Route Page with Data Entries
Flight Management, Navigation -FMC Preflight 737 Operations Manual
VIA
The VIA column displays the route segment to the waypoint or segment termination displayed in the TO column. Enter the path which describes the route segment between the previous waypoint and the segment termination.
Enter an airway in the VIA column and box prompts are displayed in the TO column if the previous TO line contains a waypoint on the airway.
Valid entries can also include procedures or DIRECT. Procedures are normally entered through selections on DEPARTURES and ARRIVALS pages. DIRECT is normally entered as a result of entering a TO waypoint first.
Valid airways must:
.
contain the fix entered in the TO waypoint, and
.
contain the previous TO waypoint.
Dashed prompts change to DIRECT if the TO waypoint is entered first.
Dash prompts appear for the first VIA beyond the end of the route.
Invalid VIA entries display the scratchpad entry INVALID ENTRY.
Invalid VIA entries are:
.
airways and company routes which do not contain the TO waypoint of the
previous line
.
airways or company routes that are not in the navigation database.
When entering airways, the beginning and ending waypoints determine if the entry is valid. The route segment must contain the waypoint entered in the TO position. The TO waypoint of the previous route segment must be the same as the beginning point of the current route segment, or a route discontinuity is created between the segments.
Entry of a SID or transition automatically enters the VIA and TO data for the route segments of the SID. A SID automatically links to the next route segment when the final SID waypoint is part of the route segment.
LACRE3.VAMPS is an example of a SID selection made on the DEPARTURES page.
V2 is an example of airway entry.
TO
Enter the end point of the route segment specified by the VIA entry.
Entry of a waypoint in the TO column without first entering a VIA airway displays DIRECT in the VIA column.
Box prompts indicate that an entry is required.
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Flight Management, Navigation -FMC Preflight
Valid waypoint entries for a DIRECT route segment are any valid waypoint, fix,
navaid, airport, or runway.
Valid waypoint entries for airways are waypoints or fixes on the airway.
Dash prompts appear on the first TO waypoint following the end of the route.
ACTIVATE
Pushing the ACTIVATE key arms the route for execution as the active route.
When the EXEC key is pushed, the route becomes the active route and the
ACTIVATE prompt is replaced with the next required preflight page prompt.
Push – prepares the selected route for execution as the active route.
Activation of a route is required for completion of the preflight.
Displayed on inactive route pages.
After route activation, the ACTIVATE prompt is replaced by:
.
PERF INIT when the required performance data is incomplete, or
.
TAKEOFF when the required performance data is complete.
Additional Route Page Prompts for an Activated Route
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Flight Management, Navigation -FMC Preflight 737 Operations Manual
ERASE
Push – removes all pending modifications. Displayed only during modifications.
Performance Initialization (PERF INIT)
Push – displays PERF INIT page.
Displayed only on the ground when required entries on the PERF INIT page are incomplete.
TAKEOFF
Push – displays TAKEOFF REF page.
Displayed only on the ground when all required entries on the PERF INIT page
are complete.
OFFSET
Push – displays LATERAL OFFSET page.
Displayed only in flight.
Departure/Arrival Index Page
The DEP/ARR INDEX page is used to select the departure or arrival page for the origin and destination airports for each route. The index also allows reference to departure or arrival information for any other airport in the navigation database.
Departure and arrival prompts are available for the origin airport. Destination airports have only arrival prompts.
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Flight Management, Navigation -FMC Preflight 737 Operations Manual
Departure (DEP) – Origin
Push – displays the departure page for the origin airport.
Departure (DEP) – OTHER
Displays the departure page for the airport entered into this line through the
scratchpad.
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