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(3) Wiring Diagrams
Refer to Chapter 92 for the wiring diagrams for the central warning systems.
AIRCRAFT
Indicating Systems DA 40 Series
AMM
Page 4
20 Sep 2007 31-50-00 Doc # 6.02.01
Rev. 5
B. White Wire Annunciator Panel
(1) Warning Messages
A warning is indicated by a continuous aural alert (sounded in the airplane's intercomm system),
flashing of the red WARNING light, and flashing of the red warning light associated with the
affected system.
By pressing the 'acknowledge' button, which is now illuminated green, the aural alert will be
terminated, and the WARNING light will be extinguished. The warning light associated with the
affected system will change from flashing to solid illumination.
(2) Caution Messages
A caution is indicated by a short aural alert (sounded in the airplane's intercomm system),
flashing of the amber CAUTION light, and flashing of the amber caution light associated with
the affected system.
By pressing the 'acknowledge' button, which is now illuminated green, the CAUTION light will
be extinguished. The caution light associated with the affected system will change from flashing
to solid illumination.
The LOW FUEL caution message is displayed in a slightly different manner (extended
functionality), which is described below.
(3) Warning, Caution and Status Lights
) OIL PRESS
Red warning light indicating low oil pressure. An oil pressure transducer installed in
the engine accessory housing activates the oil pressure warning message when the
oil pressure is less than 25 psi.
) FUEL PRESS
Red warning light indicating low fuel pressure. A fuel pressure transducer installed in
the fuel line between the engine driven fuel pump and the injector activates the fuel
pressure warning message when the fuel pressure is less than 14 psi.
AIRCRAFT
DA 40 Series
AMM
Indicating Systems
Doc # 6.02.01
Rev. 5 31-50-00 Page 5
20 Sep 2007
) LOW FUEL
Amber caution light indicating low fuel level in the left or right fuel tank. Fuel level
switches in each fuel tank activate the low fuel caution message.
As soon as the amount of usable fuel in one tank is less than 3 US gal (±1 US gal),
a caution message is displayed in the usual manner (momentary aural alert, flashing
CAUTION light, flashing LOW FUEL caution light). Termination of the message is also
done as usual ('acknowledge', CAUTION light is extinguished, LOW FUEL caution
light changes to solid illumination).
As soon as the amount of usable fuel in the second tank is also less than 3 US gal
(±1 US gal), a caution message is displayed in a different manner. A continuous aural
alert is sounded in the airplane's intercomm system, the amber CAUTION light is
flashed, and the amber LOW FUEL caution light is flashed.
By pressing the 'acknowledge' button, which is now illuminated green, the aural alert
will be terminated, and the CAUTION light will be extinguished. The LOW FUEL
caution light will continue to be flashed.
) START Red warning light indicating that the starter solenoid is energized. The warning light
receives an electrical current from the starter side of the starter solenoid. The starter
warning message is displayed when the connection between the starter motor and the
engine has not been broken. This occurs when the pinion of the starter motor remains
engaged with the propeller flywheel.
The warning light is illuminated continuously as long as the starter is being operated.
In this case the WARNING light and the aural alert will not be activated.
) PITOT Amber caution light indicating that the Pitot heating system is OFF. The caution light
receives an electrical current from the heater side of the Pitot heat relay. The Pitot
heating caution message is displayed when the Pitot heating is not switched ON, or
when there is a failure of the Pitot heating system. Prolonged operation of the Pitot
heating on the ground can also cause the Pitot heating caution message to be
displayed. In this case it indicates the activation of the thermal switch, which prevents
overheating of the Pitot heating system on the ground. This is a normal function of the
system. After a cooling period, the heating system will be switched on again
automatically.
AIRCRAFT
Indicating Systems DA 40 Series
AMM
Page 6
20 Sep 2007 31-50-00 Doc # 6.02.01
Rev. 5
Annunciations Acknowledge
Button
White Wire CAUTION
WARNING
START ALTERNATOR PITOT
DOORS LOW VOLTS IGNITION
FUEL PRESS LOW FUEL TRIM FAIL
OIL PRESS - -
Figure 2: Central Warning System: White Wire Annunciator Panel
AIRCRAFT
DA 40 Series
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钻石40系列AMM 2(47)
