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Rev 3, Apr 25, 2005 Flight Crew Operating Manual Volume 2 CSP 700.5000.6 04.10.25
AUTOMATIC FLIGHT CONTROL SYSTEM
MODES OF OPERATION: (VERTICAL) (CONT'D)
Flight Level Change (FLC) Mode (Cont’d)
FMS IAS OR MACH SPEED BUG
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If preselect altitude is above the airplane’s present altitude and there is adequate thrust, FLC mode will climb at the speed reference until preselected altitude is captured. If thrust is inadequate, FLC mode will hold present airplane altitude until adequate thrust is applied.
If preselect altitude is below the airplane’s present altitude and thrust is appropriate, FLC mode will descend at the speed reference until preselected altitude is captured. If thrust is excessive, FLC mode will decelerate the airplane at its present altitude.
FGC pitch guidance will not generate commands to exceed Vmo or Mmo. When a potential overspeed condition exists, FLC will command a pitch maneuver to maintain a speed reference 3 knots less than Vmo or Mmo.
Volume 2 Flight Crew Operating Manual Rev 3, Apr 25, 2005
VNAV mode contains 4 vertical sub-modes 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. However, if the FD/AP active vertical mode is not a VNAV submode, the aural
Double C . chord
vertical track alert is inhibited.
VNAV mode is activated by selecting on guidance panel. The vertical mode active at the time
shall remain engaged.
FMS sub-mode selections when in VNAV mode are as follows:
.
VFLC . Operates identical to FLC mode, except that the target altitude from the FMS is used for climb or descent. The speed command is from the active displayed speed target (MAN or FMS) on the PFDs. VFLC will also engage if VALT is engaged and FMS initiates a climb or descent. Also if VALT or VPTH is engaged and FLC is selected on guidance
.
VPTH . Used to fly a fixed flight path 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.
A VNAV target altitude bug will appear on the altitude tape of selected PFD.
. VASEL. Operates identical to ASEL mode. VASEL sub-mode will arm as soon as VFLC or
VPTH is engaged.
VASEL mode is cancelled whenever VALT mode engages.
. VALT . Operates identical to ALT mode. VALT sub-mode will engage automatically when
VASEL has captured the target altitude.
VALT will also engage whenever VNAV is activated on guidance panel and airplane is
within 250 feet of VNAV target altitude.
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Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2
AUTOMATIC FLIGHT CONTROL SYSTEM
MULTI-AXIS MODES
The following are multi-axis modes of operation:
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