Pilot’s Operating Handbook Section 7
EXTRA 500 Description of Airplane and Systems
92 %. At 78 % N1 about 10 A are available. Below 70 % N1 the
standby alternator isn’t able to provide a relevant current.
Note During flight the standby alternator switch must be ON to
be on standby.
Operation of the standby alternator is indicated by a yellow
STANDBY ALTERN ON caution light on the annunciator panel.
Continuous illumination of this light signals operation below
the 20 A output limitation.
Important If the yellow STANDBY ALTERN ON light on annunciator
panel starts blinking, the load on the alternator exceeds its
rated capacity and the pilot must reduce consumption of
electrical consumers within 5 minutes to 20 A or less.
7.18.c Battery
The 24 V DC/28 Ah valve regulated lead acid battery is located
in the engine compartment, mounted to the pressure bulkhead
and protected by a vented aluminum case. Normally the battery
is connected to the battery bus.
The battery supplies power to the electrical system when
BATT
switch is switched to
ON position.
In case of combined generator and alternator failure the battery
is able to supply the essential loads for at least 30 min when
following the emergency procedures given in section 3 of the
POH.
7.18.d External Power
An external power receptacle is installed under an access door
on the right side of the engine compartment. The use of external
power is recommended for engine starting in case aircraft
battery is weak, for ground operation of the vapor cycle air
condition system or for any prolonged ground operation of
aircraft systems. An external power source being connected
with the external power receptacle and switched on will be
indicated by a green EXTERNAL POWER annunciation light in
the annunciator panel. To enable the external power source to
supply power to the aircraft the
EXT PWR switch on the MAIN
section of the left side panel has to be switched on.
26. January 2011 7-51
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