Section 7 Pilot’s Operating Handbook
Description of Airplane and Systems EXTRA 500
7.26 Icing Equipment
Note Flight into known or forecasted icing conditions is
prohibited.
The aircraft is equipped with the following ice protection
devices:
1 Pneumatic wing and empennage de-ice boots,
2 electrothermal propeller de-ice pads,
3 electrothermal windshield panel de-icing,
4 heated lift detector (stall warning),
5 heated pitot head and static sources,
6 heated engine air inlet.
7.26.a Pneumatic Wing and Empennage De-Icing
Important A margin of 10 KIAS has to be added to normal stall speed
when flying with activated de-ice system.
Aircraft wing and empennage ice protection consists of the
pneumatic de-ice boots for the wing, the horizontal stabilizer
and the vertical fin. The system is activated by the
BOOTS
switch, located on the left cockpit side panel and has the
positions
ON and OFF.
Two bleed air operated ejector flow valves provide pressure or
vacuum for the operation of the de-ice system. One ejector flow
valve supplies the inboard wing de-ice boots, a second the
outboard wing and the empennage de-ice boots.
Sufficient operation pressure of the system is indicated by
illumination a green DEICE BOOTS advisory light on the
annunciator panel, if the
BOOTS switch is ON and the boots
timer is supplying pressure to the boots.
If the
BOOTS switch is set to OFF position, vacuum is applied
to the boots to maintain the de-ice boots in a flat, non-inflated
position.
Activation of the de-icing system causes a timer switch, which
controls the ejector flow valves, to cycle the system in two
separate sequences.
First, the inboard wing de-icing boots are inflated for
approximately six (6) seconds; thereafter the outboard wing and
7-68 26. January 2011
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