Vor Capture; Vor Over Station Sensor (Oss); Vor After Over Station Sensor (Aoss) - Honeywell PRIMUS 1000 Pilot's Manual

R
PRIMUS 1000 Integrated Avionics System

VOR CAPTURE

VOR capture occurs when the following conditions are met:
D
The VOR mode has been armed plus 1 second of elapsed time
D
The lateral beam sensor has tripped.

VOR OVER STATION SENSOR (OSS)

The over station sensor detects the erratic radio signal encountered in
the area above the VOR transmitter. When these radio signals reach
a certain level of deviation, they are no longer useful and the over
station sensor eliminates them from the control signal.
Over station sensor is computed differently depending on DME status.
D
With DME valid:
— A 30° VOR station zone of confusion is assumed and calculated,
using barometric altitude for VOR navigation
— During VOR approach, the formula computes the zone with radio
altitude.
NOTE: If the radio altimeter is invalid, the computer assumes a
2500 foot altitude for VOR approach computations.
D
With DME invalid:
— VOR NOC has occurred +4 seconds of time for VOR approach
or 20 seconds for VOR NAV
— The DME estimate is less than 10.1 NM, and the rate of deviation
is greater than 0.5° per second.

VOR AFTER OVER STATION SENSOR (AOSS)

During the period when neither the over station sensor control nor NOC
control functions are operational, the system operates in after over
station sensor. AOSS permits large bank angles so that a larger course
correction can be made before NOC controls the aircraft.
System Limits
5-4
A28–1146–134
REV 1 Jan/03