Hawker 800 XP, Pilot Training Manual

Page: 431 / 504

submode, the “VOR” message is flashed for 5 sec-
onds. When the system comes out of the over sta-
tion submode, the system is again in a capture
mode to allow a capture of a new outbound course
if selected. The VOR mode may be cancelled by
depressing the NAV pushbutton.
VAPP (VOR Approach) Mode
This mode is entered when the navigation re-
ceiver is tuned to a VOR frequency , the VOR nav
source has been selected for display, the APP
pushbutton is pushed, and the beam deviation is
below the capture threshold of approximately
175 millivolts. operation of this mode is identi-
cal to the VOR mode with the exception that the
“VAPP” message is displayed.
The VAPP mode may be cancelled by de-
pressing the APP pushbutton.
Localizer
This mode is entered when the navigation re-
ceiver is tuned to a localizer frequency, the
LOC nav source has been selected for display,
the NAV pushbutton is depressed, and the
beam deviation is below the capture threshold
of approximately 175 millivolts (two dots
equals 150 millivolts). If Heading Select mode
is not engaged at the time that NAV is se-
lected, the Heading Select mode will auto-
matically be engaged. Prior to capture the
“LOC” mode is annunciated in white on the
EADI. Upon capture the LOC mode is an-
nunciated in green and the white message is
cleared. The green “LOC” is flashed for 5 sec-
onds to emphasize the transition. The LOC
mode may .be cancelled by depressing the
NAV pushbutton.
Glideslope
This mode is entered when the LOC nav source
has been selected for display, a localizer fre-
quency has been tuned on the nav receiver, the
APP pushbutton is depressed, and beam de-
viation is below the capture threshold. The
capture threshold varies as a function of the
rate of closure onto beam center. The faster the
closure rate, the farther out the capture point.
Selection of APP automatically selects the
LOC mode. Prior to capture, the armed "GS"
mode is annunciated in white. Upon capture
the white message is cleared and the "GS"
mode is annunciated in green. The green "GS"
is flashed for 5 seconds to emphasize the tran-
sition. The GS mode may be cancelled by de-
pressing the NAV or APP pushbutton.
DUAL HSI — When both the LOC and GS are
on track and the radio altitude is less than
1200 feet and both nav receivers are tuned to
the same ILS and valid, the AFCS will tran-
sition to the Dual HSI mode. When this mode
is active, both HSI SEL arrows are illumi-
nated and the green —> is replaced by < — >
on the EADI's. In this mode both flight guid-
ance channels are using information from both
navigation receivers. This allows the approach
to be continued in the event of a failure of one
nav receiver. Should one receiver fail, the
arrow associated with that receiver will ex-
tinguish and the mode will remain active.
LOC PREVIEW — While flying LNAV mode;
with the navigation receiver tuned to a local-
izer frequency; the first push of the V/L push-
button on the EFIS controller will activate the
LOC PREVIEW mode. At this time pushing
the APP pushbutton will arm the LOC and GS
modes. The LNAV mode will remain active
until the localizer deviation is within the cap-
ture threshold. At this time the EHSI will re-
vert to the normal presentation of the short
range navigation information and the LNAV
mode will cancel.
BC (Back Course Localizer)
Operation of this mode is identical to that of
the LOC mode with the exception that the BC
pushbutton and "BC" mode messages are used.
The BC mode does not allow use of a simul-
taneous GS mode.
The BC mode may be cancelled by depress-
ing the BC pushbutton or by selecting the NAV
(LOC) mode.
16A-7
FOR TRAINING PURPOSES ONLY
HAWKER 800 XP PILOT TRAINING MANUAL
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