Horizon Air's fleet of 48 Bombardier Q400 regional jets are now all equipped with Universal Avionics' UNS-1Ew flight management systems (FMS).
The FMS units give the aircraft the ability to use the wide area augmentation system (WAAS), allowing pilots to use required navigation performance (RNP) 0.3 with authorisation required (AR) for approaches.
Horizon was the first airline to receive a Federal Aviation Administration (FAA) operations specification approval to perform this type of RNP with a turboprop aircraft.
"We have been flying RNP 0.3 AR approaches for over a year now and to date, our Flight Operations Quality Assurance (FOQA) program has recorded no unstable approaches on RNP approach procedures, both in IMC and VMC," says Perry Solmonson, director of flight standards and training at Horizon Air.
Universal says the benefits of using RNP AR include increased access to airports, reduced fuel emissions and a continuous descent-angle stabilised approach.