Active Route Legs (ACT RTE LEGS)
The existing route shows BANDR followed by BEEZR and ELN.
DELETE Entry
Push the DEL key to arm the delete function. DELETE is displayed in the scratchpad.
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Flight Management, Navigation -FMC Cruise 737 Operations Manual
Delete BEEZR
With DELETE displayed in the scratchpad, push the line select key left of BEEZR to delete the waypoint. Box prompts replace BEEZR, and a route discontinuity follows the box prompts.
Resequencing Waypoints
Active Route
The existing route shows BANDR followed by BEEZR, ELN then PLUSS. The airplane is cleared BANDR direct PLUSS. The PLUSS waypoint is copied into the scratchpad.
Resequence PLUSS
PLUSS is entered after BANDR. BEEZR and ELN are automatically removed, and the route remains continuous.
Flight Management, Navigation -FMC Cruise 737 Operations Manual
Leg Bypass
Bypass Notification
A waypoint (ELN01) has been entered into the route which is very close to another route waypoint (ELN). It is impossible for the airplane to turn and capture the leg between ELN and ELN01, 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 double bypass condition occurs (bypass of two consecutive legs), a route discontinuity will be inserted. For airplanes with FMC U10, if a triple bypass condition occurs (bypass of three consecutive legs), a route discontinuity will be inserted.
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 box prompts, just as when adding a waypoint.
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Flight Management, Navigation -FMC Cruise 737 Operations Manual
ROUTE DISCONTINUITY
The active route shows a discontinuity. The airplane must fly direct from BANDR to ELN. The ELN 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
ELN 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.
Direct To or Intercept Course (U5 and on)
To fly direct to a waypoint or intercept a course to a waypoint, enter the waypoint name on the active waypoint line, the first line on the MOD RTE LEGS 1/X page. This example shows the result with PLUSS entered into the active waypoint line. A new entry onto this waypoint line displays INTC CRS in the lower right.
Flight Management, Navigation -FMC Cruise 737 Operations Manual
Copyright . The Boeing Company. See title page for details.
11.42.8 December 1, 2000
Flight Management, Navigation -FMC Cruise 737 Operations Manual
Direct Course
Direct course from airplane present position to entered waypoint.
Execute to proceed direct to active waypoint.
Intercept Course (INTC CRS)
Displayed whenever the active waypoint name is modified.
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.
Push – puts displayed course into active waypoint leg direction. Enables intercept
course function.
Leg Direction
Displays the course inbound to the active waypoint after selecting the course displayed in the INTC CRS line.
Crew Desired Intercept Course
The crew can select any inbound course to the active waypoint by first entering
the course into the scratchpad.
Intercept Course (INTC CRS) – Change
Enter the inbound intercept course to the modified waypoint in the scratchpad.
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