EMERGENCY PROCEDURES
Emergency
In the event of Autopilot malfunction:
The SPZ-8000 system is a fully monitored au-
topilot and will disengage without a signifi-
c a n t a t t i t u d e o r h e a d i n g c h a n g e i f a
malfunction should occur.
The pilot may disengage the autopilot by:
1. Press (momentarily) the AP/YD disen-
gage button on the pilot's or co-pilot's
control yoke.
2. Press (momentarily) the AP or YD button
on the Guidance Controller.
3. Open the Autopilot circuit breakers.
In the event of an engine failure:
1. Disengage the autopilot/yaw damper, re-
trim the airplane and re-engage the Yaw
Damper and Autopilot as desired.
2. Before any significant power changes dur-
ing single engine operation, disengage the
Autopilot and Yaw Damper, retrim the air-
craft as required and re-engage the Au-
topilot and Yaw Damper as desired.
Maximum Altitude Losses during malfunc-
tion test were:
Altitude loss was not appreciable during mal-
functions during all phases of flight, including
climb, cruise, descent and coupled approaches.
ATTITUDE & HEADING
REFERENCE SYSTEM
(AHZ-600)
DESCRIPTION AND
OPERATION
The dual AHRS installation is approved as
the primary attitude and heading reference
source. Several operational modes are pro-
vided for continued availability of attitude
and heading in the event of certain system
failures. The standard system consists of dual
attitude and heading reference units, dual
AHRS controllers and dual flux valves (Fig-
ure 16A-3, Figure 16A-4, and Figure 16A-5).
Pitch, roll and heading are provided to the
Electronic Flight Instrument System (EFIS)
and the Automatic Flight Control System
(AFCS). Attitude and heading data is dup-
plied to other aircraft systems such as the
weather radar antenna, RMI's and flight con-
trol system.
The AHZ-600 AHRS is an all attitude inertial
sensor system that differs from conventional
vertical directional gyro systems in that the gy-
roscopic elements are rate gyros which are
strapped down to the principal aircraft axes.
It has no gimbals. The spinning mass follows
the airframe and its output signals are rate
sensitive. A digital computer contained in the
AHZ-600 mathematically integrates the rate
data to obtain heading, pitch and roll. A flux
valve and three accelerometers provide long
term references for the system.
The “DG” mode disables the automatic slav-
ing of the heading outputs. Entry into this
mode can only be achieved by momentarily
pressing the HDG/DG pushbutton on the
AHRS controller. Entry into the DG mode oc-
curs when the pushbutton is released and is
confirmed by the DG 1 (DG 2) annunciation
on the EHSI display. AHRS operation in the
“DG” mode results in a heading system which
is similar to a free directional gyro, and which
Revision 1
16A-14
FOR TRAINING PURPOSES ONLY
HAWKER 800 XP
PILOT TRAINING MANUAL
FlightSafety
international
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