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Vertical Speed Mode
The vertical speed mode (VS) generates commands to maintain a vertical speed reference value.
Pushing the VS button on the FCP selects the vertical speed mode. A green VS annunciation is displayed in the active vertical field of the FMA, the selected vertical speed value is displayed in cyan, and ALTS mode is automatically armed to capture the preselected altitude.
The VS reference value will default to the existing vertical speed at the moment of mode selection. The VS reference value will also reset to the existing vertical speed whenever the autopilot is engaged and VS mode is active.
AUTOMATIC FLIGHT CONTROL SYSTEM Description Vol. 2 04.10.39
Oct 05/06
The VS reference may be changed by rotating the VS/pitch wheel in the desired direction. The VS reference changes by ±100 fpm per click. The selected vertical speed reference is displayed on the vertical speed scale as a cyan triangular bug, and as a cyan digital readout with an up/down arrow right of the VS indication in the FMA.
The pilot may adjust the VS reference by pushing the FD SYNC button while maneuvering the airplane to a new VS reference. The FD will generate commands to maintain the new VS reference upon release of the FD SYNC button.
Vertical speed mode is cleared by:
.
Pushing the VS button on the FCP;
.
Selecting another vertical mode; or
.
Capturing an armed vertical mode.
Vertical Speed Mode Figure 04.10.32
Flight Level Change Mode
Flight level change mode (FLC) generates commands to maintain either the airspeed/Mach reference value, or a 100 ft/min vertical speed toward the preselected altitude, whichever yields the greater closure rate to the preselected altitude.
Pushing the FLC button selects flight level change mode. A green FLC annunciation is displayed in the active vertical field of the FMA, and ALTS is automatically armed to capture the preselected altitude.
When FLC mode is selected manually, or by the FMS, the airspeed/Mach reference displayed on the PFDs (speed bug) is automatically set to the aircraft’s current airspeed/Mach. The airspeed/Mach reference is also synchronized to the aircraft’s current airspeed/Mach when the autopilot is engaged with the active vertical mode in FLC. The airspeed/Mach reference can be manually adjusted using the SPEED knob on the FCP, and is displayed in cyan next to the FLC mode annunciation.
Automatic transition between IAS and Mach airspeed reference occurs at 33,600 feet MSL. Mach reference automatically selects when the airplane climbs through 33,600 feet MSL, and IAS reference automatically selects when the airplane descends through 33,600 feet MSL.
AUTOMATIC FLIGHT CONTROL SYSTEM Description Vol. 2 04.10.40
Oct 05/06
FLC mode is cleared by:
.
Pushing the FLC button;
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