PIPER AIRCRAFT, INC.
PA-28-161, WARRIOR III
MAINTENANCE MANUAL
2E9
24-30-00
PAGE 17
Nov 30/06
C. Inspection
(1) 100 Hour Standby Alternator Inspection
Each 100 Hours, or at each annual inspection, whichever comes first, inspect the standby
alternator installation as follows:
(a) Standby Alternator (BC410)
1 Inspect security and condition of standby alternator mounting and wiring.
2 Perform a normal preflight inspection
3 Move the aircraft to an area safe for engine start.
4 Perform a normal engine start and allow the engine to reach proper temperature for
runup RPM
5 Assure that the standby alternator "Field" and "Sense" circuit breakers and the
"Standby Alt" master are in the on position.
6
Reduce system electrical loads to approx. 10-15 amps.
7
Set engine to 2000 RPM minimum.
8 Switch primary alternator field switch to OFF.
9 Check that the "Stby Alt On" annunciator lights.
10
Increase the electrical load to over 20 amps. The "Stby Alt On" annunciator should be
blinking. Reduce the electrical load to less than 20 Amps. The "Stby Alt On"
annunciator should be ON steadily.
11
Switch primary alternator field switch to ON and verify primary alternator operation.
The "Stby Alt On" annunciator should be OFF.
12 Return the engine to idle RPM.
(b) Standby Alternator Regulator (BC203-3D)
1
Inspect security and condition of the case mounting bolts and wiring.
2
Inspect overvoltage protection by performing Overvoltage Test, below.
D. Set Point Voltage Check
Voltage adjustment of the BC203-2D is not normally required. Deviation from the factory set point of
26.0 volts by more than 0.2 volts may indicate the need for repair or replacement. This set point
voltage can be checked as follows:
(1) Connect a calibrated digital voltmeter directly between terminals 1 and 7 of the regulator.
(2) Ensure the airplane is in a suitable area and start the engine.
(3) Running the engine at over 2000 RPM and with a total bus load of under 3 amps, the voltmeter
should indicate 26.0 ± 0.2 volts.
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