P I L O T T R A I N I N G G U I D E
AUTOMATIC FLIGHT CONTROL SYSTEM
2-36
For Training Purposes Only
Sept 04
Tracking performance for glideslope mode is within ± 1 dot from 700 to 100 feet
(radio altimeter).
ASEL is inhibited during glideslope capture.
During a CAT 2 approach, EFIS will monitor for excessive deviation from the beam
and will provide appropriate annunciation. The outputs provided by AFCS (used by
EFIS) in the determination of CAT 2 status are glideslope arm or capture and dual
couple status. A valid CAT 2 status is indicated on the PFD. A CAT 2 window also
appears to display deviation from the beam. The fully coupled (dual arrow) ILS
approach becomes active when the aircraft is below 1200 feet AGL.
VOR Approach (VAPP) Mode
The APR button must be selected in order to get VAPP mode. With flaps other than
zero, the FGC sets bank limits and rate limits to ensure proper gain control and
performance from VOR capture through the approach profile, to landing. FD roll
commands are ± 30° during VOR approach capture and roll rate commands 7°/sec.
When track phase is active, FD commands are ± 14° and roll rate commands 4°/sec.
