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FMS pitch commands (refer to specific AFMS), then enroute VNAV
profiles may be flown while coupled to the Flight Guidance System
(FGS). The FMS computes a Vertical Pitch Command, which is
recognized when VNAV is selected on the FGS Mode Select Panel.
When the aircraft is two minutes from the Top of Descent capture
point the MSG light flashes and the message "2 MIN TO TOP OF
DESCENT" appears on the MSG page. This message is removed
after from the MSG page after it is acknowledged and the autopilot
will attempt to capture the VNAV path. During this two-minute period
the pilot may arm VNAV on the FGS Mode Select Panel. (Note that
the Altitude Preselector, if installed, must be set to an altitude at
least 200 feet below the current altitude before VNAV can be armed
on the FGS mode panel.) At 15 seconds to TOD or any other vertical
waypoint, a WPT annunciator flashes, and "VNAV WAYPOINT
ALERT" appears on the message page. Pressing the MSG key will
change the flashing WPT to steady and extinguish the MSG
annunciator. The aircraft will then capture and fly the defined VNAV
profile. Vertical deviation at capture is dependent upon aircraft
speed and the path angle. The Glideslope pointer on the Collins
EFIS display may still be off the scale when the path is initially
captured.
Section V
Operations
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Change 1
If the pilot fails to arm VNAV during this period, the FGS will not
allow VNAV to be coupled. This is to preclude any abrupt pitchover
maneuver that may occur after the capture point. If the pilot
manually flies the aircraft near the vertical profile with vertical
deviation and aircraft vertical speed within limits, then VNAV may be
re-selected on the FGS Mode Panel.
When an altitude preselector is installed; during descent, if the
Altitude Preselector is set at an altitude which is higher than a
defined VNAV leg, the aircraft will automatically cancel FGS VNAV
mode and level off to Altitude Select Mode when that altitude is
encountered.
NOTE: During VNAV descents involving large course changes,
the flight director may command descent rates, which do
not center the vertical deviation symbol. Flight director
cues should be followed and vertical deviation will recenter
after the new course is tracked.
Section V
Operations
2423sv602 5-75
Change 1
ARRIVALS – STARS AND APROACHES
The navigation data base contains a full compliment of arrival
procedures. These include STARs and the majority of approaches
found on commercially available navigation charts. Although the
following procedure for linking these procedures into a flight plan is
shown in one continuous process, STARs and approaches can be
programmed independently of each other.
Linking STARs and Approaches into a Flight Plan
When given an Arrival Procedure by ATC, the STAR may be linked
into the flight in a similar manner to the way a SID is selected. To
link a STAR:
1. From FPL MENU page press the ARRIVE line select key to
access the ARRIVAL page. The destination airport will prefill
into the ARRIVE field.
2. Enter the reference number for the landing runway from the list
in the RUNWAY.
After the runway is selected, the cursor will advance to the STAR
field, and a list of STARs for that airport will appear.
3. Select the STAR by entering the reference number from the list.
Section V
Operations
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Change 1
Next, a list of transitions for the selected STAR will appear.
4. Select the transition by entering the reference number of the
appropriate transition. A list of approaches will appear.
5. Select the approach by entering the reference number of the
approach in use. A list of transitions, if any, will be displayed.
6. Select the desired transition by the reference number entry
method.
NOTE: Selecting the approach and its transition may be delayed
until later in the flight.
Section V
Operations
2423sv602 5-77
Change 1
At this point selecting the FPL line select key will return display to
the FPL pages, where the STAR legs and approach will now be a
part of the flight plan, as shown below:
Automatic Gaps in Flight Plans
When a SID, STAR and Approach are linked into a Flight Plan, *NO
LINK* will be inserted at the transition points if the end waypoint of
one procedure is not exactly the same as the beginning waypoint of
the next procedure. These can occur at the SID-to-Enroute, the
Enroute-to-STAR, and/or the STAR-to-Approach transitions. These
discontinuities arise because the FMS does not know what path the
　
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