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BENDIX/KING KLN 90B
Rev 5, April/2003 10521I05.TDC Page 2-69
2.4.4.9 External Annunciators
Recycle the power on the KLN 90B which will cause the Self Test Page to be displayed. Verify
that all external annunciators are energized. Cycle the KLN 90B display past all initialization
pages. Verify all external annunciators are extinguished. If the message light comes on, view
the Message Page to verify that there is a message. If any other annunciator remains lighted,
review the status of the KLN 90B to determine if the lighted annunciator is justified. OBS and
LEG annunciators are controlled directly by the annunciator switch contacts and are not driven
by the KLN 90B. Toggle the GPS CRS switch to verify that the annunciator switch matches
the KLN 90B mode.
NOTE
Annunciators should be checked one at a time in or-
der to verify that the correct one lights.
2.4.4.10 Distance Indicator
Verify that during self test, the distance indicator displays 34.5 NM, 0 KTS, 0 MIN.
2.4.4.11 Dataloader
The data base cartridge may be updated using a 3.5" disk and a laptop computer. The laptop
computer must be IBM compatible, have an open COM 1 or COM 2 serial port, and have a
3.5" high density diskette drive.
Connect an IBM compatible laptop via PC loader kit P/N 050-03213-0000 (ref. figure 2-18).
Set the KLN 90B to the Set 0 page. Put the #1 diskette into the PC. Cycle the power of the
PC and follow the menu driven instructions.
NOTE
The KLN 90B database may be updated using a PC
with the KLN 90B mounted in an aircraft, or via a
KCC 90 (ref. figure 2-18).
2.4.4.12 ALT ALERT
, ALT ALERT AUDIO
Upon approval of the self test page, five (5) beeps will be issued on the audio output and five
(5) sonalert bursts will be produced by the ALT ALERT
output, if ALT ALERT is not strapped
low.
2.4.4.13 Heading Interface
Heading information may be interfaced to the KLN 90B by ARINC 429 or RS 232 to aid in the
calculation of wind vectors and for heading orientation of the NAV 5 or moving map, and
to enable the ARINC 429 roll steering output. ARINC 429 heading information is provided from
an EFIS 40/50 system or a KA 90 interface adapter through the EFIS 429 receiver. RS 232
heading information may be provided from an analog to RS 232 converter, such as the Shadin
fuel/air data device, through the RS 232 input.
Display the NAV 5 page and select the HDG orientation to test the heading function. If a valid
heading source is available, HDG orientation will be selectable. If the heading is from an RS
232 source and the KLN 90B has not been upgraded to software 1102 or later, it will be nec-
essary to have a valid GPS position before the heading input will be recognized. ARINC 429
heading information is recognized with or without a valid position and may be tested in the
hanger.