Garmin G1000 Piper PA32 - Manual (Page 224)

GPS NAVIGATION
190-00692-00 Rev. B 5-90 Garmin G1000 Pilot’s Guide for Piper PA32
DIRECTIONAL AIRWAYS/INVERTING FLIGHT PLANS
Some airways have directional restrictions on all or part of the route. Airway “A2” in Europe has a directional
restriction over the whole route such that it can be flown only in the direction MTD-ABB-BNE-DEVAL.
Airway “UR975” in North Africa has more complicated directional restrictions within the list of airway
waypoints AMANO, VAKOR, LIBRO NELDA, DIRKA, GZO, KOSET and SARKI:
• Starting from AMANO, the airway can be flown only to LIBRO.
• Starting from SARKI, the airway can be flown only to LIBRO.
• Between NELDA and GZO, the airway can be flown in either direction.
The Airway Loading Page will be smart about these directional considerations so that only correct airway
sequences can be inserted. If the pilot subsequently inverts that flight plan the system inverts the airway
waypoint sequence but remove all of the airway headers.
NOTE: In the US, airways that are “one-way” for specified hours of operation are not uncommon. These
airways will always be bi-directional in the G1000 database – this is an ARINC 424 limitation.
AIRWAYS AND DATABASE UPDATES
The G1000 allows saving stored flight plans with airways on them. When the database is updated, the
airways will need to be reloaded in a fashion similar to what is done for departures, arrivals and approaches.
The basic process is that each airway segment is reloaded from the database given the entry waypoint, the
airway identifier and the exit waypoint. This re-loads the sequence of waypoints between the entry and exit
waypoints (the sequence may change when the database is updated).
If “optional” airway waypoints have been inserted within the airway sequence, those waypoints will be
included when the airway is updated whenever possible.
The update of an airway can fail during this process. If that happens, the airway is removed from the flight
plan. The following things could cause the airway update to fail:
• Airway entry waypoint or exit waypoint not found in the new database
• Airway identifier not found in the new database
• Airway entry waypoint is not an acceptable entry waypoint for the airway – either the waypoint is no longer
on the airway, or there is a new directional restriction that prevents it being used as an entry waypoint.
• Airway exit waypoint is not an acceptable exit waypoint for the airway – either the waypoint is no longer
on the airway, or there is a new directional restriction that prevents it being used as an exit waypoint (given
the entry waypoint)
• Loading the new airway sequence would exceed the capacity of the flight plan