FLIGHT TEST OF MODIFIED DTB AND DME FOR ILS.
RADIO CORP OF AMERICA LOS ANGELES CALIF
Pagination or Media Count:
The report describes a series of flight tests made to check the validity of the findings of an investigation of Accurate DME for use with ILS, AD-427 721. The tests were made with an NSME ground beacon, Model DTB supplied by the FAA and an RCA airborne DME Model AVQ-70, both of which were modicied according to the recommendations of the investigation. The tests were made by measuring the slant distance between the aircraft and the ground beacon, at the instant when the aircraft passed over an accurately surveyed ground check point. The measurements were made by crystal-controlled timing equipment of high accuracy which measured the time of arrival of the reply pulse. The passage of the aircraft over the ground check point was established by an optical drift sight. Simultaneous photographs of the check point and the display of the timing device were taken. The results show that an accuracy which is superior to that predicted by the report and superior to the value requested by the FAA can be achieved easily. Author