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the knob to the shaft.
AIRCRAFT
Indicating Systems DA 40 Series
AMM
Page 204
20 Sep 2007 31-11-00 Doc # 6.02.01
Rev. 5
Intentionally left blank
AIRCRAFT
DA 40 Series
AMM
Indicating Systems
Doc # 6.02.01
Rev. 5 31-20-00 Page 1
20 Sep 2007
Section 31-20
Independent Instruments
1. General
This Section tells you about the digital chronometer which can be installed in the DA 40. Refer to the
equipment manufacturers' manuals for more data about the equipment.
The Astrotech LC-2 digital chronometer or the Davtron M803 digital chronometer can be installed in
the instrument panel of the DA 40.
2. Description
A. Astrotech LC-2 Digital Chronometer
Figure 1 shows the Astrotech LC-2 digital chronometer. It is located in the instrument panel, see
Section 31-10.
The front of the Astrotech LC-2 digital chronometer consists of 3 buttons and an LCD with 4 digits.
The background of the LCD is illuminated.
The chronometer has two functions:
) Clock function (time and date). The hours can be displayed in 12 hour format or 24 hour format.
) Chronometer function (stop watch, 24-hour capacity). The unit displays the minutes and
seconds during the first hour, then the hours and minutes until 24 hours.
The chronometer is supplied with power by an internal 1.5 V AA battery. The lighting is supplied
with power by the main bus.
AIRCRAFT
Indicating Systems DA 40 Series
AMM
Page 2
20 Sep 2007 31-20-00 Doc # 6.02.01
Rev. 5
Date/Advance-
Start/Stop
Button
Mode
Button
Set/Reset
Button
20 :4.9 LCD Display
ASTRO
LC-2
TIMER
RST
SET
MODE
ADV
DT/AV
CLOCK
QUARTZ CHRONOMETER
TECH
Figure 1: Astrotech LC-2 Digital Chronometer
AIRCRAFT
DA 40 Series
AMM
Indicating Systems
Doc # 6.02.01
Rev. 5 31-20-00 Page 3
20 Sep 2007
B. Davtron M803 Digital Chronometer
Figure 2 shows the Davtron M803 digital chronometer. It is located in the instrument panel, see
Section 31-10 or 31-11. Refer to Section 34-10 for more information about the OAT indication
functions of the unit.
The front of the Davtron M803 digital chronometer consists of 3 buttons and an LCD. The
background of the LCD is illuminated.
The chronometer has the following functions:
) Clock function. The time can be displayed in 'Universal Time' format or 'Local Time' format.
) Elapsed Timer Count Up. The unit displays the minutes and seconds during the first hour, then
the hours and minutes until 99 hours and 50 minutes.
) Elapsed Timer Count Down. A count down from any time, a maximum of 59 minutes and 59
seconds can be set.
) Flight Time Alarm. The display will flash when the Flight Time equals the previous set alarm
time.
) OAT/Volts. One button control steps sequentially through E, F, C. (E-Voltage (EMF), F-OAT
Fahrenheit, C-OAT Centigrade).
The chronometer and lighting are supplied with power by the main bus. The chronometer has an
internally back-up 1.5 V AA battery.
AIRCRAFT
Indicating Systems DA 40 Series
AMM
Page 4
20 Sep 2007 31-20-00 Doc # 6.02.01
Rev. 5
Figure 2: Davtron M803 Digital Chronometer
AIRCRAFT
DA 40 Series
AMM
Indicating Systems
Doc # 6.02.01
Rev. 5 31-20-00 Page 201
20 Sep 2007
Maintenance Practices
1. General
This Section tells you how to replace the digital chronometer. Refer to the equipment manufacturer's
manuals for more data on the digital chronometer.
2. Remove/Install the Digital Chronometer
A. Remove the Digital Chronometer
Detail Steps/Work Items Key Items/References
(1) Open the OAT-circuit breaker. Only for the Davtron M803.
(2) Remove the instrument panel cover. Refer to Section 25-10.
(3) Disconnect the electrical cable from the
chronometer.
(4) Remove the screws which attach the
chronometer to the instrument panel.
Hold the chronometer.
(5) Move the chronometer out of the instrument
panel and lift clear of the airplane.
AIRCRAFT
Indicating Systems DA 40 Series
AMM
Page 202
20 Sep 2007 31-20-00 Doc # 6.02.01
Rev. 5
B. Install the Digital Chronometer
Detail Steps/Work Items Key Items/References
(1) Move the chronometer into its position in the
instrument panel.
(2) Install the screws which attach the chronometer
to the instrument panel.
(3) Connect the electrical cable to the rear of the
chronometer.
(4) Do a test for correct OAT indication.
S Close the OAT circuit-breaker.
S Set the ALT/BAT switch (Lycoming version)
　
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