Applying Neal-Smith FQ criterion to the Space Shuttle

During the 1977 Approach and Landing Tests, Space Shuttle Enterprise exhibited PIO during its 5th and last landing.

Applying modern FQ criteria to the Space Shuttle approach transfer function unveils the poor FQ (Level 2 to Level 3). The analysis based on the Pilot-in-the-loop or Neal-Smith criteria is indicated below.

The Nichols chart is shown only for 2.5 rad/sec bandwidth frequency, while multiple BW analysis indicates the trend and the degradation of FQs.


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