Total System Error Error (TSE) Analysis of Helicopter Procedure in an Alpine Environment Flying Advanced RNP Procedures
Heinz Wipf, Airnav Consulting, Switzerland
Location: Regency Ballroom
Date/Time: Wednesday, Apr. 18, 11:15 a.m.
This paper shows data analytical results gathered in flight trials in the course of introducing PBN. Switzerland has extensively researched and probed into IFR helicopter operations under varying conditions and thereby reaching beyond the envelope of OEM-certified limits for the aircraft. Light helicopters in use for disaster relief, SAR and emergency medical services operated by private or state authorities show limited capability to carry extensive avionics due to the weight of other mission critical on-board equipment. With the necessity of an ever-widening operational scenario, all-weather capability becomes a key element in specific helicopter operations. The high maneuverability of these helicopters allows for reduced track distances in time critical operations.
Flight trials using Heli-FIS in the Swiss Alps at 1800m AMSL and above had, among other objectives the gathering of empirical lateral (cross track) Navigation System Error (NSE) and Total System Error (TSE) of an auto-piloted light helicopter with only GNSS as a NAV sensor.
All fights were based on GNSS/SBAS operated in VMC under IFR in airspaces with no ground based navigation means available. Other trial objectives were the helicopter’s FMS/AP capability to fly RNP0.1 AR APCH, RF intermediate segments and LPV - PinS APCH and DEP. The FIS helicopter AW109SP is certified for LPV, LNAV/VNAV, LNAV and RNP0.3 is under review by the OEM. The results show shortcoming in the procedure design and ARINC coding, if an OEM intends to certify for advanced RNP capabilities.