ALPHA Electro
www.pipistrel-aircraft.com
REV. 0
POH-167-00-40-150
3-6
Emergency procedures
Motor, power controller and battery temperatures are influenced mostly by two factors: ambient
temperature and power setting. The pilot has direct control of the power setting and thus affects
the powertrain component temperatures. Avoid high power setting for long periods, especially in
a hot environments (80-85 °F/26-30 °C and higher). Flight speed also has influence on cooling, as it
increases airflow through the cooler.
Automatic power reduction
Exceeding normal operating temperatures must be avoided as it may lead to automatic power re-
duction and eventual power cut off.
POWER CONTROLLER
Linear power reduction is applied above 65 °C, up to 68 °C, reduced by 30 kW every °C of tempera-
ture increase. Power is cut off when the temperature exceeds 68 °C. Overtemperature of the power
controller is critical, as the power cut off temperature is reached very quickly. Power controller over-
temperature is indicated by “DRIVE OVERTEMPERATURE” warning message. The actual temperature
value is visible on the bar-type indicator.
Special care shall be taken not to allow the temperature of the power controller to exceed 60°C (cau-
tion range).
Should the temperature of the power controller reach 60 °C during cruise flight operations or maneu-
vering, reduce power immediately to a cruise power setting of maximum 25 kW and place the aircraft
in level flight until the power controller cools below 55 °C. The aircraft can climb at 25 kW at maximum
MTOM, but rate of climb is very low.
No take-off shall be initiated if the power controller temperature is 55 °C or higher. However, if the
power controller reaches 60 °C during take-off, power should be immediately reduced to 40 kW and
climb angle reduced to increase forward speed to 70 kts to increase cooling. The flight shall be ter-
minated as soon as practical and measures taken to ensure the power controller temperature stays
below 60 °C.
MOTOR
Linear power reduction is applied above 90 °C of motor temperature, up to 110 °C, where power is
reduced to zero. Motor overtempertature is indicated by “DRIVE OVERTEMPERATURE” warning mes-
sage. The actual temperature value is visible on the bar-type indicator.
BATTERY
Battery overtemperature is indicated by “BATTERY 1/2 OVERTEMPERATURE” caution message on the
EPSI570 display and power is cut when batteries reach 60 °C.
Reduce power to 35 kW or less if one battery is disconnected, monitor temperatures and SOC of the
functional battery and land as soon as practical.
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