malfunction of the WAAS system. In flight, Air
Traffic Control will advise pilots requesting a GPS or
RNAV (GPS) approach of WAAS NOT AVBL
NOTAMs if not contained in the ATIS broadcast.

EXAMPLE-
For unscheduled loss of signal or service, an example
NOTAM is: !FDC FDC NAV WAAS NOT AVBL
1311160600- 1311191200EST.
For scheduled loss of signal or service, an example
NOTAM is: !FDC FDC NAV WAAS NOT AVBL
1312041015- 1312082000EST.
(c) Site-specific WAAS MAY NOT BE
AVBL NOTAMs indicate an expected level of
service; for example, LNAV/VNAV, LP, 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
MAY NOT BE AVBL NOTAMs.

NOTE-
Though currently unavailable, the FAA is updating its
prediction tool software to provide this site-service in the
future.

(d) Most of North America has redundant
coverage by two or more geostationary satellites. One
exception is the northern slope of Alaska. If there is

a problem with the satellite providing coverage to this

area, a NOTAM similar to the following example will

be issued:

EXAMPLE-
!FDC 4/3406 (PAZA A0173/14) ZAN NAV WAAS SIGNAL
MAY NOT BE AVBL NORTH OF LINE FROM
7000N150000W TO 6400N16400W. RMK WAAS USERS
SHOULD CONFIRM RAIM AVAILABILITY FOR IFR

OPERATIONS IN THIS AREA. T-ROUTES IN THIS
SECTOR NOT AVBL. ANY REQUIRED ALTERNATE
AIRPORT IN THIS AREA MUST HAVE AN APPROVED
INSTRUMENT APPROACH PROCEDURE OTHER
THAN GPS THAT IS ANTICIPATED TO BE OPERATION-
AL AND AVAILABLE AT THE ESTIMATED TIME OF
ARRIVAL AND WHICH THE AIRCRAFT IS EQUIPPED
TO FLY. 1406030812-1406050812EST .

6. When GPS-testing NOTAMS are published
and testing is actually occurring, Air Traffic Control
will advise pilots requesting or cleared for a GPS or
RNAV (GPS) approach that GPS may not be
available and request intentions. If pilots have
reported GPS anomalies, Air Traffic Control will
request the pilot's intentions and/or clear the pilot for
an alternate approach, if available and operational.

EXAMPLE-
Here is an example of a GPS testing NOTAM:
!GPS 06/001 ZAB NAV GPS (INCLUDING WAAS, GBAS,
AND ADS-B) MAY NOT BE AVAILABLE WITHIN A
468NM RADIUS CENTERED AT 330702N1062540W
(TCS 093044) FL400-UNL DECREASING IN AREA
WITH A DECREASE IN ALTITUDE DEFINED AS:
425NM RADIUS AT FL250, 360NM RADIUS AT
10000FT, 354NM RADIUS AT 4000FT AGL, 327NM
RADIUS AT 50FT AGL. 1406070300-1406071200.
7. When the approach chart is annotated with
the symbol, site-specific WAAS MAY NOT BE
AVBL 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 or circling
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 NOT AVBL NOTAMs apply to all
airports in the WAAS NOT AVBL area designated in the

NOTAM, including approaches at airports where an

approach chart is annotated with the symbol.

8. GPS/WAAS was developed to be used within
GEO coverage over North America without the need
for other radio navigation equipment appropriate to
the route of flight to be flown. Outside the WAAS
coverage or in the event of a WAAS failure,

GPS/WAAS equipment reverts to GPS-only opera-

tion and satisfies the requirements for basic GPS
equipment. (See paragraph 1-1-17 for these
requirements).
9. 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. (See paragraph 1-1-17 d for more
information on equipment requirements.)
(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