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f. Equipment and Database Requirements
1. Authorization to fly approaches under IFR
using GPS avionics systems requires that:
(a) A pilot use GPS avionics with TSO-
C129, or equivalent, authorization in class A1, B1,
B3, C1, or C3; and
(b) All approach procedures to be flown must
be retrievable from the current airborne navigation
database supplied by the TSO-C129 equipment
manufacturer or other FAA approved source.
(c) Prior to using a procedure or waypoint
retrieved from the airborne navigation database, the
pilot should verify the validity of the database. This
verification should include the following preflight
and in-flight steps:
(1) Preflight:
[a] Determine the date of database
issuance, and verify that the date/time of proposed
use is before the expiration date/time.
Verify that the database provider has
not published a notice limiting the use of the specific
waypoint or procedure.
(2) Inflight:
[a] Determine that the waypoints and
transition names coincide with names found on the
procedure chart. Do not use waypoints, which do not
exactly match the spelling shown on published
procedure charts.
Determine that the waypoints are
generally logical in location, in the correct order, and
that their orientation to each other is as found on the
procedure chart, both laterally and vertically.
NOTE-
There is no specific requirement to check each waypoint
latitude and longitude, type of waypoint and/or altitude
constraint, only the general relationship of waypoints in
the procedure, or the logic of an individual waypoint's
location.
[c] If the cursory check of procedure
logic or individual waypoint location, specified in
above, indicates a potential error, do not use the
retrieved procedure or waypoint until a verification of
latitude and longitude, waypoint type, and altitude
constraints indicate full conformity with the
published data.
g. GPS Approach Procedures
As the production of stand-alone GPS approaches
has progressed, many of the original overlay
approaches have been replaced with stand-alone
procedures specifically designed for use by GPS
systems. The title of the remaining GPS overlay
procedures has been revised on the approach chart to
“or GPS” (e.g., VOR or GPS RWY 24). Therefore, all
the approaches that can be used by GPS now contain
“GPS” in the title (e.g., “VOR or GPS RWY 24,”
“GPS RWY 24,” or “RNAV (GPS) RWY 24”).
During these GPS approaches, underlying groundbased NAVAIDs are not required to be operational
and associated aircraft avionics need not be installed,
operational, turned on or monitored (monitoring of
the underlying approach is suggested when equip-
ment is available and functional). Existing overlay
approaches may be requested using the GPS title,
such as “GPS RWY 24” for the VOR or GPS
RWY_24.
NOTE-
Any required alternate airport must have an approved
instrument approach procedure other than GPS that is
anticipated to be operational and available at the
estimated time of arrival, and which the aircraft is
equipped to fly. |
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