Charge mode
If the HV battery charger is connected to the aircraft and switched on, the DCU will enter a
charging mode. Refer to the High Voltage batteries section.
Fire warning system
The fire warning system is independent of the RES system. It consists of two thermal switches,
a heat-sensitive cable section located in the rear fuselage compartment, a 9 V battery, test
button, LED, and buzzer.
The fire warning system can be tested by pressing the test button. When the test button is
pressed, the system buzzer will sound and the indication LED will light up. If the 9 V battery is
drained, the system will not work.
Figure 8-14 Fire warning system
WARNING: The 9 V battery must be replaced every two years (as part of the documented
maintenance) or any time it fails a pre-flight test - whichever occurs sooner.
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