References
and performance
At power up, the digital readout for the ALTA reference will be displayed as
dashes (invalid) until the ALT SEL knob is moved at least one click.
When ALTA mode is engaged:
• a vertical speed of either +1000 fpm or –750 fpm in the direction of the target
altitude is automatically set
• IAS mode is automatically engaged holding the current airspeed (60 KIAS
minimum)
The ALTA mode vertical speed reference is displayed as a set bug and as a digital
readout on the PFD.
The vertical speed reference for the ALTA mode can be changed by the pilot using
one of the following means:
• setting either pilot or copilot collective Beep Trim CLTV/YAW switches to
UP (to increase VS) or DN (to reduce VS) (Beep rate: ±150 fpm/s)
• pressing the collective FTR switch while flying to the desired vertical
speed, and then releasing the FTR.
The VS mode reference can be set in the range of –1500 fpm to +2000 fpm.
The minimum vertical speed reference is 100 fpm in the direction of the target
altitude.
Changing the altitude preselect reference while ALTA is engaged, will cause the
mode to attempt to capture the new reference once the altitude preselect knob is
released.
As the aircraft approaches and captures the pre-selected altitude, the ALTA
mode automatically transitions to the ALT mode and IAS mode remains engaged.