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6.1.5 Example Approach: Off-Airport Navaid
An approach that is quite common is an approach that is
based off of an off-airport navaid. An example of this is
the VOR RWY 22 approach to Clovis New Mexico
Municipal airport, KCVN. To fly this procedure as pub-
lished use the following steps and refer to figure 6-17 for
the procedure. For this example assume that the aircraft
is approaching from the Northeast going Direct-to the
Clovis airport with no active flight plan.
1.Load the approach into the flight plan as described in
section 6.1.1. In this case there is only one IAF so the
KLN 90B does not present the option for you to select an
IAF. In this example, there is no active flight plan to begin
with so the KLN 90B will ask to add the airport and the
approach to FPL 0 (figure 6-18).
2.Approaching the area ATC tells you to go direct-to
the TXO VOR and clears you for the approach to KCVN.
This is easy to do from the Super NAV 5 page by pulling
out on the right inner knob and scanning through the
active flight plan by turning the inner knob. Once TXO is
displayed in the scanning window (figure 6-19), press
D
and then Eto initiate a direct to operation to the TXO
VOR.
3.At a distance of 4 NM to the TXO VOR, the KLN 90B
will give the following message:
IF REQUIRED SELECT OBS
This message provides a reminder that to fly a course
reversal the OBS mode needs to be selected. Note from
the approach chart that there is a NoPT Arrival Sector for
this approach. If you are approaching TXO within the
indicated area there is no need to perform a course
reversal and you need to ignore this message. The NoPT
sector is not stored in the database so it is not possible
for the KLN 90B to know if a course reversal is required
or not; as a result, the KLN 90B will always give this
message whenever a waypoint could be used for a
course reversal. The KLN 90B will properly sequence to
the FAF to MAP leg and transition to the approach mode
when 2 NM from the IAF/FAF.
If however, you are approaching from any other direction
a course reversal is required and the OBS mode will need
to be selected. If the OBS mode is not selected before
reaching TXO, then the KLN 90B will automatically
sequence to the missed approach point. This is not desir-
able when performing a course reversal so the OBS
mode must be selected before reaching TXO.
NOTE: The KLN 90B will only remind you to select OBS
mode if the IAF is the active waypoint. Therefore if a
course reversal is required, make sure the IAF is the
selected waypoint.
Rev 1
|V22-KCVN
|PRESS ENT
|TO ADD KCVN
|AND APPR TO
|FPL 0
| APPROVE?
ent CRSR
Figure 6-18
35.2 oq
KCVN |
xy-«} |
165 uv
áà0:13|
ûü227^|
†ü227^|40 TXOì
KCVN
TXO
Q55
Q54
TA87
RW22
Figure 6-19
Figure 6-17