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Power Failure (Inflight Initialization)
These procedures are to be followed after electrical power is
restored following a power failure to the FMS. This may include a
simultaneous power loss to the OSS, GPS and LCS sensors. For
inflight initialization refer to POWER FAILURE FOR OVER SEVEN
MINUTES procedure.
Power Failure For Up To Seven Minutes
1. Press the ON/OFF key. If the time span from the beginning of
the power failure to the time this key is pressed exceeds 7
seconds, a POWER FAIL page will be displayed. If the time
span is less than 7 seconds, the CRT will display the same page
that had been in view prior to the power interruption. In either
case, the remainder of this procedure remains the same.
NOTE: The latitude/longitude displayed on the POWER FAIL
page represents the best computed position coordinates
at the time of power failure. The UTC shown is the time of
that failure, and the duration of the interruption is
displayed in minutes and seconds.
2. Press the DATA key to access the FMS Position page (DATA
page 3).
3. Use the line select keys to individually select the best long range
sensor that has a position available (GPS preferred).
Section V
Operations
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NOTE: • If the sensor latitude/longitude coordinates are displayed,
the power interruption lasted less than 7 seconds. The
sensor is continuing to supply the computer with position
information, although it will be in error by the distance
traveled during those few seconds. If this is the case,
proceed to step 5.
• If dashes appear on all sensors, the power interruption
lasted longer than 7 seconds. The latitude/longitude
coordinates displayed after POS represent the FMS dead
reckoning position estimate calculated using the last
known groundspeed and track angle for the duration of
power loss.
4. If the power interruption lasted longer than 7 seconds:
a) Press the FMS # POS line select key to access the
DEFINE POSITION page. Press line select key [2R]
to position the cursor over the system’s latitude
coordinates.
b) Press the ENTER key twice to re-enter the system's
coordinates. The cursor will advance to the
ACCEPT option.
c) Press the ACCEPT line select key to accept the
system's coordinates. This procedure will update
and reinitialize the OSS sensors.
5. Press the DATA key to access the Sensor Summary page
(DATA page 2). After a short delay, the quality factor (Q)
should decrease to a normal value. Use the OSS 1 line
select key to select the OSS Status page. The status line
for each OSS sensor should read NAV. The bottom lines
should show a return of normal station complement, with
SYNC displayed. This may require a short wait.
6. Press the MSG key and check the CRT for messages. The
POS UNCERTAIN message should disappear.
Section V
Operations
5-130 2423sv602
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NOTE: • If an inertial sensor is installed, its backup power supply
will have kept the IRS navigating through the power loss.
• If desired, the IRS1 or IRS2 Nav page may be selected
instead of the OSS1 Nav page. This is accomplished by
positioning the cursor over each FMS best computed
position (POS) coordinate line and manually copying the
IRS's latitude and longitude coordinates. When the
coordinates are entered, the FMS and all OSS and LCS
sensors (if still in the SEARCH mode) will be updated to
the new position.
• It is not possible or necessary to update or change the
IRS latitude/longitude position coordinates once the initial
alignment is correct.
Power Failure For Over Seven Minutes
The following procedure may be applied when electrical power is
restored or when the system is turned on in flight for the first time:
1. Press the ON/OFF key. The system will run through the self-test
and then display the Initialization page. The latitude/longitude
displayed will be coordinates displayed at the time of the power
loss.
2. Press the ACCEPT line select key to accept the initialization
data.
NOTE: The system must be initialized before any updated
coordinates may be input onto one of the Nav pages.
3. Refer to BEST COMPUTED POSITION UPDATE procedure to
update sensor and FMS best computed positions before
selecting a flight plan.
Section V
Operations
2423sv602 5-131
Change 1
NAV Sensor Accuracy Messages
Should one or more messages concerning navigation sensor
accuracy be active, the corrective action(s) required may vary with
the number and type of sensors which are installed. Rather than
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