Glide-Slope Intercept & Tracking - S-TEC Meggitt System 55X Operating Handbook

The selected heading will now be flown until the autopilot computes that
an on course turn must be made to minimize overshoot at the point of
intercept. At the time the on course turn begins, the HDG Mode will
extinguish.
NOTE:
4.3.7 Glide-slope Intercept and Tracking (Software Version 4 and
below)
To arm the automatic glide-slope (GS) capture function, the following
conditions must be met:
a. NAV receiver must be tuned to the appropriate frequency.
b. Glide-slope signal must be valid - no flag.
c. Autopilot must be in NAV / APR / ALT Modes.
d. Aircraft must be 60% or more below GS centerline during the approach
to the intercept point, and within 50% needle deviation of the localizer
centerline at the point of intercept - usually the Outer Maker.
Glide-slope arming will occur when the above conditions have existed
for 10 seconds. Illumination of the GS annunciator will occur, indicating
arming has been accomplished. The ALT annunciator remains on.
Glide-slope capture is indicated by extinguishing of the ALT
annunciation.
2nd Ed: May 31, 2002
Intercept angles greater than 45
some course overshoot, depending on the distance
from the station and aircraft speed. Therefore, angles
!
greater than 45
!
usually result in
are not recommend.
SYS FIFTY FIVE X POH
4-27