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5.10 THE FUEL MANAGEMENT PAGES
Certain models of fuel management computers manu-
factured by Shadin Company, ARNAV System, Inc, and
Sheltech Ltd. may be interfaced with the KLN 90B. The
primary benefit of having the KLN 90B interfaced with a
“real time” fuel management computer is that the sys-
tem can continuously compute the amount of fuel
required to reach the destination and the amount of fuel
that will be on board upon reaching the destination. The
concept is the following. The fuel management com-
puter continuously sends the rate of fuel flow and the
amount of fuel remaining to the KLN 90B. The KLN 90B
continuously calculates the aircraft’s distance, ground-
speed, and estimated time enroute (ETE) to the destina-
tion waypoint. The fuel required to reach the destination
waypoint is the ETE multiplied by the current rate of fuel
flow. The amount of fuel that will be remaining at the
destination is the amount of fuel presently remaining
minus the fuel required to reach the destination.
CAUTION: The KLN 90B fuel calculations are based
on the present rate of fuel flow, the present ground-
speed, the present distance to destination along the
programmed route, and the amount of fuel presently
remaining. Before take-off, the fuel flow computer
must be properly initialized with the amount of fuel
on board the aircraft. Since many factors influence
the required amount of fuel to reach the destination,
it is the pilot’s responsibility to view the fuel man-
agement pages often to check for any significant
changes. Some factors affecting the amount of fuel
required are power changes, altitude changes,
headwind/tailwind component changes, fuel/air mix-
ture adjustments, and routing changes.
The OTH 5, OTH 6, OTH 7, AND OTH 8 pages are
used to display fuel management information for
KLN 90B’s interfaced with compatible fuel management
computers. If there is no fuel management computer
interface, these fuel management pages are not dis-
played.
5.10.1 The Other 5 Page (OTH 5)
The OTH 5 page displays the following information
(figure 5-122):
• The destination waypoint. An arrow is displayed to
the left of the identifier if the waypoint is the active
waypoint.
• The fuel units as received from the fuel management
computer.
GAL gallons
IMP imperial gallons
L liters
KG Kilograms
LB pounds
Figure 5-122
KLFT GAL|
FOB 126|
REQD 90|
L FOB 36|
RES: 00030|
EXTRA 6|
OTH 5