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(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.
(a) 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.
(1) 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.
(2) 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.
(3) 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.
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.
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.
(a) 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
A71I1M0.65R CHG 2 37//1315//078
2/14/Navigation Aids 1−1−39
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 at an alternate, when the
WAAS navigation system indicates that LNAV/
VNAV or LPV service is available, then vertical
guidance may be used to complete the approach using
the displayed level of service. The FAA has begun
removing the NA (Alternate Minimums Not
Authorized) symbol from select RNAV (GPS) and
GPS approach procedures so they may be used by
approach approved WAAS receivers at alternate
airports. Some approach procedures will still require
the NA for other reasons, such as no weather
reporting, so it cannot be removed from all
procedures. Since every procedure must be individually
evaluated, removal of the NA from RNAV
(GPS) and GPS procedures will take some time.
d. Flying Procedures with WAAS
1. WAAS receivers support all basic GPS
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