Chapter 8
Critical Airspaces
Critical airspace shows a list of airspaces within 100km of the pilot’s position. This list is generated
when in flight mode and is ordered by the sequence in which the airspace appears in the file used
to create the airspace. Other airspaces may be loaded in the airspace internal database and not
displayed in this list since they are more than 100km from the pilot’s position.
If the pilot moves by more than 30 km from the original position, the list of critical airspaces is
reloaded from the airspace internal database based on the new position of the pilot.
A typical list of airspace may look like Figure
8.1
. Note that the number in parentheses indicates
the number of airspace polygons loaded into the instrument.
Figure 8.1: Critical Airspace
On selecting enter, the lower field is populated with key data (Figure
8.2
). This list shows:
•
the Distance to the CTR if within the threshold (see Section
13.16
),
•
the Altitude which is the reference altitude for the airspace (see Section
13.16
),
•
the floor of the airspace which is the lowest altitude of the airspace,
•
the ceiling which is the maximum altitude of the airspace.
The list also shows if the pilot is violating airspace, violation imminent or out of airspace. The
reference altitude is the current altitude being used for airspace calculation. Different reference
altitudes can be set in the Airspace settings (section 15.15 Airspace settings) and these include
Altitude (barometric altitude), GPS altitude and Flight Level (using 1013.25 mBar pressure). For
more details on this see Section
13.16 Airspace settings
.
35
Summary of Contents for NAV
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