GM2 SPA.HOFO.125 Offshore
standard approach procedures (OSAPs)
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.
For safer offshore helicopter operations, especially during airborne radar approaches to fixed locations, EASA recommends using GNSS to enhance navigation. This includes verifying location data, cross-checking radar, and using GNSS for approach guidance until transitioning to heading-based navigation. GNSS range and bearing should continuously monitor position and separation.
* Summary by Aviation.Bot - Always consult the original document for the most accurate information.
Loading collections...