737 Flight Crew Operations Manual
Flight Management, Navigation -
Flight Management System
Operation
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
11.31.10 D6-27370-866-EGP
Vertical Required Navigation Performance (VRNP)
YW273, YW274
The FMC uses 400 feet as a default Vertical Required Navigation Performance
(VRNP) value for oceanic, en route, and terminal phases of flight.
When required, VRNP values may be manually entered or displayed on RNP
PROGRESS page 4/4. The FMC will accept manual entry of a VRNP value
greater than the default value, but the VERIFY VERT RNP VALUE advisory
message will be displayed in the scratchpad. Manual entries are cleared at flight
completion.
Lateral Navigation (LNAV)
(SB Changes YK981 - YQ456)
LNAV provides steering commands to the next waypoint. If selected, LNAV
engages when laterally within 3 nautical miles of the active route leg. If outside of
3 nautical miles of the active route leg, LNAV engages if on an intercept heading
of 90 degrees or less and the intercept will occur before the active waypoint. FMC
LNAV guidance normally provides great circle courses between waypoints.
However, when an arrival or approach from the FMC database is entered into the
active route, the FMC can supply commands to fly a constant heading, track, or
follow an arc, as required by the procedure.
400 FEET
VRNP VALUE FOR OCEANIC, EN ROUTE,
AND TERMINAL PHASES OF FLIGHT
400 FEET
September 15, 2016
To Next Page
Loading...
