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the localizer is not captured, or if the flight control computer is not receiving valid
glideslope data. Upon glideslope capture, other vertical modes are automatically
cleared on the captured side. If the other side does not concurrently capture the
glideslope, it will continue to operate in the current active vertical mode, or
ensuing vertical mode, until it independently captures glideslope.
Climb or descent rate is achieved by moving the rotary switch on the flight control
panel.
(7) Glideslope Mode
Glideslope mode will generate commands to capture and track the glideslope.
Captures can be performed from above or below the beam.
The capture point is a function of closure rate, with the capture point moving
away from the beam for high closure rates.
Glideslope mode is automatically selected when in an approach mode, inbound,
with a valid localizer as the lateral navigation source. Glideslope mode is
automatically cleared by the loss of approach mode. When armed, glideslope
mode is also cleared by turning outbound, or by the loss of a valid localizer as the
lateral navigation source. When captured, glideslope mode is cleared by
changing the source of the lateral navigation signal to an invalid localizer.
Vol. 1 03--20--16
AUTOMATIC FLIGHT CONTROL SYSTEM
Flight Control and Guidance REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Glideslope arming is annunciated with a white GS message in the vertical arm
field on the primary flight display. Glideslope capture is annunciated with a green
GS message in the vertical capture field on the primary flight display.
(8) Vertical Go-Around Mode
Go-around mode generates a fixed pitch-up command, the value depending on
whether both engines are operating or if one engine is inoperative (OEI).
Selection of vertical go-aroundmode turns on both flight directors, disengages
the autopilot, clears all other vertical modes and switches the flight guidance
commands to a dual-independent configuration. Vertical and lateral modes
coincide.
When a go-around causes the autopilot to disengage, the autopilot warning can
be cancelled by another push to the TOGA switch, or by pushing the autopilot
disconnect switch.
Vertical go-around mode is selected by pushing either one of the thrust
lever-mounted TOGA switches while airborne. Go-around mode is cleared by
engaging the autopilot, by selecting synchronization or by the selection or
capture of another active mode. Go-around mode is annunciated with a green
GA message in the vertical capture field on the primary flight display.
F. Altitude Alert System
The primary flight displays alert the pilots that the aircraft is approaching the
preselected altitude, or that the aircraft is deviating from a previously selected and
acquired altitude. Altitude advisories are indicated on the primary flight displays in the
following locations: on the altimeter portion, at the preselect altitude digital readout
(above the barometric tape), and at the preselect bugs,including the double bars
(across the fine and coarse tapes).
The altitude alert system processes data from the air data computers and is
independent of the autopilot or flight director mode. The ALT knob on the flight control
panel is used to set the desired altitude.
The preselect digital readout and bugs change state and colour as follows:
S At the altitude alert threshold, the readout and bugs flash magenta for approximately
four seconds, and a one-second aural tone sounds. The threshold is approximately
1,000 feet from the selected altitude.
S When within 200 feet from the selected altitude, the readout and bugs come on
steady to indicate altitude capture.
S If the airplane subsequently deviates more than 200 feet from the selected altitude,
the readout and altitude bugs (double bars) will flash amber and a 1 second tone will
be heard. The readout and altitude bugs will continue to flash amber as long as the
aircraft is deviated more than 200 feet or cancelled.
Vol. 1 03--20--17
AUTOMATIC FLIGHT CONTROL SYSTEM
Flight Control and Guidance REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
S When the aircraft is --200 feet below the selected altitude the flashing magenta bugs
and readout will cancel.
S If the aircraft subsequently continues to deviate (±1000 feet) from the selected
altitude, a 1 second tone will be heard.
S When the aircraft is again within 200 feet of the selected altitude, the readout and
bugs will turn magenta and stop flashing.
Altitude alerts can be cancelled by pushing the ALT switch or selecting a different
altitude. Altitude alerts are inhibited if the glideslope is captured.
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