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manual supplements will state the level of approach
procedure that the receiver supports. IFR approved
WAAS receivers support all GPS only operations as
long as lateral capability at the appropriate level is
functional. WAAS monitors both GPS and WAAS
satellites and provides integrity.
19.3.3 GPS/WAAS equipment is inherently capable
of supporting oceanic and remote operations if the
operator obtains a fault detection and exclusion
(FDE) prediction program.
19.3.4 Air carrier and commercial operators must
meet the appropriate provisions of their approved
operations specifications.
19.3.5 Prior to GPS/WAAS IFR operation, the pilot
must review appropriate Notices to Airmen
(NOTAMs) and aeronautical information. This
information is available on request from an
Automated Flight Service Station. The FAA will
provide NOTAMs to advise pilots of the status of the
WAAS and level of service available.
19.3.5.1 The term UNRELIABLE is used in
conjunction with GPS and WAAS NOTAMs. The
term UNRELIABLE is an advisory to pilots
indicating the expected level of WAAS service
(LNAV/VNAV, LPV) may not be available;
e.g., !BOS BOS WAAS LPV AND LNAV/VNAV
MNM UNREL WEF 0305231700 − 0305231815.
WAAS UNRELIABLE NOTAMs are predictive in
nature and published for flight planning purposes.
Upon commencing an approach at locations
NOTAMed WAAS UNRELIABLE, if the WAAS
avionics indicate LNAV/VNAV or LPV service is
available, then vertical guidance may be used to
complete the approach using the displayed level of
service. Should an outage occur during the approach,
reversion to LNAV minima may be required.
31 JULY 08
ENR 4.1−36 AIP
15 MAR 07 United States of America
Nineteenth Edition Federal Aviation Administration
a) Area−wide WAAS UNAVAILABLE NOTAMs
indicate loss or malfunction of the WAAS system. In
flight, Air Traffic Control will advise pilots
requesting a GPS or RNAV (GPS) approach of
WAAS UNAVAILABLE NOTAMs if not contained
in the ATIS broadcast.
b) Site−specific WAAS UNRELIABLE
NOTAMs indicate an expected level of service,
e.g., LNAV/VNAV or LPV may not be available.
Pilots must request site−specific WAAS NOTAMs
during flight planning. In flight, Air Traffic Control
will not advise pilots of WAAS UNRELIABLE
NOTAMs.
c) When the approach chart is annotated with the
symbol, site−specific WAAS UNRELIABLE
NOTAMs or Air Traffic advisories are not provided
for outages in WAAS LNAV/VNAV and LPV vertical
service. Vertical outages may occur daily at these
locations due to being close to the edge of WAAS
system coverage. Use LNAV minima for flight
planning at these locations, whether as a destination
or alternate. For flight operations at these locations,
when the WAAS avionics indicate that LNAV/VNAV
or LPV service is available, then the vertical guidance
may be used to complete the approach using the
displayed level of service. Should an outage occur
during the procedure, reversion to LNAV minima
may be required.
NOTE−
Area−wide WAAS UNAVAILABLE NOTAMs apply to all
airports in the WAAS UNAVAILABLE area designated in
the NOTAM, including approaches at airports where an
approach chart is annotated with the symbol.
19.3.6 GPS/WAAS was developed to be used within
SBAS GEO coverage (WAAS or other interoperable
system) without the need for other radio navigation
equipment appropriate to the route of flight to be
flown. Outside the SBAS coverage or in the event of
a WAAS failure, GPS/WAAS equipment reverts to
GPS−only operation and satisfies the requirements
for basic GPS equipment.
19.3.7 Unlike TSO−C129 avionics, which were
certified as a supplement to other means of
navigation, WAAS avionics are evaluated without
reliance on other navigation systems. As such,
installation of WAAS avionics does not require the
aircraft to have other equipment appropriate to the
route to be flown.
19.3.7.1 Pilots with WAAS receivers may flight plan
to use any instrument approach procedure authorized
for use with their WAAS avionics as the planned
approach at a required alternate, with the following
restrictions. When using WAAS at an alternate
airport, flight planning must be based on flying the
RNAV (GPS) LNAV minima line, or minima on a
GPS approach procedure, or conventional approach
procedure with “or GPS” in the title. Code of Federal
Regulation (CFR) Part 91 nonprecision weather
requirements must be used for planning. Upon arrival
　
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