Honeywell SPZ-8000 - Glideslope Gain Programming; True Airspeed (TAS) Gain Programmer; PFD Command Bars or Cue; Vor Oss

3. B.
(2) (c)
(d)
(e)
(f)
Honeywell
In the back course (BC)
selected.
MAINTENANCE
MANUAL
GULFSTREAMIV
mode, the VBS
is locked out when BC is
When capturing from above the beam, the aircraft must be
descending at a rate that
will create a suitable intercept
angle.
Glideslope Gain Programming
Gain programming starts after the VBS trips. The gain is
programmed as a function of radio altitude and vertical speed.
If the radio altimeter is invalid, gain progrannningoccurs at
GS capture and is controlled by a runway height estimator. The
value estimated is a function of GS capture, GS track, and
middle marker.
At GS capture, the height is estimated at 1500
feet.
At GS track and middle marker not passed, the height is
250 feet.
At GS track and middle marker passed, the height is
100 feet.
If the DADC is not valid, vertical speed is a
preprogrammed fixed rate.
True Airspeed (TAS) Gain Programmer
TAS gain programming is used to program heading select error,
course select error, pitch wheel command, air data commands,
and glideslope deviation to achieve approximately the same
aircraft response regardless of the aircraft’s airspeed and
altitude. The TAS computation is derived from airspeed,
altitude, and outside air temperature.
PFD Command Bars or Cue
When a command signal is applied to the bar or cue input, the
bar will move left or right (roll) or up or down (pitch) and
the cue will move CW orCCW (roll) or up or down (pitch). This
provides the required visual command to allow the pilot to
maneuver the aircraft in the proper direction to reach the
desired flightpath.
If the information required to fly the desired flightpath
becomes invalid, the command bar or cue is biased from view.
VOR 0SS
The over station sensor (0SS) is used to detect the erratic
radio signals encountered in the area above the VOR
transmitter.
When these radio signals reach a certain level of
deviation, they no longer are useful and the 0SS eliminates
them from the control signal.
22-14-00
Page 298.44
Aug 15/91
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