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Heading select mode is selected by pushing the HDG switch on the flight control
panel. Heading select mode is cleared by pushing HDG switch or by selecting
another lateral mode.
Heading select mode is annunciated with a green HDG message in the lateral
capture field.
(4) 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.
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.
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 steering information is invalidated when the navigation source is not
a localizer.
(5) Roll Mode
Roll mode generates commands to hold the heading that exists when the mode is
initiated, unless the roll angle upon initiation is over 5 degrees (commands are
then generated to hold the roll angle). The roll mode reference is reset to the
current heading, or current roll angle, upon autopilot engagement or
synchronization.
Roll mode is automatically selected, when no other lateral mode is active, and the
flight director is on. Roll mode is cleared by the selection of another lateral mode.
Vol. 1 03--20--11
AUTOMATIC FLIGHT CONTROL SYSTEM
Flight Control and Guidance REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Roll mode is annunciated with a green ROLL message in the lateral capture field
on the primary flight display.
(6) Half Bank Mode
Half bank mode reduces the maximum commanded bank angle to 15 degrees.
Half bank mode is selected by pushing the 1/2 BANK switch on the flight control
panel. Half bank mode is automatically selected when climbing through 31,600
feet (pressure altitude) or if the airplane 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.
(7) Lateral Go-Around Mode
Lateral go-around mode generates a heading hold command, with a 5 degree
bank limit. Selection of lateral go-aroundmode turns on both flight directors,
disengages the autopilot, and clears all other lateral modes. Lateral and vertical
go-around mode selections are coincident. When lateral go-around causes an
autopilot disengage, the resultant autopilot disengage warning may be cancelled
by another push of a TOGA switch, or by pushing the AP disconnect switch.
Lateral go-around mode is selected by pushing one of the thrust lever-mounted
TOGA switches while airborne. Lateral go-around mode is cleared by selection of
synchronization or another lateral mode.
Lateral go-around is annunciated with a green GA message in the lateral capture
field on the primary flight display.
(8) Approach Mode
Approach mode generates commands to capture and track the selected
navigation source displayed on the primary flight display. Tracking performance
is higher, than in navigation mode. Approach mode is armed when selected, but
cannot capture if the flight control computer is not receiving valid navigation data.
The capture point is a function of closure rate, with the capture point moving
away from the radial/beam for high closure rates.
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.
Vol. 1 03--20--12
AUTOMATIC FLIGHT CONTROL SYSTEM
Flight Control and Guidance REV 3, May 03/05
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