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NOTE
When ASEL is the active (green) vertical mode, and the ALT
preselector has not been changed, selection of any other vertical
modes other than GS is inhibited.
Attempting to select any vertical mode on the guidance panel
while ASEL is active, the ASEL annunciation on the PFDs shall
flash for five seconds to indicate acknowledgement of the button
press.
While ASEL is active, preselecting the next altitude will enable all
vertical modes.
ALT
GX_02_036
23500
30000
Preselect
Altitude
Altitude
Preselect
Knob
P I LOT T R A I N I N G GU I D E
AUTOMATIC FLIGHT CONTROL SYSTEM
2-34 For Training Purposes Only
Sept 04
Altitude Hold (ALT) Mode
ALT mode is used to maintain a barometric altitude reference.
ALT mode is activated automatically following preselect altitude capture (ASEL), or
can be activated manually via the altitude switch (ALT) on the guidance panel to
maintain a pressure altitude at time of selection.
If the ALT mode is selected when the airplane is in a climb or descent, FGC will
generate pitch commands to zero the vertical speed and capture the selected altitude.
The pilot may select another altitude reference without canceling ALT mode by
depressing the TCS button, and maneuvering the airplane to a new altitude.
The ALT mode will use a baro-corrected altitude and respond to baro knob changes to
airplane pitch angle up to ± 20° limit.
ALT mode is annunciated in the vertical capture field on the PFD. ALT will flash for 5
seconds, when active.
Vertical Navigation (VNAV) Modes
VNAV mode contains 4 vertical submodes that can be flown using speed and altitude
targets, that are programmed in the active flight plan of the FMS.
A double C-chord (aural) is activated for VNAV vertical track alerts.
VNAV mode is activated by selecting VNAV on the guidance panel. The vertical
mode active at the time shall remain engaged.
FMS submode selections when in VNAV mode are as follows:
• VFLC - Operates identical to FLC mode, except that the target airspeed and
altitude from the FMS are used for climb or descent. If VALT or VPTH is engaged
and FLC is selected on the guidance panel, VFLC will become active
• VPTH - Used to fly a fixed flightpath angle to a vertical waypoint during descent.
VPTH will engage whenever FMS initiates a path descent which may occur while
in VFLC or VALT modes. LNAV must be the lateral navigation mode for VPTH to
capture
A VNAV target altitude bug will appear on the altitude tape of selected PFD
9500 10400
9500
10500
00
Selected
Altitude Bug
VNAV
Target Altitude
Altitude
Trend Vector
VNAV Target
Altitude Bug
GX_02_037
2992 IN
9500
Vertical Speed
Target Readout
VS 1000
10000
80
20
For Training Purposes Only
Sept 04
2-35
P I LOT T R A I N I N G GU 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 AP1 VALT 10000
9500
10500
00
GX_02_038
10000
80
20
P I LOT T R A I N I N G GU I D E
AUTOMATIC FLIGHT CONTROL SYSTEM
2-36 For Training Purposes Only
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