EXAMPLE
The amount of current shown on the ammeter is the load in amperes that is demanded by the electrical
system from the alternator. As a check, take for example a condition where the battery is demanding 10 amperes
charging current, then switch on the landing light. Note the value in amperes placarded on the circuit breaker
panel for the landing light circuit breaker (10amps) and multiply this by 80 percent. You will arrive at a current
of 8-amperes. This is the approximate current drawn by the light. Therefore, when the light is switched on there
will be an increase of current from 10 to 18 amperes displayed on the ammeter. As each unit of electrical
equipment is switched on, the current will add up and the total, including the battery, will appear on the ammeter.
—NOTE—
On airplanes without night flying equipment a simulated load can be
made by connecting 8 landing lights wired in parallel from the main bus
to airframe ground or fourteen 3 ohm, 100 watt resistors.
(See Figure 11-2.)
THIS SPACE INTENTIONALLY LEFT BLANK
PIPER AIRCRAFT
PA-28-161 CADET
AIRPLANE MAINTENANCE MANUAL
Issued: FEBRUARY. 28, 1989
ELECTRICAL SYSTEM
2C23