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flight plan waypoints. The list includes all flight plan waypoints
starting with the first waypoint ahead of the aircraft. Other flight plan
waypoints (ahead of the FMS present position) may be displayed by
pressing the NEXT and PREV keys.
RETURN [5R] - Pressing this line select key will return the display to
the previous page with no changes.
The VNAV page will display the vertical speeds required based on
present groundspeed to obtain the target altitudes at the VNAV
waypoints. Two minutes prior to Top of Descent a "2 MIN TO TOP
OF DESCENT" message will become active on the message page.
At 15 seconds to Top of Descent or any other VNAV waypoint the
WPT annunciator will flash and a "VNAV WPT ALERT” message will
be displayed on the message page. The WPT alert annunciator will
remain illuminated until vertical leg sequencing occurs. If lateral and
vertical waypoints are colocated, the WPT alert annunciator will
flash, as vertical waypoints take precedence over lateral waypoints.
Aircraft deviation from the vertical flight path is output to the flight
guidance system glideslope deviation pointer. The glideslope
pointer is driven to a scale of 750 feet per dot for analog instruments
and, normally, 200 feet per dot on Collins C-14 and Compatible EFIS
instruments.
Section V
Operations
5-68 2423sv602
Change 1
NOTE: The VNAV function and outputs to the glideslope deviation
pointer are advisory only and may not be coupled to the
autopilot, except in installations with compatible autopilots.
VNAV mode will be canceled under any of the following conditions:
• ADC altitude becomes invalid.
• ADC altitude is not baro-corrected below 18,000 feet.
• ADC is deselected.
• A manual altitude is entered
• POSITION UNCERTAIN message appears.
• Selected Crosstrack Mode is activated.
• Cancel VNAV line select key is activated.
• Crosstrack deviation becomes greater than 12.5 nm.
• Enroute FPL gap is encountered.
• Enroute/Approach VNAV waypoint gap is encountered.
If any of these occur prior to entering a VNAV leg, the VNAV page
will not be canceled and the VNAV data on the page may be used
for planning purposes.
Activating the approach mode, landing the aircraft (as determined by
the air/ground sensor), or entering the number "99" as a vertical
waypoint will cancel the VNAV mode and will delete the VNAV flight
path.
Upon reaching the target VNAV altitude, the target altitude is
automatically filled into the subsequent waypoint provided no other
vertical navigation is programmed into the flight plan (including
vertical guidance in a destination approach). If the target altitude is
not filled into the subsequent waypoint, VNAV is canceled and the
FGS will revert to pitch hold mode.
Section V
Operations
2423sv602 5-69
Change 1
VNAV Flight Path Definition Procedure
NOTE: A Flight Plan must already be active, as flight plan
waypoints are used to define the VNAV waypoints.
1. Press the VNAV function key. The VNAV Cruise page is
displayed, and all entry fields are prefilled with the current fight
plan waypoints.
2. Press the TO line select key to define the TO VNAV waypoint.
The Vertical Waypoint Select page is displayed. Use the PREV
and NEXT keys to view other flight plan waypoints (ahead of the
FMS present position).
3. Enter the desired flight plan waypoint using the numeric
selection process. This waypoint will be used as a reference to
define the VNAV waypoint location.
4. The cursor expands on the VNAV Cruise page to cover the
offset distance entry field. Use the ± key to change the offset
sign ("-" for offset prior to the flight plan waypoint, "+" for offset
beyond the flight plan waypoint). Enter the offset distance.
5. The cursor expands to cover the target altitude entry field. If an
altitude field entry is three digits and less than 640, then it is
assumed to be a flight level entry. Otherwise it is assumed to be
a regular altitude entry. For example, if "370" is entered, the
altitude field will automatically convert to "FL370" for display. If,
however, the pilot wants to enter an actual altitude of 370 feet,
he must input "0370" in the altitude field. If an altitude is entered
which results in a flight path angle greater than the configured
maximum FPA, then it will flash and not be accepted.
6. Using line select keys [3L, 4L and 5L] to access the NX entry
fields, repeat the above process to define succeeding VNAV
waypoints.
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