At what point during the final approach segment should the transition from GNSS guidance to navigation based on headings occur?

The transition from GNSS guidance to navigation based on headings should occur once the track is stabilised and before reaching the offset initiation point (OIP).

How is the final approach fix (FAF) or intermediate fix (IF) entered into the area navigation system for an ARA to a non-moving offshore location?

The final approach fix (FAF) or intermediate fix (IF) should be manually entered as a range of and bearing from the offshore location.

What is the purpose of using GNSS range of the offshore location during the final approach segment?

The purpose of using GNSS range of the offshore location is to enhance confidence in the weather radar determination of arrival at the OIP and MAPt.

Which data are compared to cross-check the position of the offshore location during an ARA?

Weather radar and GNSS range and bearing data are compared to cross-check the position of the offshore location.

What is the purpose of using GNSS range of and bearing to the destination during an ARA to a non-moving offshore location?

The purpose is to monitor separation from the offshore location.

During which approach segments is GNSS range of and bearing to the offshore location used to cross-check weather radar information?

GNSS range of and bearing to the offshore location is used during the intermediate and final approach segments to cross-check weather radar information.

What should be selected from the area navigation system database or manually entered as the offshore location for an ARA?

The offshore location should be selected from the area navigation system database or manually entered.

GM2 SPA.HOFO.125 Offshore standard approach procedures (OSAPs)

Q: What is the maximum full-scale deviation allowed for the GNSS/area navigation system display when it is used to enhance the safety of an airborne radar approach to a non-moving offshore location?

The full-scale deviation of the GNSS/area navigation system display should be in accordance with the expected navigation performance, and be no greater than 1 NM.

Q: During which segments of an airborne radar approach to a fixed installation should GNSS guidance be used to guide the aircraft onto the final approach track?

GNSS guidance should be used to guide the aircraft onto the final approach track during the initial or intermediate approach segments.

Q: What is the purpose of using GNSS guidance from the FAF towards the OIP during the final approach segment?

The purpose is to establish the helicopter on the correct approach track and, hence, heading.

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GM2 SPA.HOFO.125 Offshore standard approach procedures (OSAPs)

ED Decision 2022/012/R

GLOBAL NAVIGATION SATELLITE SYSTEM (GNSS)/AREA NAVIGATION SYSTEM — AIRBORNE RADAR APPROACH (ARA)

Where an ARA is conducted to a non-moving offshore location (i.e. fixed installation or moored vessel), and the GNSS/area navigation system is used to enhance the safety of the ARA, the following procedure or equivalent should be applied:

(a) selection from the area navigation system database or manual entry of the offshore location;

(b) manual entry of the final approach fix (FAF) or intermediate fix (IF), as a range of and bearing from the offshore location;

(c) the full-scale deviation of the GNSS/area navigation system display should be in accordance with the expected navigation performance, and be no greater than 1 NM;

(d) comparison of weather radar and GNSS range and bearing data to cross-check the position of the offshore location;

(e) use of GNSS guidance to guide the aircraft onto the final approach track during the initial or intermediate approach segments;

(f) use of GNSS guidance from the FAF towards the offset initiation point (OIP) during the final approach segment to establish the helicopter on the correct approach track and, hence, heading;

(g) transition from GNSS guidance to navigation based on headings once the track is stabilised and before reaching OIP;

(h) use of GNSS range of and bearing to the offshore location during the intermediate and final approach segments to cross-check weather radar information (for correct ‘painting’ of the destination and, hence, of other obstacles);

(i) use of GNSS range of the offshore location to enhance confidence in the weather radar determination of arrival at the OIP and MAPt; and

(j) use of GNSS range of and bearing to the destination to monitor separation from the offshore location.

Details

Source-Title: GM2 SPA.HOFO.125 Offshore standard approach procedures (OSAPs) View latest amendments

Erulesid: ERULES-1963177438-13090 Compare versions

Domain: Air operations

Applicabilitydate: 30 October, 2022

Entryintoforcedate: 1 July, 2022

Regulatorysource: ED Decision 2022/012/R Navigate

Regulatorysubject: Part-SPA

Typeofcontent: GM to IR (Guidance material to implementing rule)

Parentir: SPA.HOFO.125 Offshore standard approach procedures (OSAPs)

Origin: EASA

Category: EAR