVITY
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General
These are the clock system components:
* Captain clock
* First officer clock.
CLOCKS - COMPONENT LOCATION
EFFECTIVITY
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CLOCKS - COMPONENT LOCATION
CLOCKS - COMPONENT LOCATION
EFFECTIVITY
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Power
The clocks get power from the 28v dc hot battery bus through
the CLOCK circuit breaker. 28v dc through the CLOCK DISPLAY
circuit breaker supplies power to the clocks to let the clocks
show date and time data. Each clock gets 5v ac from master dim
and test for its internal instrument lights.
Digital Input
The multi-mode receiver (MMR) sends global positioning
system time and date to the captain and first officer clocks.
Digital Output
The captain clock sends date and time data to the FMC 1, the
FDAU, and the voice recorder on an ARINC 429 data bus. The
first officer clock does not have a digital output.
CLOCKS - INTERFACES
EFFECTIVITY
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CLOCKS - INTERFACES
CLOCKS - INTERFACES
EFFECTIVITY
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CLOCKS - INTERFACES
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Displays
The clock is an LCD display.
Chronograph Switch
The chronograph switch is a pushbutton switch. Use this switch
to start, stop, and reset the chronograph function.
Sweep Second Hand
The sweep second hand only works with the chronograph
function of the clock.
The sweep second hand is an LCD display.
Elapsed Time and Reset Pushbutton
The elapsed time pushbutton controls the elapsed time function
of the clock. Select the pushbutton once to run the elapsed time.
Select the pushbutton again to hold the elapsed time. The word
RUN or HLD shows on the lower left part of the LCD display.
The reset switch pushbutton the elapsed time to 0.
Time/Date and Set Pushbutton
The time/date pushbutton controls the mode the clock is in.
These are the modes:
* UTC time
* UTC date
* Manual time
* Manual date.
Select the pushbutton once and to see the UTC (universal time
coordinated) time. Select the pushbutton again to see UTC date.
Select the pushbutton again to see manual time. Select the
pushbutton again to see manual date. The word UTC or MAN
(manual) shows on the upper right part of the LCD display. Time
or date shows on the time/date window.
In the MAN position, clock time and date come from the clock. In
the UTC (universal time coordinated) position, clock time and
date come from the global positioning system.
The set pushbutton lets you set the MAN time or MAN date. If
you see MAN time with the time/date pushbutton then you can
set the time. Select the set pushbutton and the hours flash. Use
the plus or minus pushbutton to adjust the hours. Select set
again and the minutes flash. Use the plus or minus pushbutton
to adjust the minutes. Select set again to run the time.
If you see MAN date with the time/date pushbutton then you can
　
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