Electrical Failures (Alternator Supplement) - Piper PA-24-250 COMANCHE Pilot Operating Handbook

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Piper Comanche 250 (Early Model)
ELECTRICAL FAILURES
(Supplement for an Aircraft Modified With an Alternator)
Section
-
3
Emergency
Procedures
Ammeter ..............................
. .
....................................................... Indicates Battery Discharge
Reduce electrical loads to a minimum.
Alternator Main Circuit Breaker .....................
. .
............................. Remove Guard
-
Check On
Alternator Field Circuit Breaker ...................
. .
............................. Check and Reset as Required
**
CAUTION
**
The alternator main circuit breaker should never be operated when the engine is running except in
an emergency. The alternator main circuit breaker can be operated safely only when the engine is
stopped, the master switch is off, or the 5 ampere field circuit breaker is open.
**
NOTE
**
Before attempting to reset any circuit breaker, allow for a two to five minute cooling off period,
and reset only once.
If circuit breakers are reset (closed):
Master Switch .......................
. .
...................................................................................... Off
Wait a minimum of 6 seconds for overvoltage relay to reset.
Master Switch .....................
. . . . . .
...................................................................................... On
If alternator returns on line (ammeter indicates battery charging):
Reinstate electrical load.
If alternator output cannot be restored:
Maintain minimum electrical load and land as soon as practical
**
NOTE
**
The battery is the only remaining source of power.
If the battery is depleted: Land without flaps. (VAPP
=
95 mph or 83 kt)
Initiate Manual Gear Extension procedure @ Part 3. p a g e 3-8)
Copyright:
1993
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