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FIELD
LATERAL ARMED
FIELD
LATERAL CAPTURE
OR ACTIVE FIELD
VERTICAL CAPTURE
OR ACTIVE FIELD
<0015>
D. Lateral Modes of Operation
(1) 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, FD SYNC or
AP SYNC.
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--9
REV 56, Jan 31/03
AUTOMATIC FLIGHT CONTROL SYSTEM
Flight Control and Guidance
Flight Crew Operating Manual
CSP A--013
MASTER
Roll mode is annunciated with a green ROLL message in the lateral capture field
on the primary flight display.
(2) Lateral Take-Off Mode
Lateral take-off mode generates a wings level command while on the ground.
After take-off, it generates a heading hold command, with a 5-degree bank limit,
using the heading which existed at take-off. Selecting a lateral take-off mode
turns on both flight directors, disengages the autopilot and clears all other lateral
modes.
Lateral take-off mode is selected by pushing one of the thrust lever-mounted
TOGA switches while on the ground. Lateral take-off mode is cleared by the
selection of FD SYNC or another lateral mode.
Lateral take-off mode is annunciated with a green TO message in the lateral
capture field on the primary flight display.
(3) Heading Select Mode
Heading select mode generates commands to capture and maintain the selected
digital heading readout and heading bug on the PFD. The selected heading can
be changed by rotating the HDG knob (up to 360 degrees) on the flight control
panel (FCP). Pushing the HDG knob will set the selected heading to the current
heading.
Heading select mode is selected by pushing the HDG switch on the FCP.
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) Navigation Mode
Navigation mode generates commands to capture and track a selected
navigation source displayed on the primary flight display. Navigation 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. 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). Navigation capture clears the heading selected. A localizer
capture clears half bank and turbulence modes.
Dead reckoning is provided during VOR station passage. When DME data is
available, dead reckoning region is approximately where the horizontal distance
to the station is less than the altitude to the station. Without DME data, dead
reckoning is based on a high rate of VOR deviation.
REV 56, Jan 31/03
Vol. 1 03--20--10
AUTOMATIC FLIGHT CONTROL SYSTEM
Flight Control and Guidance
Flight Crew Operating Manual MASTER
CSP A--013
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.
Navigation mode is selected by pushing the NAV switch on the FCP. Navigation
mode is cleared by pushing the NAV switch again, by selecting another lateral
mode or by changing the source of the on-side navigation signal.
Navigation 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.
Navigation 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.
(5) 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.
　
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