Beechcraft C-12C Operator And Technical Reference Manual page 231

(3) STA 3 Page. The STA 3 page displays
the software revision status of the KLN 90B host
computer and of the GPS receiver. A field called OBS
CAL is also included on this page. The value indicates
the calibration of the internal resolver circuitry of the
KLN 90B.
(4) STA 4 Page. The STA 4 page displays
the KLN 90B's total operating time and also the
number of times the unit has been turned on. These
values are set to zero if the KLN 90B's nonvolatile
memory is cleared.
bi. Messages.
messages that can appear on the message page.
(1) ACTV ANNUNCIATOR FAIL
message appears when there is a failure of the KLN
90B ACTV annunciator drive circuitry. To determine if
the approach mode is active, look at the status line of
the KLN 90B.
(2) ADJ NAV IND CRS TO 123° - The pilot
should select the suggested course on the HSI. This
message occurs at the beginning of turn anticipation.
(3) ADJ NAV IND CRS - This may appear in
installations where the KLN 90B is interfaced with
EFIS or with a mechanical HSI through the KA 90
adapter. Appears when the difference between the
HSI's selected course and the KLN 90B's selected
course is greater than 0.5°.
(4) AIRSPACE ALERT - Displays when the
estimated time to enter special use airspace is
approximately 10 minutes or the distance is less than
2 nm.
(5) ALTITUDE FAIL - Displays when altitude
input fails. Altitude related features will be disabled.
(6) APT ELEVATION UNKNOWN - Displays
when airport elevation for height above airport alert is
unknown.
(7) ARINC 429 AIR DATA FAIL - This
message indicates that the air data systems with
ARINC 429 outputs are not being received correctly by
the KLN 90B.
(8) ARINC 429
message indicates that the KLN 90B ARINC 429
output fails test. This affects EHI 40/50 electronic HSI
and some navigation graphics displays.
(9) ARM ANNUNCIATOR
message displays when there is a failure of the KLN
90B ARM annunciator drive circuitry. To determine if
The following is a list of
- This
OUTPUT FAIL -
FAIL -
the approach mode is armed, look at the status line of
the KLN 90B.
(10) ARM GPS APPROACH - If the approach
arm mode has been disarmed, the KLN 90B will
prompt arming the approach mode when the aircraft is
3 nm from the FAF.
(11) BAD
RAIM NOT AVAILABLE - Appears only if in the
approach active mode, RAIM is not available, and the
satellite geometry has further degraded to cause more
uncertainty of the aircraft position.
(12) BAD SATELLITE GEOMETRY SEE EPE
ON STA 2 PAGE - RAIM is not available. Possible
position error is greater than allowed for IFR flight.
Crosscheck the position of the aircraft with other
means of navigation.
(13) BATTERY LOW: SERVICE REQUIRED
TO PREVENT LOSS OF USER DATA - Internal
battery is low and needs replacement.
(14) CHECK ACTV ANNUNCIATOR - A
failure between the KLN 90B and the annunciator. To
determine if the approach mode is active, look at the
status line of the KLN 90B.
(15) CHECK ARM ANNUNCIATOR - A failure
between the KLN 90B and the annunciator.
determine if the approach mode is armed, look at the
status line of the KLN 90B.
(16) CHECK MSG ANNUNCIATOR - A failure
between the KLN 90B and the annunciator.
determine if message alerting is being given, check
the display of the KLN 90B.
(17) CHECK WPT ANNUNCIATOR - A failure
between the KLN 90B and the annunciator.
determine if waypoint alerting is being given, check the
display of the KLN 90B.
(18) DATABASE
Database fails internal test.
failed database cartridge.
(19) DATABASE OUT OF DATE ALL DATA
MUST BE CONFIRMED BEFORE USE - Database is
This out of date.
(20) EEPROM FAILURE: 1C___EXTERNAL
D-BAR INVALID - The blanks contain the designator of
a specific failed component. Record the data. Do not
This use it and external HSI. The rest of the KLN 90B is
still usable, including the internal CDI.
displays may not be centered on the screen.
TM 1-1510-218-10
SATELLITE GEOMETRY
CHECKSUM
Most likely cause is a
AND
To
To
To
ERR -
The page
3-77