OFFSHORE M-ADS Modified Automatic Dependent Surveillance

OFFSHORE M-ADSBACKGROUND THE START OF THE NORWEGIAN OIL ADVENTURE

OFFSHORE M-ADSBACKGROUND THE FIRST OF MANY FATAL ACCIDENTS

OFFSHORE M-ADSBACKGROUND 1990: Helicopter Safety Study by research company SINTEF Conclusion: Safety improvement in the North Sea helicopter operations was required. NCAA decision: To use ADS as recommended by ICAO for surveillance outside radar coverage.

OFFSHORE M-ADS BACKGROUND 1990 : RADAR COVERAGE OF THE NORWEGIAN SHELF

OFFSHORE M-ADSBACKGROUND 1991: NCAA launched the M-ADS-project in co-operation with: - 7 oil companies, - Helikopter Service AS - Kongsberg Defence & Aerospace. - Telenor Satellite

OFFSHORE M-ADSBACKGROUND The ADS-Contract-system (ADS-C) was chosen for the surveillance, and based on ICAO’s ADS-concept: - technical specifications in RTCA DO the recommended ATN - data-linking via INMARSAT

OFFSHORE M-ADSBACKGROUND 1991: Phase I - Testing the long communication-chain of dataflow via datalink. 1994: Phase II - Reorganisation of the project. Further testing of datalink. 1996: Report from ”ATM & Procedures task force”. Operational testing with 2 M-ADS equipped helicopters.

OFFSHORE M-ADSBACKGROUND 1996: The M-ADS project divided in: Operational Concept-group - producing ”M-ADS operational criteria and procedures”. HMI-group producing HMI-specifications for the ”Radar and ADS Display System” (RaADS).

OFFSHORE M-ADS OPERATIONAL 1999: January1st - M-ADS mandatory for all helicopters operating on the Norwegian Shelf. April 22nd - operational testing at Stavanger ATCC. October 1st - M-ADS installed in 38 helicopters. 2000: January 1st - M-ADS operational at Stavanger, Trondheim and Bodø ATCC

OFFSHORE M-ADS OPERATIONAL Purpose To improve safety by improved ATS with surveillance of all offshore helicopter operations on the Norwegian Shelf. The result: - Improved Alerting Service - Improved Flight Information Service

OFFSHORE M-ADS OPERATIONAL Improved Alerting Service RaADS provides automatic functioning alarms (by blinking, colour, sound, position, time) when: - update of a radar-track has failed - update of an ADS-track has failed - abnormal descend occurs - the pilot initiates emergency signals

OFFSHORE Alerting Signals - Transponder code 7500/7600/ Activated alarm-button on the M-ADS equipment - Emergency descend (2000 FT/min.+) - ”Coasting” of a radar-track - ”Timetag” when no update of an ADS-track M-ADS OPERATIONAL

OFFSHORE M-ADS OPERATIONAL Improved Flight Information Service RaADS will display all radar- and ADS-tracks to ATS integrated at one display. The improvements for ATS: - Able to give exact traffic information - Collect information from helicopter FMS (via ADS) - Maintain continuous surveillance ( = dct. routing ) - No oral position reports => less R/T load + improved ATS alertness

OFFSHORE M-ADS OPERATIONAL Information Groups: Basic: Latitude/Longitude Altitude Time when message was sent Accuracy (Figure Of Merit) SSR:SSR code + on/standby indication Weight-on-wheels + valid indication

OFFSHORE M-ADS OPERATIONAL Earth Reference: True Track Ground Speed Vertical Rate

OFFSHORE M-ADS OPERATIONAL Air Reference: True Heading (Mach Speed) Vertical Rate

OFFSHORE M-ADS OPERATIONAL Meteorological: Wind Speed Wind Direction Temperature

OFFSHORE M-ADS OPERATIONAL Predicted Route Lat/Long/Altitude at next waypoint ETA at next waypoint Lat/Long/Altitude at next + 1 waypoint

OFFSHORE M-ADS OPERATIONAL Position update rate : Operational (Test period) Normal rate: 30 seconds (45 seconds) Tracks within 20NM + sep. less than 1000’: 20 seconds (30 seconds) Tracks within 10NM + sep. less than 1000’ and ops. below 700’: 10 seconds (15 seconds)

OFFSHORE M-ADS OPERATIONAL ADS-areas Published area - Between land and the main oil fields - From 1500’ MSL to FL85 - In Class G airspace

OFFSHORE M-ADS OPERATIONAL The purpose - Provide ADS and radar based Alerting Service and FIS to M-ADS equipped aircraft - Reduce flight time by direct routes - Published request to all other traffic to avoid ADS-areas or to establish contact with the ATC before entering

OFFSHORE M-ADS OPERATIONAL ADS-AREAS: Frigg Sleipner Ekofisk

OFFSHORE M-ADS THE FUTURE Development - datalink via VHF for Air Traffic Control Service - combined ADS-C and ADS-B (with CDTI and CPDLC) CDTI = COCKPIT DISPLAY OF TRAFFIC INFORMATION CPDLC = CONTROLLER PILOT DATA LINK COMMUNICATION