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5-40
Rev 1
• The fuel presently on board (FOB). In most installa-
tions this is defined by using the fuel flow computer’s
control unit. However, if the KLN 90B is interfaced
with a compatible Shadin fuel flow computer, it is
possible to define the fuel on board by using the KLN
90B. In these installations it is not required to have
the fuel flow computer’s control head installed in the
aircraft. To change the present fuel on board (FOB)
use the following procedure:
1. Turn to the OTH 5 page.
2. If it is possible to enter the present fuel on board
by using the KLN 90B there will be a colon (:) follow-
ing FOB on the display. If the colon exists press the
left C(figure 5-123), if the colon does not exist it is
not possible to change the fuel on board through the
KLN 90B (figure 5-122).
3. Enter the current fuel on board (FOB) using the
left inner knob (figure 5-124). Make sure the amount
entered is consistent with the units used by the fuel
flow computer.
4. Turn the left Coff.
• The fuel required to reach the destination waypoint
at the current rate of fuel flow and the present
groundspeed (REQD).
• The landing fuel on board (L FOB) is the fuel
presently on board minus the fuel required to reach
the destination.
• The desired fuel reserve (RES). You may enter here
the amount of reserve fuel you wish to have upon
landing. The fuel must be entered in the same units
as displayed on the first line. To enter the reserve,
press the left C, rotate the left outer knob to move
the cursor over each of the desired reserve digits,
and use the left inner knob to select each digit.
Press the left Cwhen finished to turn off the left
cursor function.
• The calculated extra fuel (EXTRA). This is the land-
ing fuel on board (L FOB) minus the fuel reserve
(RES) you entered.
Figure 5-124
Figure 5-123
KLFT GAL|
FOB: 126|
REQD 90|
L FOB 36|
RES: 00030|
EXTRA 6|
OTH 5
KLFT GAL|
FOB: 97|
REQD 90|
L FOB 46|
RES: 00030|
EXTRA 6|
OTH 5