Two Litton LTN-90 laser gyro strapdown navigation systems were flight tested in 39 flying hr in a DO 28, in rapid alignment and alignment with engines running. Accuracies of 1.4 km/hr maximum for position, 1.2 m/sec for velocity and 0.1 deg for angular position and azimuth are found. Navigational accuracy is no worse during alignment with running engines. Rapid alignment (3 min) lets the pilot realign the system even shortly before starting and optimize actual navigating time to pure flying time. The beginning of navigation time cannot be accurately determined by the flight engineer as displays give only very little information. However, preparation time, 45 min for the CAROUSEL 4 a in the DO 28, is reduced to 10 min for the LTN-90.
Flight Testing the Litton LTN 90 Laser Gyro Strapdown System for Civil Aviation
1985
39 pages
Report
No indication
English