NCO.OP.142
Destination alternate aerodromes — instrument approach operations
Regulation (EU) 2021/2237
The pilot-in-command shall only select an aerodrome as a destination alternate aerodrome if either:
(a) an IAP that does not rely on GNSS is available either at the destination aerodrome or at a destination alternate aerodrome, or
(b) all of the following conditions are met:
(1) the onboard GNSS equipment is SBAS-capable;
(2) the destination aerodrome, any destination alternate aerodrome, and the route between them are within SBAS service area;
(3) ABAS is predicted to be available in the event of the unexpected unavailability of SBAS;
(4) an IAP is selected (either at destination or destination alternate aerodrome) that does not rely on the availability of SBAS;
(5) an appropriate contingency action allows the flight to be completed safely in the event of unavailability of GNSS.
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