message, RAIM NOT AVAILABLE, APR MODE
INHIBITED, PREDICT RA IM ON STA 5.
(1) The approach must be discontinued. The
STA 5 page provides a means to predict when RAIM
will be available.
(2) To perform a RAIM prediction on the
STA 5 page, two pieces of information are needed:
the location that the prediction will be for and the time
for the prediction.
(3) The destination waypoint will, by default,
be the missed approach point of an approach loaded
in the flight plan. If there is no approach in the flight
plan, the default waypoint is the last waypoint in the
active flight plan. It is possible for the pilot to enter any
desired waypoint in this field.
(4) The time used for the RAIM prediction will
be the current ETA to the destination airport or the
MAP. This time is automatically updated by the KLN
90B, so there is no need to enter a value. If a RAIM
prediction is desired for planning purposes, it is
possible to enter a time in this field. The time used for
the RAIM prediction is always in the future and is
limited to 24 hours from the present time.
(5) To perform a RAIM prediction, perform
the following steps.
1. Use the left outer and inner knobs to
select the STA 5 page.
2. Press the left CRSR button. The
cursor will be over the DEST field.
waypoint identifier by using the left
inner and outer knobs.
4. Once the desired waypoint identifier is
entered, press the ENT button. Press
information is correct.
5. The cursor will now be over the ETA
field. If necessary, use the left inner
and outer knobs to enter the desired
time and time z one. When the
desired time is entered, press the ENT
button. The RAIM calculations will
start. The calculation will usually take
a few seconds.
complete, the STA 5 page will indicate
the results of the test. Refer to Figure
3-72. This is done graphically in a bar
graph. The center of the bar graph
represents the ETA. Each bar
represents 5 minutes of time. The
± 15 minutes of the ETA. Bars that
are above the line indicate RAIM is
available and bars below the line
indicate when RAIM is not available.
Even more rare will be the case when the KLN
90B cannot provide sufficient integrity monitoring or if
there is an actual satellite failure while the aircraft is on
the leg from the FAF to the MAP. In these cases, the
KLN 90B will flag the navigation solution and a missed
approach will have to be flown. The KLN 90B will
provide the following message, PRESS GPS APR
7. Press the external GPS APR button.
This will change the unit to the
approach arm mode and navigation
information will be restored.
-15 0 +15
Figure 3-72. RAIM Status
contains the pilot NAV SID's and STAR's for the
procedures stored in the database can only be
considered accurate as long as the database is
SID/STAR procedures, there is a lot of information that
is not included in the database. Therefore, the paper
chart is still the primary source of information. Many
procedures require the aircraft to fly at a certain
altitude, along a heading until intercepting a course,
and many other procedures that the KLN 90B cannot
automatically accomplish. Many procedures require
pilot action to ensure that the proper path is flown over
the ground. The main purpose of loading a SID or a
STAR into the active flight plan is to provide a quick
way of loading a potentially large number of waypoints.