For Training Purposes Only
Sept 04
2-35
P I L O T T R A I N I N G G U I D E
AUTOMATIC FLIGHT CONTROL SYSTEM
•
VASEL - Operates identical to ASEL mode. VASEL submode will arm as soon as
VFLC or VPTH is engaged
VASEL mode is canceled whenever VALT mode engages
•
VALT - Operates identical to ALT mode. VALT submode will engage
automatically when VASEL has captured the target altitude. VALT will also
engage whenever VNAV is activated via the VNAV switch on the guidance panel
and airplane is within 250 feet of VNAV target altitude
MULTI-AXIS MODES
Approach (LOC/GS, VAPP) Modes
The approach mode provides for automatic intercept, capture and tracking of the front
course localizer and glideslope signals which enables the pilot to fly a fully coupled
ILS approach. APR modes are based on vertical path deviation and valid glideslope on
the selected PFD. Review the Localizer section for further details.
When APR mode is armed and no FD is present at the time or in lateral ROL mode,
HDG is automatically active until localizer capture.
ILS
When the aircraft is within 75 nm flight plan distance or 30 nm direct distance, the ILS
will be automatically tuned. Additionally, the LOC preview mode will be
automatically set and the LOC preview course will be set to the localizer bearing.
These settings can still be overwritten by the crew.
ILS lateral/vertical capture and tracking is established, based on data from selected
PFD.
The lateral beam must be captured before the vertical beam in order to prevent
inadvertent descent.
LNAV
VALT
AP1
100
00
9500
10500
00
GX_02_038
100
00
80
20
