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CLOCKS - ELAPSED TIME
EFFECTIVITY
SHZ ALL 31-25-00
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D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
31-25-00-009
CLOCKS - ELAPSED TIME
CLOCKS - ELAPSED TIME
EFFECTIVITY
SHZ ALL 31-25-00
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D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
31-25-00-009
General
The minutes show on the lower display. The sweep second
hand indicates the seconds. The chronograph function does not
calculate hours.
When the chronograph time shows, the clock continues to
update the elapsed time function internally.
Use the chronograph control switch on the clock to start, stop,
and reset the chronograph.
CLOCKS - CHRONOGRAPH FUNCTION
EFFECTIVITY
SHZ ALL 31-25-00
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D633A101-SHZ1 Jun 10/2003
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
31-25-00-010
CLOCKS - CHRONOGRAPH FUNCTION
CLOCKS - CHRONOGRAPH FUNCTION
EFFECTIVITY
SHZ ALL 31-25-00
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D633A101-SHZ1 Jun 10/2003
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
31-25-00-010
Inputs
The clock gets 28v dc for power and clock displays.
The microprocessor senses the inputs from all the bezel
controls.
The bezel light sensor senses the ambient light in the flight
compartment and sends the data to the microprocessor.
The global positioning system (GPS) sends time and date
information to the clock.
Power
Power for the operation of the clock and to keep the time base
comes from the battery bus. When the battery bus is not
available for more than 200ms, the clock uses hot battery bus
power. The hot battery bus power keeps the time base but does
not supply power for the display or output of clock data. This lets
the clock time base continue operation when power is not
available from the battery bus.
Calculations and Outputs
A microprocessor does all the time calculations and controls
the outputs of the clock.
An LCD driver supplies display information to the clock display.
ARINC 429 clock data goes to the FDAU, the FMC and the voice
recorder.
Output to FDAU, FMC, and Voice Recorder
The clock sends this data to the FDAU, the FMC, and the voice
recorder:
* Clock time
* Clock date.
CLOCKS - FUNCTIONAL DESCRIPTION
EFFECTIVITY
SHZ ALL 31-25-00
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D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
31-25-00-011
CLOCKS - FUNCTIONAL DESCRIPTION
CLOCKS - FUNCTIONAL DESCRIPTION
EFFECTIVITY
SHZ ALL 31-25-00
Page 23
D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
31-25-00-011
Power
This graphic is for reference purpose only.
CLOCKS - SYSTEM SUMMARY
EFFECTIVITY
SHZ ALL 31-25-00
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
31-25-00-012
CLOCKS - SYSTEM SUMMARY
CLOCKS - SYSTEM SUMMARY
EFFECTIVITY
SHZ ALL 31-25-00
Page 25
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
31-25-00-012
Purpose
The flight data recorder system (FDRS) stores airplane
parameters and system data for the last 25 hours of operation.
The flight data recorder (FDR) protects the parameters and the
system data. If there is an airplane incident, these parameters
supply data on flight conditions and airplane systems operation.
Airline personnel can also use the data to make an analysis of
system performance during airplane maintenance.
Abbreviations and Acronyms
* ac - alternating current
* A/C - aircraft
* ACARS - aircraft communications addressing and reporting
system
* ACMS - aircraft conditioning monitoring system
* A/D - analog to digital
* ADC - air data computer
* ADIRU - air data inertial reference unit
* ADL - airborne data loader
* ADV - advance
* ALRT - alert
* ALT - alternate
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