Searey LSA – Pilot’s Operating Handbook Version 5.0, Revision 8
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instrument panel avionics and all electric aircraft accessories and devices
will be fed power through their respective circuit breakers.
b. Fault? Check all circuit breakers and any power switches of individual
components. There is also a 130 a. fuse link at the positive battery
terminal that protects the whole electric system in case of a major short
circuit anywhere. If this is blown, it must be replaced.
c. Most circuit breakers are within the VP-X power controller. They, as well
as individual circuit breakers, should all be checked before flight.
d. Fault? Do not reset unless the aircraft is on the ground.
7.4.1.4 Ignition/Start Switch
The ignition/start switch controls these circuits that are independent of the
main power circuit so engine restart in flight is possible if master power is
lost. The “start” position of the switch applies power to the start relay that
engages the electric engine starter. After engine start, the switch should
be set to the “run” position. The “right” and “left” switch positions allow
testing the two independent ignition systems prior to takeoff.
Fault? If the Battery lamp is on but the engine does not turn over, the
possible faults could be (a) a bad start switch, (b) a bad start relay, a bad
starter motor or any connecting wires. There are no circuit breakers in
this circuit with the exception of the 125 a. fuse link.
7.4.1.5 Alternator Power and Overvoltage
After engine start, power from the alternator will be available and can be
switched into the aircraft electric system using the Alternator (left) half of
the red Master Switch. Current flows through the 30 a. Alternator
Breaker. If an over-voltage (OV) condition occurs at the output of the
voltage rectifier/regulator, the over-voltage relay will cause the alternator
feed to be interrupted until the over-voltage condition is removed.
Fault? An alternator circuit fault may be determined if after the engine is
turning above 2000 RPM the battery current indicator in the engine
management system (EMS) in the electronic flight information system
(EFIS) unit, does not show the battery charging. The aircraft should not
be flown in this condition and maintenance should be performed to
determine the problem and mitigate it.
7.4.1.6 12 v. Accessory Jack
The accessory jack supplies 12 v. battery voltage for low power devises
such as a cell phone charger, iPad power or audio entertainment device.
The circuit is protected by the 2 a. circuit breaker.
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