Page 11-3
Pilot’s Operating Manual
Revision A1: Nov, 2002
Sub-section 11
ICE PROTECTION
Hawker 800XP Pro Line 21
Section III - SYSTEMS DESCRIPTION
GENERAL
An airframe fluid ice protection system is provided for the leading edges of the wings and the horizontal
stabilizers. The system is controlled by a single timer switch. An audio warning is given when the system
switches off. Location of components in the vestibule area is shown in Figure 2.
Hot air is used to keep the main engine air intake and starter/generator cooling air intake free of ice with
electric heating provided for windscreens, pitot heads, forward static plates and stall vanes, rudder bias
struts and engine inlet temperature and pressure sensors Pt
2
and Tt
2
.
SYSTEM OPERATION
A WING/TAIL ANTICE timer switch controls an electrically-operated pump for up to 10 minutes. When
initially selected, the first minute of operation is at a high flow rate, after which, the system reverts to
normal flow. If icing conditions still prevail or are expected, and therefore a further period of operation
is required, this should be selected before the timer switch reaches zero.
Using this procedure the system will remain on the normal flow rate, without first delivering a high rate
flow and therefore fluid will be conserved. When the timer switch returns to zero, the pump is de-
energized and a warning chime sounds via the airplane audio system.
NOTE: At very low temperatures (-28° C or less) ice crystals can exist in the atmosphere, but do not
present a hazard. If the airframe ice protection system is used at these low temperatures, the
water/alcohol content of the fluid will evaporate, leaving solidified glycol which together with
the impinging ice crystals can give the appearance of ice. Use of the airframe ice protection
system, under these conditions, is not advisable.
Therefore, operation of the WING/TAIL ANTICE timer switch should be limited to the priming
procedures, and additional use in flight only when weather conditions warrant.
MINS
10
0
ANTICE
LO PRESS
ANTICE
LO QTY
ICE
PROT
MWS Panel
Overhead Roof Panel
Содержание Hawker 800XP
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