Pilot’s Operating Handbook Section 8
EXTRA 500 Handling, Servicing and Maintenance
8.5 Servicing
8.5.a Fuel System Servicing
Warning: If the fuel system has been completely drained, the fuel
system bleeding procedure must be performed, see
maintenance manual. If the fuel system is not free of air, an
engine flame out may be the result.
Important: To prevent lateral fuel unbalance, make sure the left and
right collector and main compartments are full before filling
any auxiliary compartment. Maximum permissible fuel
unbalance in flight is 106 liter (one auxiliary tank).
Important Before filling the tanks, connect grounding wire with
aircraft structure. Ensure the aircraft is in level before
refueling.
Note For fuel capacities, fuel grades and types, refer to Section 2
of this handbook.
The tanks of the aircraft should be gravity refueled when
aircraft is in ground level.
The tanks are considered full, when fuel completely covers the
bottom of the standpipe.
After refueling check that fuel filler caps are tight and secured.
Warning Be sure that a fire extinguishing equipment is available. Do
not operate radios or other electric equipment during
refueling.
When refueling is completed, fit the fuel filer caps and
disconnect the grounding wire from aircraft.
Check the fuel tank vent for clogging before the first flight of
the day. The vents are located at the rear underside of each wing
in the near of the wing flap gap.
Comment on fuel sampling: there are twelve drains to be
checked for water. Five per wing side and two under the plane,
one just behind the nose L/G doors and the fuel filter drain, just
in front of the nose L/G doors.
Fuel samples from the two drains of each tank and from the
gascolator drain should be taken before the first flight of the day
to check for water, sediment or other contamination. The fuel
26. January 2011 8-7
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