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3.
B.
(8)
(c)
F1ight Level Change (FLCH) Mode and VNAV F1ight Level Change
(VFLCH) Mode (See Figure 260, sheet 3.)
Activation of the FLCH pushbutton on the GP-820 Flight Guidance
Controller selects the flight level change mode and overrides
all active pitch F/D modes.
The FLCH mode will fly to the
speed target which is displayed on the PFD and in the GP-820
speed window.
Activation of the VNAV arm and FLCH pushbuttons on the GP-820
Flight Guidance Controller selects the VNAV flight level change
mode and overrides all active pitch F/D modes.
The VFLCH mode
may also be selected automatically by the FMS. The VFLCH mode
will fly to the speed target which is displayed on the PFD and
in the GP-820 speed window.
The speed target is GP-820 switch selectable by the pilot to be
either IAS or Mach and automatic or manual. Automatic speed is
supplied by the FMS and manual speed is set by the pilot with
the GP-820 speed knob.
The airspeed target display on the GP-820 Flight Guidance
Controller functions in automatic and manual (speed
intervention) modes as follows:
. Automatic Mode - The displayed speed target is input from
the selected FMS which also controls the IAS/Mach display
format.
. Manual Mode - Manual mode (speed intervention) is selectable
via the SPD pushbutton on the GP-820. The IAS/Mach display
format will not change when this mode is selected, but the
speed target will be synched to present speed.
In this
mode, the SPD button will be annunciated (MAN), and the
target display format will toggle selectable via the
IAS/Mach changeover pushbutton. Alterations of the target
are accomplished via the speed-set knob inputs. Continuity
of speed shall be maintained when toggling between IAS and
Mach targets, via the changeover button.
The PFD annunciates Mach or IAS (FLCH), orVMACH or VIAS
(VFLCH), and the GP-820 SPD switch annunciates MAN when in the
manual mode.
Before using the FLCH or VFLCH mode, the desired
altitude is set with a knob on the GP-820 and it is displayed
in the GP-820 altitude window.
When autothrottles are engaged, they provide proper power
management for the desired altitude and airspeed change.
Without autothrottles, the pilot provides the power control.
22-14-00
Page 298.111
Aug 15/91
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