Selkirk College IATPL Program Manual
Beech 95 POH
Effective September 1, 2005
Appendix 14 - 76
and co-pilot air knobs as desired. Leave the heater switch in the off position. If on the
ground the electric switch can be place in the blower position.
The heater should be turned off for two minutes before landing so that it can cool down.
Alternatively the electric switch should be switched from Heat to Blower for two minutes
before turning the heater off (middle position of switch.)
Electric System
The electric system is direct current 24/28 volt electric system. There are two 50-amp
alternators and two 12-volt batteries connected in series to act as a single 24 volt 25 amp
hour battery.
The batteries are mounted below the nose baggage compartment. The alternators are belt
driven units attached to each engine.
Each airplane has two load meters (ammeters), one for each alternator. GSAK has a
single over-voltage light, and FXFG has two alternator-out lights, one for each alternator.
One voltage regulator that controls the field of both alternators maintains voltage in the
system. The aircraft are equipped with two voltage regulators and the pilot can choose
which one is activated with a switch on the pilot sub-panel. Normal practice is to
alternate use of the regulators to ensure that both remain serviceable. Flight with only one
serviceable voltage regulator is not prohibited, but eliminates the safety factor inherent in
a redundant electric system.
The voltage regulators draw current from the single circuit breaker labeled alternator field
Alternators, Voltage Regulators, and Ammeters
Each alternator has the capacity to provide 50 amps of electricity. The alternators deliver
power to the main bus through the two circuit breakers labeled left alternator and right
alternator respectively.
To protect the alternators from overheating do not use more than 45 amperes from either
alternator while operating on the ground at temperatures above 38 C or in flight at
altitudes above 14,000 feet with outside air temperature above 10 C.
The alternators are activated using the two switches on the ignition panel (see above.)
These switches take current provided by the voltage regulator and direct it to the chosen
alternator. On the E95 these switches also provide power to the alternator out lights
(explained below.)
The output from each alternator is displayed on the corresponding ammeter.
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