Piper ARCHER III Pilot Operating Handbook page 323

PA-28-181, ARCHER III
SECTION 3 - EMERGENCY PROCEDURES (continued)
Alternator Failure
Indication: Alternator Inop annunciator light illuminated and zero
current displayed on MFD alternator indication source.
Anytime the bus voltage is below 25 Vdc, the Low Bus
Voltage annunciator will be illuminated.
Verify Failure................................................................................Check ammeter
If ammeter shows zero:
ALTR switch ..................................................................................................OFF
Reduce electrical load to minimum:
ALTNR FIELD C/B ..........................................CHECK and RESET as required
ALTR Switch ..................................................................................................ON
Compass error may exceed 10 degrees with alternator
inoperative.
Any power interruption will result in loss of attitude
information from the PFD until the unit can be reinstated on
the ground.
Consider using the autopilot to reduce workload. Using the
GPSS mode can assist in maintaining a flight-planned route.
LO BUS VOLTAGE annunciator will be illuminated.
Anticipate complete electrical failure. Duration of battery
power available will be dependent on electrical load and
battery condition prior to failure.
ISSUED: JULY 12, 1995
REVISED: JANUARY 9, 2006
NOTE
WARNING
CAUTION
NOTE
NOTE
SECTION 9
SUPPLEMENT 20
REPORT: VB-1611
13 of 30, 9-121