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BENDIX/KING KLN 90B
Page 2-68 10521I05.TDC Rev 5, April/2003
OBS knob. Verify that the selected course value displayed on the Mode Page 2 tracks the
new value selected.
In the OBS mode with the GPS displayed on the CDI/HSI, the resolver is disconnected from
the NAV converter. Verify that the KNS 80 or 81 groundspeed is still functional and the Ra-
dial display for the KX 165 or KNS 81 is still functional. These units must have jumpers or
resistors across them when the resolver is removed.
In the OBS mode with the GPS not displayed on the CDI/HSI, the resolver is reconnected
to the NAV converter. Verify that change in the OBS resolver will not affect the selected
OBS on the KLN 90B.
2.4.4.3 Radar Graphics Interface
Activate a flight plan. Verify that the flight plan can be observed on the Radar Graphics display.
Select a "Joystick" waypoint on the Radar Graphics Unit. Verify that the selected
waypoint appears on the SUP Page of the KLN 90B display.
2.4.4.4 Air Data Interface
With altitude being supplied by a compatible Air Data Computer, verify that the proper altitude
is indicated on the ALT page (provided the proper baro setting has been entered and if the Air
Data Computer does not provide baro-corrected altitude).
2.4.4.5 Gray Code Altitude Inputs
With gray code altitude being supplied by a compatible encoding altimeter, verify that the prop-
er altitude is indicated on the ALT page (provided no other altitude sources are active and that
proper baro has been entered).
Verify that there is no interference between the KLN 90B, transponder, and any other loads on
the encoding altimeter output. Remove power from each of the loads on the encoder to verify
that the remaining equipment still performs properly. If interference exists, one or more of the
units are not diode isolated and isolation diodes will need to be added to the aircraft wiring.
2.4.4.6 RMI Interface
Cycle power on the KLN 90B which will cause the self test page to be displayed. Verify that
the RMI indicates 130°.
2.4.4.7 ELT Interface
The following test must be conducted within five minutes after the hour with ELT transmissions
limited to 3 (Three) sweeps. A sweep occurs each time there is a voice transmission. Verify
that the present position is displayed on the KLN 90B Nav Page 2. Activate the Comm Receiv-
er and tune it to 121.5 MHz. Switch The ELT cockpit toggle switch to TEST. The ELT light
should flash and the "sweeping" sound of the ELT should be heard on the Comm Receiver.
Within 1 (one) minute, a voice transmission should be heard which contains the present posi-
tion displayed on the KLN 90B Nav Page 2. Switch the toggle switch to AUTO and push the
reset button until it stops flashing.
2.4.4.8 Moving Map Interface
If the KLN 90B is interfaced to a moving map display, verify operation by moving the aircraft
out to an open location to acquire a satellite position. Enter some active flightplan or waypoint
to develop a presentation on the map. Some moving maps require 30 kts of speed to display
as the sense track angle is used instead of the heading. Output track angles below
30 kts. are not output.