SPZ--8000 Digital Integrated Flight Control System
A28--1146--055
REV 2
7-5
System Limits
Vertical Beam Sensor (VBS)
The VBS determines the point of glideslope capture using a number of
inputs. The VBS is armed when NAV radio is tuned to a LOC frequency,
the LOC receiver is valid, and the LBS has tripped. The VBS trips as
a function of vertical speed, TAS, and glideslope deviation. The VBS
trips when vertical deviation is less than 2 dots and a capture sensor is
satisfied. The capture sensor combines airspeed, rate of beam
deviation change, and acceleration to determine the optimum capture
point. If the aircraft is paralleling the beam, i.e., no beam closure rate,
the VBS trips at a vertical deviation less than 1/4 dot. This resets the
previously selected pitch mode and changes aircraft attitude to capture
the glideslope beam.
VOR Capture (VOR CAP)
VOR capture occurs when the following conditions are satisfied:
D The VOR mode has been armed plus 3 seconds
D The LBS has been tripped.
VOR Track
VOR track occurs as the aircraft is established on beam center and the
following conditions are satisfied:
D The VOR mode has been captured or AOSS 2 has occurred
D Elapsed time of 30 seconds from capture
D Lateral deviation rate is less than 50 feet/second, roll rate less than
0.5_/second, and the aircraft bank angle is less than 6_.
At this time course error is eliminated from the command signal, leaving
beam deviation and lateral acceleration from the AHRS/IRS to maintain
the aircraft on beam center. There is no visual indication in the cockpit
that the VOR track submode has occurred.
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