Piper ARCHER III Pilot Operating Handbook page 367

PA-28-181, ARCHER III
SECTION 3 - EMERGENCY PROCEDURES (continued)
ALTERNATOR FAILURE
Failure of Primary Alternator
Indication: Alternator Inop annunciator light illuminated and Standby
Alternator ON annunciator light illuminated or zero current
displayed on MFD alternator indication source.
Anytime the bus voltage is below 25 Vdc, the Low Bus
Voltage annunciator will be illuminated.
STBY ALTR ..............................................Verify ON/check ammeter indication
Engine RPM ........................................................Increase to a minimum of 2500
Electrical Load ....................................Reduce until total load is below 20 amps
If the STBY ALTR ON annunciator is flashing then reduce
electrical loads until the annunciator no longer flashes.
Certain flight maneuvers such as climbs and lower power
settings will result in an engine RPM less than 2500. Flight
conditions resulting in less than 2500 engine RPM will
reduce the standby alternator system capability and possibly
require load shedding to maintain a system voltage above 25
volts.
ALTR ..............................................................................................................OFF
ALTR FIELD circuit breaker ....................................check and reset as required
ALTR................................................................................................................ON
If primary alternator power not restored:
ALTR ..............................................................................................................OFF
If primary alternator output cannot be restored, maintain an electrical load of less
than 20 amps with which the STBY ALTR ON annunciator no longer flashes and
land as soon as practical.
ISSUED: JULY 12, 1995
REVISED: FEBRUARY 14, 2006
NOTE
and/or low bus annunciator is extinguished
NOTE
NOTE
SECTION 9
SUPPLEMENT 23
REPORT: VB-1611
13 of 36, 9-165