Selkirk College IATPL Program Manual
Beech 95 POH
Effective September 1, 2005
Appendix 14 - 78
When amperage exceeds the values for which the circuit is designed an electric fire is
probable. Therefore pilots must never force circuit breakers in, or hold them in, under any
circumstance. If a circuit breaker pops out in flight it is best to leave it out unless the
circuit is absolutely necessary. If the circuit is necessary the CB may be reset ONCE and
only once. If it pops out a second time
do not reset it.
The Travelair also uses a selection of fused switches. These save cockpit space by
eliminating the need to have a separate CB as well as a switch. The fused switches have
an internal fuse that activates above the specified amperage turning the switch off and
disabling the switch from further use. The embossed number on the tip of the switch,
which specifies the rated amperage, distinguishes the fused switches from non-fused
switches. If the fuse in the fused switch activates the switch becomes spring loaded to the
off position, and so cannot be turned on again. Any attempt to hold the switch in the on
position could cause a fire.
Over-Voltage Warning
The D95A (GSAK) has one over voltage relay and one over-voltage light that illuminates
when the over-voltage relay activates. The relay senses system voltage through the circuit
that powers the light (see diagram on following page.) The over-voltage relay activates
when system voltage exceeds approximately 32 volts. The relay blocks the field current
from reaching the alternators. Once the relay is open the over-voltage light illuminates.
The E95 (FXFG) is equipped with voltage regulators that have built in over voltage
protection. When the over voltage circuit senses a system voltage above 32 it prevents
further output from the regulator thereby shutting down the electric system. There is no
over voltage light in the E95 electric system (see the E95 electric diagram below.)
Following an over voltage the pilot will notice that both alternators have stopped working
(see alternator out lights below.) A trouble shooting procedure in the emergency checklist
allows the pilot to diagnose whether the over voltage protection was activated, the
voltage regulator failed, or both alternators simultaneously failed.
Following activation of the over-voltage relay, on either model aircraft, both ammeters
will read zero and the electric system will be operating on battery power. The pilot should
follow the provided checklist.
Alternator Out Lights
The E95 (FXFG) is equipped with two alternator-out lights, which are activated by two
alternator-out relays, one for each alternator. The relays close automatically when the
corresponding alternator output is zero. Power for the alternator out lights is provided
through the alternator switches, consequently the lights will illuminate only if the
alternator out relay is closed and the alternator switch is on.
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