OPERATIONAL EFFECTS OF AIRBORNE EDUCATIONAL TELEVISION ON ULTRAHIGH FREQUENCY (UHF) TELEVISION ASSIGNMENTS ON LAND WERE INVESTIGATED. SPECIFICALLY, THE EFFORT RELATED TO EXPANSION PLANS OF THE MIDWEST PROGRAM ON AIRBORNE TELEVISION INSTRUCTION (MPATI). PREVIOUS STUDIES BY THE NATIONAL ASSOCIATION OF EDUCATIONAL BROADCASTERS (NAEB) LED TO THE DEVELOPMENT OF COMPUTER PROGRAMS WHICH WERE USED IN PRESCRIBING A UHF ASSIGNMENT TABLE. THE SPEED OF THE COMPUTER AND ACCESSIBILITY OF DATA IN THE COMPUTER PROGRAM MADE IT PRACTICAL TO DETERMINE THE IMPACT OF THE PROPOSED MPATI EXPANSION IN TWO CONTEXTS--(1) BY USING NEW STANDARDS WHICH MPATI HAD RECOMMENDED, AND (2) BY USING STANDARDS DEVELOPED BY NAEB ENGINEERS. THE COMPUTER WAS PROGRAMED TO PRINT OUT THE LOCATION AND CHANNEL NUMBER OF ASSIGNMENTS WHICH WOULD HAVE TO BE DELETED IF MPATI PROPAGATION CURVES WERE ADOPTED, AND THOSE WHICH WOULD HAVE TO BE DELETED IF NAEB STANDARDS WERE ADOPTED. THE STUDY INDICATED THAT NO FEWER THAN 60 CHANNELS WOULD BE AFFECTED BY THE MPATI PROPOSAL. FOR THE NAEB PLAN, 83 CHANNELS WOULD BE INVOLVED. IF NEW STANDARDS PROPOSED BY THE MPATI WERE USED, AS MANY AS 46 PROPOSED ASSIGNMENTS WOULD NEED TO BE DELETED. (JC)