What are the specific requirements for using SBAS-capable GNSS equipment when selecting a destination alternate aerodrome?

The requirements are: (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 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; and (5) an appropriate contingency action allows the flight to be completed safely in the event of unavailability of GNSS.

When selecting a destination alternate aerodrome under the SBAS-capable option, what must be true about the instrument approach procedure selected?

The selected IAP (either at the destination or destination alternate aerodrome) must not rely on the availability of SBAS.

What contingency planning is required if a pilot selects a destination alternate aerodrome using the SBAS-capable GNSS option?

An appropriate contingency action must allow the flight to be completed safely in the event of unavailability of GNSS.

NCO.OP.142 Destination alternate aerodromes -- instrument approach operations

Q: What are the two alternative conditions under which a pilot-in-command may select a destination alternate aerodrome for instrument approach operations?

The pilot-in-command may select a destination alternate aerodrome if either (a) an IAP that does not rely on GNSS is available at the destination aerodrome or at a destination alternate aerodrome, or (b) all of the following conditions are met: the onboard GNSS equipment is SBAS-capable; the destination aerodrome, any destination alternate aerodrome, and the route between them are within SBAS service area; ABAS is predicted to be available in the event of unexpected unavailability of SBAS; an IAP is selected (either at destination or destination alternate aerodrome) that does not rely on the availability of SBAS; and an appropriate contingency action allows the flight to be completed safely in the event of unavailability of GNSS.

Q: If a pilot wants to select a destination alternate aerodrome without relying on a GNSS-based instrument approach procedure, what must be available?

An IAP that does not rely on GNSS must be available either at the destination aerodrome or at a destination alternate aerodrome.

Q: Under the SBAS-capable option for destination alternate aerodrome selection, what is required regarding ABAS?

ABAS must be predicted to be available in the event of the unexpected unavailability of SBAS.

Q: What geographical coverage condition must be met for the destination aerodrome, any destination alternate aerodrome, and the route between them when using SBAS-capable GNSS?

They must all be within the SBAS service area.

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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.

Details

Source-Title: NCO.OP.142 Destination alternate aerodromes -- instrument approach operations View latest amendments

Erulesid: ERULES-1963177438-13664 Compare versions

Domain: Air operations

Applicabilitydate: 30 October, 2022

Entryintoforcedate: 5 January, 2022

Regulatorysource: Regulation (EU) 2021/2237 Navigate

Regulatorysubject: Part-NCO

Typeofcontent: IR (Implementing rule)

Origin: EASA

Category: EAR

NCO.OP.142 Destination alternate aerodromes — instrument approach operations

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