Page 11-13
Pilot’s Operating Manual
Revision A1: Nov, 2002
Sub-section 11
ICE PROTECTION
Hawker 800XP Pro Line 21
Section III - SYSTEMS DESCRIPTION
PITOT, STATIC, RUDDER BIAS STRUT and AIRFLOW ANGLE SENSOR HEATING
Ice protection in the form of electrical heating is provided for the following:
• Two pitot heads, one located each side of the forward fuselage.
• Two forward static plates, one located each side of the nose section.
• Two rudder bias struts, connected to the rudder quadrant.
• Two airflow angle sensors, one located each side of the forward fuselage.
OPERATION
Each pitot head contains an electrical heating element controlled by a PITOT/VANE HEAT L or R ON-
OFF switch. Each switch also controls one element of a double element heating muff installed on each
of the two rudder bias struts.
L & R PITOT HTR FAIL annunciators illuminate with the MWS ICE PROT
repeater annunciator flashing
whenever a PITOT/VANE HEAT L or R switch is OFF, or when both switches are ON and the current
draw by either pitot head element is insufficient.
Annunciator dimming is via the MWS dimmer.
A single ammeter and a L-R selector switch are provided. Selecting L or R connects the ammeter to the
associated pitot head heater circuit. With PITOT/VANE HEAT switched ON for at least 1 minute,
readings of between 5 and 10 amps indicate satisfactory operation of the pitot heaters only. Actual
power consumption depends on the ambient temperature. The rudder bias heaters are not connected
to the ammeter.
The left and right forward static plates are electrically heated. The electrical power supply to the heating
element of each static plate is via a relay controlled by the PITOT/VANE HEAT R switch, and the weight
switch relay system. Heating is only available when the airplane is in flight.
Ice protection for each airflow angle sensor is provided by a vane heater element, and a case heater
element. The case heater element is thermostatically controlled.
The power supply to the heater elements is 115 VAC, and is derived as follows:
(1) Two windscreen alternators on line: left sensor elements from No. 1 alternator - right sensor
elements from No. 2 alternator.
(2) One windscreen alternator off line and No. 1 and No. 2 inverters on line: elements of both sensors
from No. 2 inverter.
(3) One windscreen alternator off line, and either No. 1 or No. 2 inverter off line: elements of both
sensors disconnected.
The heating elements of each airflow angle sensor are controlled by an associated PITOT/VANE HEAT
L or R switch.
A vane heater failure is indicated by the lighting of an associated L or R VANE HTR FAIL annunciator,
and the MWS ICE PROT repeater annunciator.
Содержание Hawker 800XP
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