曝光台 注意防骗
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Approach Type RNP
NDB, NDB/DME 0.6 NM
VOR, VOR/DME 0.5 NM
RNAV 0.5 NM
GPS 0.3 NM
October 31, 2006
777/787 Flight Crew Training Manual
Approach and Missed Approach
Copyright © The Boeing Company. See title page for details.
5.32 FCT 777/787 Preliminary (TM)
Use of LNAV
To use LNAV for approaches and missed approaches, a proper series of
legs/waypoints that describe the approach route (and missed approach) must
appear on the LEGS page. There are two methods of loading these waypoints:
• Database Selection
This method is required for RNAV and GPS approaches. An approach
procedure selected through the FMC ARRIVALS page provides the
simplest method of selecting proper waypoints. Procedures in the
database comply with obstruction clearance criteria for non-ILS
approaches.
No waypoints may be added or deleted between the FAF and the MAP. If
the approach to be flown is not in the database, another approach having
the same plan view may be selected. For example, an ILS procedure
might be selected if the plan view (route) is identical to an NDB approach.
In this case, waypoint altitudes must be checked and modified as required.
When an approach is flown by this "overlay" method, raw data should be
monitored throughout the approach to assure obstacle clearance.
Note: If an NDB approach for the desired runway is in the database, an
overlay approach should not be used.
If a waypoint is added to or deleted from a database procedure, FMC “on
approach” logic (as described in the FCOM) is partially or completely
disabled and the VNAV obstacle clearance integrity of the procedure may
be adversely affected. If an additional waypoint reference is desired, use
the FIX page and do not modify waypoints on the LEGS page.
• Manual Waypoint Entry
Due to potentially inadequate terrain clearance, manual waypoint entry
should not be accomplished for RNAV or GPS approaches, nor should
this method be used with VNAV after the FAF.
When no procedure is available from the FMC ARRIVALS page, manual
entry of a series of waypoints may be accomplished to define the
approach routing. The waypoints may be conveniently defined by using
names of waypoints or navaids in the database, bearing/distance from
such fixes, intersections of radials or latitude/longitude information.
Procedure turns and DME arcs cannot usually be manually entered
(unless they can be defined by a series of waypoints). Deviation from the
defined route may require use of “DIRECT TO” or “INTERCEPT
COURSE TO” when intercepting the inbound course. Constant
monitoring of raw data during the approach is required.
Note: Procedure turns and DME arcs may require use of HDG SEL/TRK
SEL.
October 31, 2006
777/787 Flight Crew Training Manual
Approach and Missed Approach
Copyright © The Boeing Company. See title page for details.
FCT 777/787 Preliminary (TM) 5.33
LNAV cannot be used to track fix or radial data displayed on the map that is not
part of the active route. A navaid/waypoint and the appropriate radial may be
inserted on the FIX page to create a “course” line on the map that helps to improve
situational awareness. A similar display may be created by manually tuning an
appropriate VOR and selecting the desired course. These methods provide
reference information on the map display only. They are not reflected on the
LEGS page and cannot be tracked with LNAV. These methods should only be used
when there is no opportunity to use an approach selected from the navigation
database and should therefore be considered only when normal means of
displaying approaches are not available. Pilots should be aware that the displayed
course is an FMC calculated course and is not raw data information.
Note: HDG SEL or TRK SEL should be used to fly the approach ground track.
Note: Automatic procedure tuning is not available with manually entered
waypoints.
If the approach is not available in the NAV database, select the landing runway
from the FMC ARRIVALS page. The runway and associated extended centerline
then displays on the map to aid in maintaining position awareness.
Pilots should not become involved in excessive “heads down” FMC manipulation
to build map displays while at low altitude. Raw data VOR, ILS, and ADF
displays should be used to avoid distractions during higher workload phases of
flight. Map building should be avoided below 10,000 feet AGL.
Use of VNAV
Approaches using VNAV may be accomplished using any of the recommended
roll modes provided in the FCOM procedure.
October 31, 2006
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787机组训练手册Flight Crew Training Manual 787(78)
