To perform fuel planning operations:
1. Press
N
and rotate
O
until NAV Menu 1 is displayed.
2. Press
C
twice and rotate
O
until ‘Fuel Plan?’ is highlighted. Press
E
.
3. Rotate
K
to select either ‘wpt’ for direct navigation or the desired route number. Press
E
.
4. For waypoint-waypoint navigation, use
K
and
O
to enter the ‘to’ and ‘from’ waypoints.
Press
E
to accept the waypoints. To use the present position as a waypoint, leave the
corresponding waypoint field blank.
5. For route calculations, choose either ‘cum’ for cumulative route fuel requirements
(from beginning to end) or the leg desired by rotating
K
K
.
If leg is selected, it displays the amount of fuel required to fly until that leg is complete.
For example:
The fuel required to complete leg 2 is leg 1 + leg 2.
Fuel required to complete leg 4 is leg 1 + leg 2 + leg 3 + leg 4.
6. Rotate
O
to advance the cursor to ‘fob:’ or ‘gs:’ (depending on which is displayed).
7. Use
K
and
O
to enter the fuel on board or the ground speed. Press
E
.
8. Rotate
O
back two positions to highlight the ‘fob:’ or ‘gs:’ field again.
9. Rotate
K
to display the other information. Press
E
.
10. Use
K
and
O
to enter the remaining data. Press
E
.
11. Use
K
and
O
to enter the flow rate, in units per hour, if needed. Press
E
.
The GNC 250XL will calculate the range and endurance (i.e., how long the fuel
will last) of your aircraft. These are found in the first field on the bottom row of the
page. The amount of fuel left on board (lfob) and reserve time after the selected
direct-to, leg or route is flown are displayed in the second field on the bottom row.
25
Fuel planning page with other information
indicating ‘endurance’ and ‘reserve’ times.
Fuel planning page showing calculations between
two waypoints.
SECTION
1
NAV KEY
NAV Menu 1
Fuel Planning
250xl manual 2 7/17/98 1:27 PM Page 25
