Flight Management, Navigation -FMC Cruise 737 Flight Crew Operations Manual
Delete VAMPS
With DELETE displayed in the scratchpad, push the line select key left of VAMPS to delete the waypoint. Box prompts replace VAMPS and a route discontinuity follows the box prompts.
Resequencing Waypoints
Active Route
The existing route shows VAMPS followed by BANDR, BEEZR, and ELN. The airplane must fly direct from LAC01 to BANDR. The BANDR waypoint is copied into the scratchpad.
Resequence BANDR
BANDR is transferred to the waypoint following LAC01. VAMPS is removed, and the route remains continuous.
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Flight Management, Navigation -FMC Cruise 737 Flight Crew Operations Manual
Leg Bypass
Bypass Notification
A waypoint (BAN01) has been entered into the route which is very close to another route waypoint (BANDR). It is impossible for the airplane to turn and capture the leg between BANDR and BAN01, so a bypass is noted.
Turn construction is based upon FMC criteria which assume that LNAV is engaged. Normal turn construction may not be possible under certain combinations of airspeed, short leg length, and a significant change in leg direction. If normal turn construction cannot provide a continuous path, the FMC bypasses the affected leg and uses alternative turn construction to intercept the leg to the subsequent waypoint. When the bypass is for the active waypoint, the waypoint remains active until the airplane passes abeam.
Any mandatory altitude–crossing restriction for the bypass waypoint is still
observed if VNAV is engaged, based on passing abeam the waypoint. If a triple bypass condition occurs (bypass of three consecutive legs), a route discontinuity will be inserted.
Copyright . The Boeing Company. See title page for details.
11.42.6 September 27, 2004
Flight Management, Navigation -FMC Cruise 737 Flight Crew Operations Manual
Removing Discontinuities
A discontinuity exists when the FMC is unable to determine the route leg following a waypoint. Discontinuities are removed by linking the route segment following the discontinuity to the route segment preceding the discontinuity.
The next desired waypoint from the subsequent route is copied into the CDU scratchpad and entered into the discontinuity, just as when adding a waypoint.
ROUTE DISCONTINUITY
The active route shows a discontinuity. The airplane must fly direct from LAC01 to BANDR. The BANDR waypoint is copied into the scratchpad in preparation to remove the discontinuity. Any waypoint from the route can be copied into the scratchpad to remove the discontinuity.
Continuous Route
BANDR is copied into the box prompts to remove the discontinuity. Entering a waypoint which does not already exist on the route moves the discontinuity one waypoint farther down the route.
Copyright . The Boeing Company. See title page for details.
Flight Management, Navigation -FMC Cruise 737 Flight Crew Operations Manual
Direct To and Intercept Course
To fly direct to a waypoint or intercept a course to a waypoint, enter the waypoint name on RTE LEGS page 1 active waypoint line. The INTC CRS prompt displays in line 6R. The example shows the result with YKM entered into the active waypoint line.
Direct Course
Direct course from airplane present position to entered waypoint. Execute to proceed direct to active waypoint.
Intercept Course (INTC CRS)
Push – puts displayed course (155) into active waypoint leg direction. Enables
intercept course function.
Displayed whenever the active waypoint name is modified.
Copyright . The Boeing Company. See title page for details.
11.42.8 September 27, 2004
Flight Management, Navigation -FMC Cruise 737 Flight Crew Operations Manual
Displays flight plan leg direction to entered waypoint in small font. Displays
dashes if entered waypoint was not in the flight plan.
Valid input is any course from 000 through 360. May be changed until executed.
Entered or selected value displays in large font.
Leg Direction
Displays the course inbound to the active waypoint after selecting the course displayed in the INTC CRS line.
Intercept Course (INTC CRS) – Change
Enter the inbound intercept course to the modified waypoint in the scratchpad.
Select the INTC CRS line to change the leg direction.
The example shows 220° intercept course to YKM entered in the INTC CRS line.
Copyright . The Boeing Company. See title page for details.
Flight Management, Navigation -FMC Cruise 737 Flight Crew Operations Manual
DIR INTC Key YA613, YA626
Proceeding direct to a waypoint or intercepting a course to a waypoint may also be accomplished by using the direct intercept (DIR INTC) mode select key. Pushing the DIR INTC key adds box prompt options to the bottom of the ACT RTE LEGS page.
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