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The capture point is a function of closure rate, with the capture point moving
away from the radial/beam for high closure rates. Capture will always occur if
VOR deviation is less than 5% of full scale (0.1 dot), or localizer deviation is less
than 30% (0.6 dot). If the other side does not concurrently capture, it will
continue to operate in heading select until it independently captures.
Approach mode may automatically select glideslope mode. An on-side localizer
capture clears turbulence mode on both sides.
Dead reckoning is provided during VOR station passage. When DME data is
available, dead reckoning region is where DME distance to the station is less than
0.6 nautical mile (DME). Without DME data, dead reckoning is based on a high
rate of VOR deviation.
The CRS 1 knob is used to set the course pointer on the pilot’s PFD. The CRS 2
knob is used to set the course pointer on the copilot’s PFD. Pushing the button
in the course knob will select the course required to fly directly to a station.
Approach mode is selected by pushing the APPR switch on the FCP. Approach
mode is cleared by pushing the APPR switch again, by selecting another lateral
mode, or by changing the source of the on-side navigation signal.
Vol. 1 03--20--11
REV 56, Jan 31/03
AUTOMATIC FLIGHT CONTROL SYSTEM
Flight Control and Guidance
Flight Crew Operating Manual
CSP A--013
MASTER
Approach mode arming is annunciated with two messages on the primary flight
display, a green HDG message in the lateral capture field, and a white navigation
source identifier (VOR1/2, LOC1/2 or FMS1/2) in the lateral arm field. Approach
mode capture/tracking is annunciated with a green message in the lateral capture
field on the primary flight display which identifies the navigation source (VOR1/2,
LOC1/2 or FMS1/2). Dead reckoning operation is annunciated with a white DR
message on the primary flight display.
(6) Back Course Mode
Back course mode generates commands to capture and track the selected back
course displayed on the primary flight display. Back course is armed when
selected, but cannot capture if the flight control computer is not receiving valid
localizer data.
The capture point is a function of closure rate, with the capture point moving
away from the radial/beam for high closure rates. Back course capture clears
turbulence, half bank and heading modes. The CRS 1 knob is used to select the
pilot’s course, the CRS 2 knob is used to for the copilot’s course, both displayed
on the PFD’s.
Back course mode is selected by pushing the B/C switch on the flight control
panel. Back course mode is cleared by pushing the B/C switch again, by
selecting another lateral mode, or by changing the source of the navigation signal
to something other than a localizer.
NOTE
In FD mode with B/C selected, the localizer deviation
is in the correct direction either on the front or on the
back course. <0026>
Back course mode arming is annunciated with two messages on the primary
flight display, a green HDG message in the lateral capture field, and a white
navigation source identifier (B/C 1/2) in the lateral arm field. Back course mode
capture/tracking is annunciated with a green message in the lateral capture field
on the primary flight display which identifies the navigation source (B/C 1/2).
Back course captures are cleared, and/or prevented, in an FCC when the flight
director on its side of the aircraft is driven by flight guidance commands from the
other FCC.
Back course steering information is invalidated when the navigation source is not
a localizer.
(7) Half Bank Mode
Half bank mode reduces the maximum commanded bank angle to 15 degrees.
The automatic mode transition will occur at 31,600 feet. Half bank mode has no
effect on roll mode operation.
REV 56, Jan 31/03
Vol. 1 03--20--12
AUTOMATIC FLIGHT CONTROL SYSTEM
Flight Control and Guidance
Flight Crew Operating Manual MASTER
CSP A--013
Half bank mode is selected by pushing the 1/2 BANK switch on the FCP. Half
bank mode is automatically selected when climbing through 31,600 feet (pressure
altitude) or if the aircraft is above the half bank transition altitude when the flight
director is turned on. Selection is inhibited when in the take-off mode, go-around
mode, on-side approach mode capture, or any on-side localizer capture.
Half bank mode is manually cleared by pushing the 1/2 BANK switch again, and
is automatically cleared when descending through the half bank transition
altitude.
Half bank is annunciated with a white 1/2 BNK message on the primary flight
display.
　
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