CESSNA AIRCRAFT COMPANY FOR TRAINING USE ONLY
MODEL 152 3-14
battery would overheat and evaporate the electrolyte at an excessive rate. Electronic components in
the electrical system could be adversely affected by higher than normal voltage if a faulty voltage
regulator setting is causing the overcharging. To preclude these possibilities, an over-voltage sensor will
automatically shut down the alternator and the over-voltage warning light will illuminate if the charge
voltage reaches approximately 31.5 volts. Assuming that the malfunction was only momentary, an
attempt should be made to reactivate the alternator system. To do this, turn both sides of the master
switch off and then on again. If the problem no longer exists, normal alternator charging will resume
and the warning light will go off. If the light illuminates again, a malfunction is confirmed. In this event,
the flight should be terminated and/or the current drain on the battery minimized because the battery
can supply the electrical system for only a limited period of time. If the emergency occurs at night,
power must be conserved for later use of the landing light and flaps during landing.
INSUFFICIENT RATE OF CHARGE
If the ammeter indicates a continuous discharge rate in flight, the alternator is not supplying power to
the system and should be shut down since the alternator field circuit may be placing an unnecessary
load on the system. All nonessential equipment should be turned off and the flight terminated as soon
as practical.
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