Piper ARCHER III - Page 367

SECTION 9
PA-28-181, ARCHER III SUPPLEMENT 23
ISSUED: JULY 12, 1995 REPORT: VB-1611
REVISED: FEBRUARY 14, 2006 13 of 36, 9-165
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.
NOTE
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
and/or low bus annunciator is extinguished
NOTE
If the STBY ALTR ON annunciator is flashing then reduce
electrical loads until the annunciator no longer flashes.
NOTE
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.
SECTION 9
PA-28-181, ARCHER III SUPPLEMENT 23
ISSUED: JULY 12, 1995 REPORT: VB-1611
REVISED: FEBRUARY 14, 2006 13 of 36, 9-165
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.
NOTE
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
and/or low bus annunciator is extinguished
NOTE
If the STBY ALTR ON annunciator is flashing then reduce
electrical loads until the annunciator no longer flashes.
NOTE
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.