F2000EX EASY
02-22-10
CODDE 1
PAGE 11 / 22
DGT94085
ATA 22 – AUTO FLIGHT
DESCRIPTION
ISSUE 3
DASSAULT AVIATION Proprietary Data
Altitude mode
Altitude mode (ALT) is selected manually by pressing the ALT pushbutton on the GP and
a green ON light is displayed, or automatically after capture of a Pre-selected Altitude
(ASEL). The AP if engaged will capture and hold the altitude. The FMA displays the
green ALT indication and the reference altitude along with the corresponding bug on the
altitude tape. Airplane response in ALT mode is limited to +/- 0.1 g or +/- 20° pitch angle.
FIGURE 02-22-10-15 ALT MODE
When active, ALT mode can be disengaged automatically by AFCS logic (e.g. Glide
Slope capture) or manually by pressing the ALT pushbutton.
Preset Altitude mode
Preset Altitude mode (ASEL) is automatically armed as soon as:
-
a pre-selected altitude has been set, either manually (ASEL) or automatically
through the FMS (VASEL) using a VNAV mode,
-
the airplane is climbing / descending towards the pre-selected altitude.
The reference pre-selected altitude value (or FL value when BARO setting is STD) is
displayed on the readout above the ASEL setting knob (1,000 feet or 100 feet
increments). This reference value and associated bug are also displayed on the FMA, on
top of the altitude tape. Depending on the selection made on the HSI menu, the ASEL
unit can be either ft or m.
When the AP has been engaged in normal conditions (except with active VGP or G/S
modes: in these cases, ASEL is ignored), it will capture and hold the reference with a
minimization overshoot:
-
during climb, the capture phase is initiated when the pre-selected altitude is within
2,000 ft (0.8 g max) of current airplane altitude,
-
during descent, the capture phase is initiated when the pre-selected altitude is within
10,000 ft (1.2 g max) of current airplane altitude.
If the current flight path is diverging from the ASEL reference or if the selected mode is
incompatible with ASEL logic, a CHECK ASEL message will be displayed on the FMA.
