Systematic Process for Building a Fault Diagnoser Based on Petri Nets Applied to a Helicopter

Table 5

Thresholds for monitored signals of the UAV.

Variable	Symbol	V. Normal ()	V. Fault ()
Temperature		(ambient) to 90°C	>90°C
Voltage		6.5–7 V	<6 V
Fuel flow		100–500 mL	<50 mL
RPMs	RPM	1200–1500 rpm	<1200 rpm
Vibrations		0.5–2.5 g	>2.5 g
Servos current		100–600 mA	>600 mA
Roll/pitch angles		< 45°	>45 degrees