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The heading select mode is activated via the HDG button on the guidance panel. The heading
select mode is automatically activated whenever a navigation ( NAV) mode, approach (APR) mode
or back course (BC) is armed. While in HDG mode, all armed roll flight director modes are
available, but a capture of any armed roll mode will cancel the heading select mode.
HDG
Active. “HDG” will flash for approximately 5 seconds, when active.
GF0410_035
HDG Switch:
When selected, activates
heading mode.
HDG Knob:
Turn to set the heading
bug on the HSI.
PUSH SYNC:
Used to synchronize heading
bug to present heading.
20 20
10 10
10 10
20 20
HDG AP2 FLC
VOR
29.92 IN
NAV HDG BANK
BC
APR
HDG
PUSH SYNC
HDG
PUSH SYNC
AUTOMATIC FLIGHT CONTROL SYSTEM
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
04−10−13
MODES OF OPERATION: (LATERAL) (CONT'D)
Heading Select (HDG) Mode (Cont’d)
If the heading bug is turned through more than 180° but less than 360° (airborne), the FGC will
follow the bug all the way around to the target and not turn in the shortest arc. The FGC provides
guidance to the selected target using the shortest arc when on the ground. The onground
logic
will prevent the airplane from turning in the wrong direction following takeoff,
due to maneuvering
the airplane may have done on the ground.
The roll rate commanded by the heading mode is limited to 4°/sec. If the roll angle is less than or
equal to 6° when ascending through an altitude of 35,050 feet, the FGC shall automatically
transition to the low bank limit of 17°. If the roll angle is greater than 6°, an automatic bank limit
transition will not occur until the roll angle is reduced to less than or equal to 6°.
When descending through 34,950 feet, the bank limit shall revert to the high bank limit of 27°, if the
roll angle is less than or equal to 6°. If the roll angle is greater than 6°, high bank limit reversion will
not occur until the roll angle is reduced to less than or equal to 6°.
The bank angle can also be toggled between high and low bank limits by means of the BANK
switch on the guidance panel.
When heading select mode is active with the low bank limit, an “eyebrow” is displayed between
±17° on top of the attitude sphere on the PFD.
BANK Switch:
Used to limit bank
angle.
"EYEBROW"
GF0410_036
0.88 AP1 300 00
20 20
220
210
23500
HDG FLC
NAV HDG BANK
BC
APR
HDG
PUSH SYNC
LATERAL NAVIGATION MODES
Lateral navigation mode is activated by selecting the NAV button on the guidance panel NAV . The
following navigation sources may be activated:
· Very high frequency Omnidirectional
Range (VOR).
· Localizer (LOC).
· FMS Lateral Navigation (LNAV) .
When any NAV mode is armed, HDG is automatically active.
HDG
LOC
HDG will be deactivated
when NAV mode is active.
LOC
Lateral navigation guidance and automatic transitions are computed based on the following data,
received from the selected PFD:
· Lateral path deviation (VOR and LOC).
· Course or heading error.
· NAV source identification (VOR, LOC, FMS).
· VOR radio frequency retuned
flag.
· ToFrom
flag.
· Distance to station (DME) and tunedtoNAV
flag.
· Radio altitude.
AUTOMATIC FLIGHT CONTROL SYSTEM
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
04−10−14
LATERAL NAVIGATION MODES (CONT'D)
Very High Frequency OmniDirectional
Range (VOR) Mode
VOR mode provides for automatic intercept, capture and tracking of a selected VOR radial.
If Distance Measuring Equipment (DME) information is not available, the FGC estimates a
distance of 30 NM. If an Inertial Reference System (IRS) is installed and in NAV mode, the
distance estimate is updated based on ground speed and track error. If IRS navigation information
is not available, the estimate is updated based on true airspeed and course error.
Capture and tracking will occur, provided that:
· The optimum intercept angle should be less than 45°. If greater than 45°, course cut limiting
may occur to limit steering commands to 45° which forces flight path to get to radial sooner
to prevent overshooting beam center, and
· the bank angles required do not exceed the roll limits.
　
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