Table 3-15. Approach Waypoint Naming
C stands for course fix
D stands for DME arc waypoint. Aaa is
the radial that the fix is on from the
reference VOR. B will be a letter
corresponding to the distance from the
reference VOR. For example, G is the
seventh letter of the alphabet so D234G
would be a point on the 234° radial 7
nm from the reference VOR. DME arcs
greater than 26 nm will have waypoints
where the first two characters are the
first two letters of the DME identifier.
The next three characters will be the
radial that the arc waypoint is on.
F stands for final approach fix
I stands for intermediate approach fix
M stands for missed approach fix
RW stands for runway fix. This is
usually the MAP for the approach. Zzz
will be a runway number, possibly
including L for left, R for right, C for
center, or B for both.
In the rules above, x and yyy are defined as
follows: for runways with only one approach, x will be
replaced with an A or an F; and for runways that have
multiple approaches, x will be replaced with V for
VOR, N for NDB, or R for RNAV. The letters yyy will
be replaced with either the runway identifier (e.g.
FF25L) or, for circling approaches, the inbound course
to the missed approach point (e.g. MA259).
Waypoints along a given radial will be named
such that the first three letters are the reference
VOR/DME and the next two are the DME distance. If
the distance is greater than 100 nm, the order is
reversed. For example, LAX18 is 18 nm from LAX
while 26FLW is 126 nm from FLW.
Some waypoints have a dash and a small letter
at the end of the waypoint name. The small letter is an
aid to help recognize important points in an approach.
These suffixes are displayed on the FPL 0 page, the
Super NAV 5 page, and the Super NAV 1 page. The
suffixes are shown in Table 3-16.
Table 3-16. Approach Waypoint Suffixes
final approach fix
initial approach fix
missed approach point
missed approach holding point
Every approach will have an FAF and a MAP.
Almost all will have an IAF and a missed approach
Another item in the flight plan is the line *NO
WPT SEQ. This is what is referred to as a fence and
is an alert that the KLN 90B will not automatically
sequence past the waypoint that precedes the fence.
The waypoint before the fence is always the missed
approach point. The reason that waypoint sequencing
is not allowed is that many missed approach
procedures require specific action before going to the
missed approach holding point, e.g., climbing on a
fixed heading until reaching an altitude.
aq. Changing Or Deleting An Approach Once
Loaded Into The Flight Plan. The sequence of
waypoints retrieved from the database of the KLN 90B
defines the approach procedures as they are charted.
To ensure that the proper path over the ground is
followed, it is not possible to either delete or add
waypoints to the approach section of the flight plan.
To help see which waypoints are en route waypoints
and which are approach waypoints, the KLN 90B does
not display a colon next to the waypoint number on the
FPL 0 page if the waypoint is an approach waypoint.
It is only possible to replace the existing
approach with another one, or delete the entire
approach from the flight plan.
1. With the left page displaying the active
flight plan (FPL 0), turn the left cursor on.
Refer to Figure 3-62.
2. Move the cursor so that it covers the
approach header at the top of the
approach procedure. Refer to Figure
3-63. Once the cursor comes over the
approach header, it will change to read
CHANGE APR?. If the ENT button is
pressed, the APT 8 page will automatically
come up on the right side. Now it is
possible to select different approach
procedures, different LAS's, or both.