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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.
LATERAL NAVIGATION MODES
Lateral navigation mode is activated by selecting the NAV button on the guidance panel
. The following navigation sources may be activated:
.
Very high frequency Omni-directional Range (VOR).
.
Localizer (LOC).
.
FMS Lateral Navigation (LNAV) .
When any NAV mode is armed, HDG is automatically active.
HDG will be de-activated when NAV mode is active.
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 re-tuned flag.
.
To-From flag.
.
Distance to station (DME) and tuned-to-NAV flag.
.
Radio altitude.
Volume 2 Flight Crew Operating Manual Rev 3, Apr 25, 2005
Very High Frequency Omni-Directional 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 intersept angle is less than 60°. 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.
FD roll commands are limited to ± 24° when in VOR capture and roll rate commands are 5.5°/sec. When VOR track is active, FD roll commands are ± 14° and roll rate commands 4°/sec.
If selected VOR is re-tuned to another VOR frequency while in VOR capture, track or over station, VOR mode cancels and re-arms automatically.
When the airplane is passing over the VOR transmitter (cone of confusion), VOR mode will fly towards selected course reference (over-station passage). If selected course is unchanged prior to entry into cone of confusion, previously computed wind correction is applied and VOR mode will not command a turn towards selected course pointer. Changes of course pointer setting when over-station will cause a change in course hold reference.
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