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Rev 1
B-2
BATTERY LOW: SERVICE
REQUIRED TO PREVENT
LOSS OF USER DATA - This message appears when
the KLN 90B’s internal battery is low and needs replac-
ing at an authorized Bendix/King service center. The
battery should be replaced within a week to prevent the
loss of all user-defined data including waypoints, airport
remarks, flight plans, etc. Typical battery life is approxi-
mately three to five years.
CHECK ACTV ANNUNCIATOR - This message
appears when an overcurrent condition is detected on
the ACTV annunciator output. It is usually indicative of
a failure of the wiring between the KLN 90B and the
ACTV annunciator. To determine if the approach mode
is active you will need to look at the status line of the
KLN 90B because the annunciator will not be working if
this message has been given. Have the installation
checked to determine the problem.
CHECK ARM ANNUNCIATOR - This message
appears when an overcurrent condition is detected on
the ARM annunciator output. It is usually indicative of a
failure of the wiring between the KLN 90B and the ARM
annunciator. To determine if the approach mode is
armed you will need to look at the status line of the
KLN 90B because the annunciator will not be working if
this message has been given. Have the installation
checked to determine the problem.
CHECK MSG ANNUNCIATOR - (Check Message
Annunciator) This message appears when an overcur-
rent condition is detected on the MSG annunciator out-
put. It is usually indicative of a failure of the wiring
between the KLN 90B and the MSG annunciator. To
determine if message alerting is being given you will
need to look at the KLN 90B because the annunciator
will not be working if this message has been given.
Have the installation checked to determine the problem.
CHECK WPT ANNUNCIATOR - (Check Waypoint
Annunciator) This message appears when an overcur-
rent condition is detected on the WPT annunciator out-
put. It is usually indicative of a failure of the wiring
between the KLN 90B and the WPT annunciator. To
determine if waypoint alerting is being given you will
need to look at the KLN 90B because the annunciator
will not be working if this message has been given.
Have the installation checked to determine the problem.
DATA BASE CHECKSUM ERR - (Data Base
Checksum Error) This message appears if the data
base fails an internal test when the KLN 90B is turned
on. The most likely cause of the message is a failed
data base cartridge.
DATA BASE OUT OF DATE
ALL DATA MUST BE
CONFIRMED BEFORE USE - This message appears
when the data base is out of date as a result of a date
and time entered on the SET 2 page or Self-Test page
or as a result of a pilot-entered date being overridden by
a date from the GPS receiver.
EEPROM FAILURE: IC_____
EXTERNAL D-BAR INVALID - This message appears
in the event a specific internal test fails. The blanks will
contain the designator of one of the electrical compo-
nents. Record the data before turning the unit off in
order to assist maintenance personnel. Do not use an
external HSI or CDI while it is driven by the KLN 90B.
The rest of the KLN 90B is still usable including the
internal CDI; however, the page displays may not be
centered on the screen.
IF REQUIRED SELECT OBS - This message appears
when the aircraft is 4 NM from a waypoint which could
be used as the basis for either a procedure turn or a
holding pattern and the unit is in the LEG mode. Select
the OBS mode when flying procedure truns or holding
patterns. This message is advisory only. If no procedure
turn is required then no action is required.
INSIDE SPC USE AIRSPACE
[name and type of special use airspace]
[ATC responsible] [Vertical boundaries] - (Inside Special
Use Airspace) This message appears when the air-
craft’s present position is inside an area of special use
airspace. See section 3.10.
MAGNETIC VAR INVALID
ALL DATA REFERENCED
TO TRUE NORTH - This message appears when the
magnetic variation is invalid due to operation outside of
the data base magnetic variation area without having a
pilot-entered magnetic variation. See section 5.12.
MSG ANNUNCIATOR FAIL - (Message Annunciator
Failure) This message appears when there is a failure
of the KLN 90B MSG annunciator drive circuitry. To
determine if message alerting is being given you will
need to look at the KLN 90B because the annunciator
will not be working if this message has been given.
Service the KLN 90B as soon as possible.
NAV SUPER FLAG FAILURE - This message appears
when an internal test fails for a specific NAV flag output.
The KLN 90B is still usable, but anything connected to
the super flag (such as some HSIs and autopilots)
should not be used with the KLN 90B.