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Operations
Approach Procedures
General Approach Overview
Apollo NMS Approaches
The Apollo NMS may be used to navigate GPS non-precision
approaches. These consist of overlay approaches, GPS approaches
which overlay an existing non-precision approach procedure such as a
VOR, an RNAV, or an NDB approach, and GPS only approaches. GPS
approaches may overlay any type of non-precision approach
procedure except for localizer, LDA, and SDF approaches. GPS
approaches may be either Phase II or Phase III overlay or named GPS
only approaches. The major difference in the overlay approaches is
that for a Phase II approach, the underlying approach NavAid(s) must
be operating and the aircraft must be equipped for the underlying
approach. It is not necessary to monitor the underlying NavAid(s). A
Phase III GPS approach may be conducted even if the underlying
NavAid(s) are not operating.
Phase II GPS Approaches
GPS equipment may be used as the primary IFR flight guidance during
a non-precision approach without actively monitoring the applicable
navaid(s) which define the approach being used. However, the
traditional ground-based navaid(s) required for the published
approach and alternate should be operational and the associated
avionics should be installed and operational. The approach should be
requested and approved by its published name, such as "NDB Runway
24." Modification of the published instrument approach name is not
required. Note: Jeppesen Approach Procedure Charts identify Phase-2
overlay approaches by printing GPS contained in parenthesis, (GPS)
along with the procedure name.
Phase III GPS Approaches
Phase III GPS approaches must contain GPS in the title of the GPS
procedure such as VOR or GPS RWY 24. Neither the ground station
navaid(s) nor the traditional aircraft avionics is required. If the
approach is to be flown using the Apollo NMS, it should be requested
and approved by the GPS name, such as GPS RWY 24. If it is to be
flown with the traditional avionics, it should be requested and
approved by that name, such as VOR RWY 24.
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