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PANS-OPSProcedures for Air Navigation Services, Operations (aviation)
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Today, Infrasoft's solvAIRSPACE is a `total solution' application used for modelling and testing obstacle and obstruction clearances around an airport to ICAO PANS-OPS Annex 14 and UK CAA CAP 168 requirements.
Although member nations may publish exceptions, the basic ICAO PANS-OPS (similar to our AIM) calls for procedural entries to be made 30 degrees from track, otherwise an alignment trip around the hold is expected.