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is activated.
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 5 seconds to indicate acknowledgement of the button press.
While ASEL is active, preselecting the next altitude will enable selection of FLC or VS mode.
Altitude Hold (ALT) Mode
ALT mode is used to maintain a barometric altitude reference.
ALT mode is activated automatically following preselect altitude capture, or can be activated
manually via
on the guidance panel to maintain a barometric altitude at time of selection.
Volume 2 Flight Crew Operating Manual Rev 3, Apr 25, 2005
Altitude Hold (ALT) Mode (Cont’d)
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 cancelling 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.
will flash for 5 seconds, when active.
Flight Level Change (FLC) Mode
FLC mode is used to climb or descend to a new altitude reference, while maintaining an Indicated Airspeed, or Mach reference. FLC mode is selected via flight level change switch on the guidance panel and is automatically active. FLC is cleared when another armed vertical mode is capture.
FLC mode is selected on guidance panel and is automatically active.
FLC is cleared when another armed vertical mode is captured.
FGC will generate pitch commands to capture and track the speed reference displayed on the selected PFD. To obtain Mach readout, Mach must be greater or equal to 0.40 M.
Automatic transfer from IAS to Mach speed reference will occur in climb, above 32,400 feet. Automatic transfer by pushing the SPD PUSH CHG button. There is no auto transfer between IAS and Mach in MAN speed.
MAN speed selection is accomplished by selecting MAN on the outer knob and turning the inner knob on the SPD button. A cyan airspeed bug will follow the commands from the inner knob and is located on the airspeed tape of the selected PFD. Manual transfer from IAS to Mach speed reference can be accomplished by pushing the SPD PUSH CHG button.
Outer Knob
When rotated, sets speed on
BUG airspeed tape (MAN mode).
When rotated, enables MAN mode or FMS mode of airspeed reference.
Inner Knob
AIRSPEED
FMS speed selection is programmed in the active flight plan in the FMS. A magenta speed bug will appear on the airspeed tape of both PFDs.
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