APP (LOC & GS), BC
and VOR APP modes
Loss of the navigation receiver valid for more
than 4 seconds will cause the mode to disengage.
When both HSI SEL arrows are illuminated
(indicating that both receivers are being used
simultaneously) a loss of the nav receiver valid
will not disengage the mode. The AFCS will
continue to fly the approach using the re-
maining good receiver. A loss of the second
receiver will cause the mode to disengage.
Unflagged Failures
AHRS
Upon loss of valid data from both AHRS or
upon a disagreement (split) between the data
from the two AHRS, the autopilot and yaw
damper will disengage.
It is possible to have valid AHRS data dis-
played on the primary instruments and not
have valid data to the AFCS since separate
data paths are used. Dual AHRS data failures
will cancel all Flight Director modes.
Digital Air Data Computer (DADC)
Upon loss of valid data from both DADC's or
upon a disagreement (split) in the data from
the two DADC's, the AFCS will disengage. It
is possible to have valid altitude and altitude
alerter functions on the panel instruments and
not have valid data to the AFCS since separate
data paths are used. Dual DADC data failures
will cancel VS, FLC, ALT, and ALT SEL flight
director modes.
Comparator Monitors
AHRS
If the pitch or roll attitude from the two AHRS
differ by 6 degrees and both AHRS are valid,
the AFCS will cancel the FD mode and dis-
engage the AP and YD.
DADC
The data from the two DADC's are compared
in the same manner as the AHRS data. Un-
flagged differences between the data cause
the AP and YD to disengage. The flight di-
rector modes are retained.
GS and LOC Deviation
The two navigation receivers are compared
in the AFCS during Dual HSI Approach. If the
localizer or glideslope do not compare, the
AFCS selects a receiver based upon the mag-
nitude and polarity of the two signals. The
HSI SEL arrow associated with that failed re-
ceiver will be extinguished, identifying that the
system is no longer in the DUAL HSI mode.
If the two receivers once again agree, the sys-
tem will again use both receivers and the
DUAL HSI mode will again become active.
AP AND YD ENGAGE STATUS
Any change in the status of the engagement of
either the yaw damper or the autopilot will be
annunciated. if either the AP or YD pushbut-
tons are depressed, the system will illuminate
the appropriate arrow on the GC-810. If the
AP or YD are disengaged due to a fault in the
AFCS the “AP DISC” disengage lights will
stay on. A single push of the AP disconnect but-
ton on the control wheel will reset the lights.
MODE ANNUNCIATION
All AFCS mode annunciation is displayed on
the EADI's directly in front of each pilot.
Armed modes are annunciated in white active
modes are annunciated in green. Transition
from an armed mode to an active mode is em-
phasized by flashing the green annunciation
for 5 seconds.
Revision 1
16A-12
FOR TRAINING PURPOSES ONLY
HAWKER 800 XP
PILOT TRAINING MANUAL
FlightSafety
international
Содержание 800 XP
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