This unit is for use in the construction of Permit aircraft to provide three electrical functions usually required to improve the safety monitoring of the aircraft's engine systems.
It provides :-
a) A warning indication of the aircraft battery state and is set to give an alarm if the generator cannot maintain the battery voltage between the limits 12.5 to 15.9 volts. A low voltage is signified by a continuous red light and a high voltage by the light flashing.
b) A warning indication when the starter motor is energised or is engaged and is being driven by the engine.
c) A fuel flow warning. This can be energised in two ways depending on the sensor provided. For the EUROPA and other low wing aircraft, a fuel pressure switch type GL502 provides a warning if the fuel pressure falls below 0.25 Bar. For the KITFOX a fuel level unit type GL503 provides an indication if the fuel level starts to drop in the header tank.
The unit utilises 6 volt low current long life bulbs which are operated at constant brightness irrespective of battery state and should have an MTBF in excess of 20,000 Hours.