D. Symbols
(1) Waypoints If the flight plan contains the same waypoint in more than one position in the flight plan (primary, alternate or TEMPORARY), transmission of the symbol, ident, and any associated constraint data, if appropriate (i.e the waypoint constraint option has been selected) occurs only once according to the priorities defined in table (Ref. Fig. 008)
(a)
Active waypoint If an active leg exists in the ACTIVE flight plan, the termination of the leg is called the active waypoint symbol and is transmitted as such to the ND except in the cases noted below:
(b)
Flight plan waypoints For the ND, flight plan waypoints are defined as the Reference Fix(es) of the FIX INFO pages or the termination waypoints of all legs including the FROM waypoint (except for PPOS), but excluding the active waypoint and origin and destination waypoints. The waypoint must be within the edit area.
(c)
Pseudo waypoints The pseudo waypoints transmitted for display on the ND are a subset of the performance predicted pseudo waypoints. The pseudo waypoints that may be transmitted to the ND are listed in Figure. (Ref. Fig. 008)
1_ The waypoint is a Non-Directional Beacon (NDB) and the NDB
pushbutton switch option has been selected, or it is a tuned
NDB. In this case, the waypoint is transmitted as an NDB or
tuned NDB.
2_ The waypoint is a navaid and the navaid pushbutton switch
option has been selected or it is tuned navaid. In either case
the waypoint is transmitted as a navaid (i.e VORTAC or VORDME,
VOR only (DME or TACAN only) or tuned navaid.
3_ The waypoint is an airport (and/or associated RWY) and the
ARPT pushbutton switch option has been selected or it is the
destination waypoint. In either case, the waypoint is
transmitted as an airport or the destination waypoint.
4_ The waypoint is the termination of an FM or a VM leg. In this
case, no waypoint symbol is transmitted.
The pseudo waypoint symbols are transmitted for the ACTIVE flight plan only (if it is being transmitted and they lie within the defined edit area). If an offset is active, the pseudo waypoint symbols are transmitted on the offset path. The pseudo waypoint symbols are all sent as background data except for level 3 distance, speed limit distance, and Required Distance to Land, which are sent as dynamic data when they exist. The pseudo waypoint symbols are transmitted for the following mode selections:
-ARC
-PLAN
-ROSE-NAV
(d) Origin/destination waypoints If an origin and/or destination exists in the ACTIVE primary, alternate, TEMPORARY or SECONDARY flight plan, it is transmitted with the origin/destination waypoint symbol under the conditions noted below:
-The origin/destination waypoint symbol is transmitted for the origin/destination waypoint of the corresponding flight plan
(i.e. only for the flight plan being transmitted) if it is within the defined edit area.
-
If the waypoint is the alternate origin waypoint (equal to the primary destination) it is not transmitted (only the primary destination is transmitted).
The manner in which the symbol is transmitted depends upon
whether or not the destination is a runway or airport and the
range selected.
These cases are noted below:
-
If the origin/destination waypoint is an airport, the airport symbol is transmitted.
-
If the origin/destination waypoint is a runway and an enroute range is selected (i.e 320 or 160 NM) the runway is transmitted including the airport and runway idents and the heading with respect to true north (note that if it is the origin, the runway heading with respect to true north is displayed and the destination is runway heading + 180 degrees).
-
If the origin/destination waypoint is a runway and a terminal area range is selected (i.e 10, 20, 40 or 80 NM), the runway is transmitted including the airport and runway idents, the heading with respect to true north and the paved length of the runway.
If the waypoint CSTR pushbutton switch option is selected and the origin/destination waypoint has constraints associated with it, the constraint data are displayed unless the origin/destination is the FROM waypoint. Note that "constraints" in this sense are Time constraints and/or Minimum Safe Altitude (MSA) data. ALT and SPD constraints are neither entered nor displayed at the origin/destination waypoint.
中國航空網(wǎng) www.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：A320飛機維護手冊 AMM AUTO FLIGHT 自動飛行4(54)
