737 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Cruise
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
11.42.10 D6-27370-866-EGP
Turn construction is based upon FMC criteria which assumes 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 be provided to capture the leg into a
waypoint, the FMC bypasses the affected waypoint and uses alternative turn
construction to intercept that leg. 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.
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.
(SB Changes YK981 - YQ456)
RDNAB LF/ 091
ETRDOMGELS 4/1
RZEEB LF/ 091
o
88MN62
o
08MN24
GDH
o
921MN1
10CAL 4/ 096
DETUOR--NOCSIIUNIT-YT
RZEEB 8.LF/00091
o
88MN62
NEHT
24/05096
GDH
o
921MN1
ETRTCAGELS 4/1
NLE 8.LF/00091
o
88MN91
AUTCA/PNR----L---------
N12.0/05.0MDETR>ATA
RDNAB
RDNAB
8.LF/00091
10CAL
September 24, 2015
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