Specifications

Information Manual 7-101
Cirrus Design Section 7
SR20 Airplane Description
FLIGHT. Recording begins when the airplane reaches a speed of
approximately 35 KIAS and is controlled by a differential pressure
switch connected to the Pitot-static system. 28 VDC for hour meter
operation is supplied through the 5-amp FUEL QTY / HOBBS circuit
breaker on Main Bus 1.
Digital Clock
Serials 1268 through 1337; 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.
March 2010