Evaluation of Approach Procedures for ILS Back Course with Glide Slope

摘要

An operational evaluation was performed to compare ILS back course approaches with front course approaches in an effort to determine flyability problems associated with back course ILS with glide slope and the appropriate obstracle clearances to be applied. 32 simulated approaches were flown in the B720 flight simulator. 63 hooded approaches were flown in 6 different aircraft. Facility and airborne systems included Back and Front courses; Localizer only and Localizer with Glide Slope; Normal and Reverse course sensing; and all were flown using raw ILS data for guidance. A questionnaire was filled out on each subject pilot at the end of his runs. Heights above touchdown at which ils guidance became ususable were computed from simulator tracings and data logs. (Authors)