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3-4
Rev 1
The distance field (DIS) always displays 34.5 NM
(nautical miles). If the KLN 90B is interfaced to a
compatible indicator that displays DME distance, the
indicator should be displaying 34.5 nautical miles.
If the KLN 90B is interfaced with a mechanical NAV
indicator such as an HSI or a course deviation indica-
tor (CDI), the D-bar (deviation bar) should be indicat-
ing a half scale deviation to the right. In some EFIS
installations the D-bar may be deflected one third of
full scale. This is due to the different CDI scale factors
that are used. The TO/FROM indicator should be
showing FROM.
If the KLN 90B is interfaced with a NAV indicator
such that the KLN 90B can "read" the selected
course from the NAV indicator, then the OBS IN field
should display the same course as on the NAV indi-
cator.
The OBS OUT field always displays 315 degrees and
is only applicable when the KLN 90B is interfaced
with an HSI which has a driven course pointer capa-
ble of being driven by the KLN 90B. This type of HSI
is normally found in jets and turboprops. If this type
of NAV indicator is interfaced to the KLN 90B, the
course pointer on the NAV indicator should be driven
to 315 degrees and both the OBS IN and OBS OUT
fields should be displaying 315 degrees.
The RMI field always displays 130 degrees. If the
KLN 90B is connected to a compatible RMI in the air-
craft, the RMI should indicate a bearing to the station
of 130 degrees.
If any of the above checks fail, do not use the associ-
ated equipment with the KLN 90B.
5. If the KLN 90B has passed the internal self test, the
bottom left side of the Self Test page will display
ANNUN ON to indicate that the external annuncia-
tors, if installed, should all be illuminated. If instead,
a flashing TEST FAIL is displayed, recycle power to
the KLN 90B. If the Self Test page still displays
TEST FAIL, the KLN 90B requires repair and should
not be used for navigation.