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Operations
Approach Procedures
Approach Waypoints
General
The database waypoints which describe the TSO C129a GPS
approaches correspond with the waypoints which appear on the
approach procedure charts whenever possible. VORs, NDBs, and
named Intersections will appear in the approach sequence as they are
on the charts. The Rifle, Colorado VOR will be identified RIL, the
Turno Locator/Outer-Marker (LOM) at Salem, Oregon will be
identified SL, the Forsyth NDB, at Forsyth Montana will be identified
FOR, and the HIKOX intersection, used as an Initial Approach Fix
(IAF) for VOR/DME or GPS RWY 3 approach at Casper Wyoming,
will be identified as HIKOX.
Many waypoints that are specific to TSO C129a GPS approaches
require that a name be assigned to them, such as an Initial Approach
Fix (IAF) which is shown on the approach procedure chart as a radial
and distance from a VOR. These waypoints may or may not appear on
the approach procedure charts. Jeppesen includes the names of many
of these waypoints on their approach procedure charts; however, these
names are usually not included on National Ocean Service (NOS)
charts.
TSO C129 Overlay specific.
TSO C129 requires the equipment to prompt the pilot to enter the local
altimeter setting, if not already entered, at 3 nm inbound to Final
Approach Fix, FAF. It also requires that the equipment change RAIM
alarm limits from 1 nm to 0.3 nm and to begin changing CDI sensitivity
from 1 nm full-scale deflection to 0.3 nm full-scale deflection when 2
nm inbound to the FAF. The TSO also requires that the final leg of the
approach be defined as a path between the FAF and the MAP
waypoints (bearings to or from waypoints are not allowed for the final
segment). For these reasons, a GPS TSO C129a approach must always
have an FAF lying on the inbound course to the MAP, even when there
is no such waypoint in the underlying approach. There are many GPS
overlay approaches, such as the VOR or GPS-B approach to
Wenatchee Washington, where there is no FAF inbound. The EAT
VOR is the Initial Approach Fix (IAF), Final Approach Fix (FAF),
Missed Approach Point (MAP), and Missed Approach Holding Point
(MAHP). When there is no FAF inbound waypoint for a GPS
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