Pilot’s Operating Handbook Section 8
EXTRA 500 Handling, Servicing and Maintenance
Fuel samples taken immediately after refueling may not show
water or sediment due to mixing action of refueling process.
Allow fuel approximately five (5) minutes to settle down after
refueling so that possible water and/or sediments can settle
down in tank sump before taking fuel samples.
Warning Take fuel samples with care. Water remaining in the sump
could ice and clog the fuel lines.
Draining
To collect a fuel sample, push upward the drain valve by means
of the plastic cup to open the valve momentarily and drain fuel
into the cup. If water and fuel in the cup, a distinct line
separating the water from the fuel will be seen through the
transparent cup wall.
Water, being heavier, will settle to the bottom of the cup, while
the colored fuel will remain on the top.
If water was detected, continue taking fuel samples until all
water is purged from the tank
When during draining of the outer wing tank drains, wing sump
drains or gascolator drains water has been detected, perform the
following draining procedure:
1 Verify the aircraft static pitch angle, using the spirit level
installed on the upper edge of the lower door.
2 If the reference line is horizontal, all water present in the tank
has been drained from the outer wing sump drains.
3 If the reference line was larger than 1° nose down or 2° nose up,
bring the aircraft in a horizontal pitch position using the spirit
level. After approximately 30 minutes, start draining at wing
and sump drains.
When during draining of the drains in the lower wing skin, the
wing sump drains, the lower fuel line drain or the fuel filter
drain, water has been detected, perform the following draining
procedure:
1 Adjust airplane attitude to:
- longitudinal (pitch angle) has to be horizontal (check with
spirit level installed on the upper edge of the lower door)
- lateral (bank angle): bank airplane to one side so as the lower
wing tip is at least 0,3m (1’) lower than the other tip.
26. January 2011 8-9
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