Piper SEMINOLE PA-44-180 Information Manual page 63

PA-44-180, SEMINOLE
3.5n Electrical Failures (3.33) (Continued)
DUAL ALTERNATOR FAILURE (Zero Amps Both Ammeters or
Alternator Inop. Light Illuminated - Annunciator Panel). (3.33b)
Anytime total tie bus voltage is below approx-
imately 12.5 Vdc, the LO BUS voltage annun-
ciator will illuminate.
Verify failure .............................................................CHECK AMMETERS
Electrical Load.......................................................REDUCE to MINIMUM
Alternator Switches ................................................................................OFF
Alternator Circuit Breakers ..........................................CHECK and RESET
Alternator Switches (One at a time
after OFF at least 1 second) ..............................................................ON
If only one alternator resets:
Operating Alternator Switch ....................................................................ON
Failed Alternator Switch.........................................................................OFF
Electrical Load ....................................... MAINTAIN LESS than 60 AMPS
Ammeter......................................................................................MONITOR
If neither alternator resets:
Both Alternator Switches........................................................................OFF
Continue flight with reduced electrical load on battery power only.
LO BUS voltage annunciator will also be
illuminated.
Land as soon as practical. 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
EMERGENCY PROCEDURES
NOTE
REQUIRED FOR SAFE FLIGHT
NOTE
SECTION 3
AS REQUIRED
REPORT: VB-1616
3-17