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The field also goes to dashes during a descent (digital systems only)
when the aircraft is 200ft lower than the CRUISE ALT and the
Preselect is set to a lower value. If the PRESEL is analog the altitude
value will remain in the CRUISE ALT field. When the aircraft is within
200ft of the PRESEL ALT the CRUISE ALT changes again to the
same value as the PRESEL ALT.
TRANS LEVEL:
Transition Level used to
determine the altitude at
which the system converts
altitudes to Flight Levels.
This field defaults to FL180 if
the pilot does not enter a
value. (Figure 2-46)
DEFAULT FPA:
The FPA defaults to the 3.0
unless it is manually entered.
The default descent Flight
Path Angle can be manually
entered in degrees and tenths (0.1 to 6.0 range) (Figure 2-46).
DEFAULT FPA is used to calculate #TOD to the first altitude con-
straint on the Active Flight Plan. However an FPA must be entered
on the VNAV waypoint page to establish a PATH DESCENT and for
Vert Dev or vertical deviations to be valid.
NOTE: Pilot enters numbers only, as the decimal point (.) prefills as
a default.
PRESEL ALT:
If configured, Preselected Altitude input from system, in feet or Flight
Level. (Figure 2-46)
NOTE: An analog type preselector only displays PRESEL ALT
when the aircraft is within 1000ft of actual altitude.
RANGE (NM):
If configured, Range to Pre-selected Altitude in nautical miles and
tenths (0.0 to 999.9 range). (Figure 2-46)
ETE:
If configured, the estimated time enroute to the Pre-selected Altitude
in hours, minutes and tenths. (Figure 2-46)
Page Display Definitions
2-39
GNS-XL Flight Management System
Rev. 0
Oct/96
CRUISE ALT FL250
TRANS LEVEL FL180
DEFAULT FPA 3.0
PRESEL ALT FL250
RANGE (NM) 33.7
ETE 00:13.6
VNAV DATA 1/1
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Figure 2-46