April 13, 2011
By Dan Namowitz
The FAA has issued a flight advisory for potentially unreliable GPS signals in the vicinity of Fallon, Nev., through April 13. The agency also issued a flight advisory for similar testing in New Mexico.
During testing GPS signals may be unreliable or unavailable within a 400-nautical-mile radius (nmr) centered at 393316N/1174400W, or the Mina (MVA) VOR 13.14-degree radial at 60.96 nm at Flight Level 400 and above, decreasing in area with decrease in altitude to a 345 nmr at Flight Level 250, 265 nmr at 10,000 feet msl, 265 nmr at 4,000 feet agl, and 250 nmr at 50 feet agl.
Pilots are encouraged to report anomalies to the appropriate air route traffic control center to help determine the extent of signal degradation. Please share your reports with AOPA.
Notams will be published at least 24 hours in advance of tests, but may change with little or no notice. Pilots are encouraged to check notams frequently for changes to operations in the area. Tests will be conducted during the entirety of stated times, the FAA said.
The testing schedule is set for April 12 through 13, 1430Z to 0815Z, and April 13 through 14, 1330Z to 0730Z.
Dan Namowitz is an aviation writer and flight instructor. He has been a pilot since 1985 and an instructor since 1990.
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