EFFECTS OF FAILURE TYPE, FAILURE ALTITUDE AND AN EXPERIMENTAL PITCH TRIM AUGMENTATION UPON MANDATORY GO-AROUND PERFORMANCE.
Final rept. 20 Oct-3 Nov 67 on phase 4,
BUNKER-RAMO CORP CANOGA PARK CA
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Ten rated pilots flew 320 fully automatic Category III-C zero visibility approaches to landing in a simulator study designed to investigate mandatory go-around performance following control and display system failures at 70, 40, 30 and 20 feet of actual altitude. The utility of an experimental pitch trim augmentation condition which automatically resulted in a 0.25 degree per second pitch-up rate following autopilot failure or disconnect also was investigated. In order to explore the utility of a rollout steering command, one hundred and twenty additional automatic landings were also made, followed by manually controlled rollout to 60 knots. Touchdown performance also was examined. Based upon the severity of sink rates at touchdown, the study showed that automatic landing performance is slightly better than go-around performance when autopilot functioning is unimpaired by system failures. System survivability also was shown to be better if mandatory go-around rather than manually controlled touchdown followed autopilot failures. The experimental pitch trim augmentation also facilitated go-around performance not only by reducing the number of ground strikes but also by reducing the severity of sink rates at the time of ground strike. Although rollout performance was unsatisfactory, the rollout steering command proved promising. As a minimum, additional improvement in the composition of a rollout steering command signal would be required to make manually controlled instrument rollout practical. Author
- Air Navigation and Guidance