Evaluation of Sikorsky S-76A 24 Missed Approach Profiles Following Precision MLS Approaches to a Helipad at 40 KIAS (Knots Indicated Airspeed).

This report describes the trend analysis evaluation of the Sikorsky S-76A missed approach profiles following precision microwave landing system MLS approaches at glidepath angles of 3 deg, 6 deg, and 7.5 deg at a minimum instrument meteorology conditions airspeed V sub mini of 40 knots indicated airspeed KIAS. It describes the flight test facilities, methodology, and addresses topics such as how flight test data are collected and what is done with it. It also describes each of the helicopter procedures flown during the project and provides an analysis of the pilots subjective opinions concerning the acceptability and workload associated with these procedures. It was concluded that the trend indicates that no current terminal instrument procedures TERPS criteria would be violated by reducing V sub mini to 40 KIAS. The plots indicated that there wer no penetrations of the 201 surface missed approach surface. The maximum deviation allowed by TERPS for the height loss at missed approach rises along a 201 plane which begins at the surface or 250 feet below surface began at ground level. At most, only a 40-foot fly under at decision height DH was noticed during the 24 missed approaches flown. However, this information should be considered indicative rather than conclusive due to the small sample size 24 approaches. Additional testing would be required to provide TERPS quality data.