The below is taken from a flight plan and details are described.
Route leg for escape route consideration.
Highest MORA value considered for escape route generation.
OFFSET. This is the offset distance from the beginning of the leg in nautical miles at which point the described escape route will be safe to use. If the only offset shown is 000 then this means that the escape route is safe to use for the entire leg. If additional offset distances are listed then each escape route is only safe to use from the listed starting offset up to and including the next listed offset. The route for the last offset will be safe to use up until the end of the leg. In the above example the first escape routes are needed, the system will evaluate every 50 NM to ensure that the previous route is safe and will create a new one when it is not. The default of 50 NM is configured by NAVBLUE Support staff.
Suitable airport selected for escape route.
GCD - Great circle distance to suitable airport.
AWYDIST - Airway distance to suitable airport.
TIME - Enroute time to suitable airport.
Escape route generated.
Escape routes can be displayed on the MAP (yellow dotted line) between waypoint and suitable airport as show below.
Click on "Flight" button.
Click on "Escape Routes" option.
Click on "Oxygen", "Driftdown", or both. Once selected, click anywhere on the map and the escape routes will appear.
There are many options available for determining how to select suitable airports for escape routes. The options are as follows:
Filtering by runway length.
Filtering by Runway Surface (Soft, Hard, Water, Undefined)
Filtering by PCN number (Pavement Certification Number)
Using Airport Suitability (FOMS Menu 122) as the exception
Using Airport Suitability (FOMS Menu 122) as the main database for suitable airport selection.
Note: Options 4 and 5 are more labor intensive as they require more time updating the Airport Suitability database. These two options also require assistance from NAVBLUE Support.
Selecting this option requires that a minimum runway length be entered for each aircraft in FOMS Menu 220 (Aircraft Characteristics).
NFP will look for suitable airports using the Airports database (FOMS Menu 105) and will only choose airports which meet the minimum runway length entered.
Selecting this option requires that a runway surface type be entered for each aircraft in FOMS Menu 220 (Aircraft Characteristics) as shown below.
Surface types are Soft, Hard, Water, Undefined.
NFP will look for suitable airports using the Airports database (FOMS Menu 105) and will only choose airports which meet the minimum runway length entered.
Note: Not all airports currently have the surface type field populated as this comes from the AIRAC cycle.
Selecting this option requires that the ACN (Aircraft Certification Number) pavement type be entered for each aircraft in FOMS Menu 220 (Aircraft Characteristics) as shown below.
PCN data for each runway is updated by the AIRAC cycle and can be seen in both the FOMS Menu 105 and FOMS Menu 107 databases.
FOMS Menu 105 (Airport database)
FOMS Menu 107 (Runway database)
Note: Not all airports currently have the PCN data populated as this comes from the AIRAC cycle.
Selecting this option requires that the Airport Suitability database (FOMS Menu 122) be populated with airports which cannot be used for escape routes.
NFP searches for suitable airports using the Airports database (FOMS Menu 105) and will only choose the ones which are not flagged as "N" in the "Emergency" column within the Airport Suitability database (FOMS Menu 122).
Selecting this option requires that the Airport Suitability database (FOMS Menu 122) be populated with all suitable airports that are required for escape routes. The flight planning system will only search this database for suitable airports to be used for escape routes (flag set to "Y" in emergency column).
Note: Options 4 and 5 require NAVBLUE Support.
Important: The Airport Suitability database will always take precedence over any other airport selection criteria.