AMC1 ATS.TR.155(f) ATS surveillance services
ED Decision 2020/008/R
TOLERANCE VALUE FOR PRESSURE-ALTITUDE-DERIVED LEVEL INFORMATION
The tolerance value used to determine that the pressure-altitude-derived level information displayed to the air traffic controller is accurate should be ±60 m (±200 ft) in RVSM airspace. In other airspace, it should be ±90 m (±300 ft), except that the competent authority may specify a smaller criterion, but not less than ±60 m (±200 ft), if this is found to be more practical.
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