Glideslope Gain Programming; Glideslope Capture (Gs Cap); Glideslope Track (Gs Track) - Honeywell SPZ-8000 Pilot's Manual

SPZ--8000 Digital Integrated Flight Control System

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 programming occurs at glideslope capture and is
controlled by a runway height estimator. The value estimated is a
function of glideslope capture, glideslope track, and middle marker. The
height is estimated at:
1500 feet at glideslope capture
D
300 feet at glideslope track and before the middle marker
D
100 feet at glideslope track and after the middle marker.
D

Glideslope Capture (GS CAP)

The following conditions are necessary for glideslope capture:
Glideslope mode is armed plus 3 seconds
D
The localizer mode is captured or in the track phase
D
Glideslope deviation is less than 2 dots
D
Either of the following conditions is satisfied:
D
— The VBS has been tripped
— Glideslope deviation is less than 1/4 dot.

Glideslope Track (GS TRACK)

Glideslope track occurs after the aircraft has captured the glideslope
and is tracking the beam. The track phase flies the beam tighter. The
following conditions are necessary for track mode:
Glideslope capture plus 15 seconds
D
Localizer has gone into track 1 or track 2
D
Glideslope deviation must be less than 1/2 dot
D
The vertical deviation must be changing at a rate of less than
D
10 feet/second
Radio altitude (RA) or height above the runway is less than 1550
D
feet.
System Limits
7-2
A28--1146--055
REV 2