Digital Clock - Cirrus SR22 Pilot Operating Handbook

Cirrus Design Section 7
SR22 Airplane Description

Digital Clock

Serials 0002 through 0434; The airplane is equipped with a 2¼"
Davtron M803 digital clock located on the left instrument panel
immediately outboard of the airspeed indicator. The clock provides
Universal Time (UT), Local Time (LT), Elapsed Time (ET), Outside Air
Temperature (OAT) in ° C or ° F, and Voltmeter functions. All features
and functions are selectable from control buttons on the clock face.
The clock receives the OAT signal from a temperature sensor installed
immediately forward of the pilots door. The clock operates on 28 VDC
supplied through the 5-amp ENGINE INST circuit breaker on Main Bus
1. Keep-alive power is supplied through a 5-amp fuse connected to the
airplane Main Distribution Bus in the Master Control Unit (MCU). A
replaceable AA battery is installed to provide up to three years battery
back up.
SEL and CTL Buttons
All time keeping and set functions are addressable using the Select
and Control buttons below the time display. Upon power up the clock
will display Universal Time (UT). Pressing the Select button 3 times
will display Local Time (LT), and Elapsed Time (ET) sequentially.
Pressing the button again will return the display to UT.
Set UT or LT:
Use the Select button to select UT or LT as desired. Simultaneously
press Select and Control buttons (tens of hours LED will flash). Press
Control button repeatedly as required to increment digit to desired
value. Press Select button to select the next digit to be set. After all
digits have been set, press the Select button again to return to the
normal mode.
Flight Time (FT):
The flight time (FT) option is not available in this installation. If FT is
selected the display will 'zero.'
Elapsed Time (ET):
The ET mode may be used either in 'count-up' or in 'count-down'
modes.
To set the count-up mode:
1. Select ET using the Select button; and
P/N 13772-001 7-107
Revision A10