During a public demonstration in Stockholm, a PIO incident started as the pilot made an aggressive wings-level roll for a pass in front of the crowd.[1] This Stockholm in 1993.[2] The roll-rate limits were engaged, which caused the aircraft to roll more than expected.[1] With the reverse roll control input applied, the rate limits were hit again and the aircraft entered a PIO.[1] Due to the rate-limiting, the inner stabilization loop was no longer effective.[1] This caused the time delay from the pitch control input to the pitch acceleration response to increase from 100ms to 800 ms.[1]
Sources
- [1] RTO-TR-029
- [2] NATO, Ed., Flight Vehicle Integration Panel Workshop on Pilot Induced Oscillations: = (Atelier sur le Pompage Piloté). in AGARD advisory report, no. 335. Neuilly-sur-Seine: AGARD, 1995.
Backlinks
[[Control Surface Rate Limits]]
[[Equivalent Systems Time Delay]]
Pilot-Induced Oscillations
SAAB Gripen
[[SAAB Gripen PIO]]