Date of Award

12-2024

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Aerospace, Physics, and Space Sciences

First Advisor

Ralph D. Kimberlin

Second Advisor

Eric D. Swenson

Third Advisor

Rian Mehta

Fourth Advisor

Danilo de Camargo Branco

Abstract

Loss of Control (LOC) in General Aviation (GA) remains one of the leading causes of aviation accidents, with 94% of all accidents in 2022 occurring in this sector, and 42% attributed directly to LOC [2][3]. This thesis focuses on the Full Trimming Tail (FTT) in Mooney aircraft, hypothesizing that the FTT design significantly increases the likelihood of LOC, particularly during go-arounds and touch-and-go landings. Prior studies have shown that certain trim systems can amplify pitch-up moments following rapid configuration changes, leading to stalls or LOC if not adequately managed by the pilot [23][24][25].

This research utilized a combination of logistic regression analysis and simulated flight tests to quantify the impact of the FTT. The analysis of over 400 NTSB (National Transportation Safety Board) and FAA (Federal Aviation Administration) accident reports revealed that the presence of FTT more than doubles the odds of LOC, with slower response times and lower pilot experience further compounding the risk. Simulated flight tests confirmed that FTT-equipped Mooney aircraft experienced faster stall onset and a more pronounced pitch-up response compared to other trim systems.

Overall, the findings of this study conclude that FTT significantly increases the risk of LOC in Mooney aircraft. This outcome confirms the initial hypothesis and highlights the need for targeted interventions, such as design modifications or changes to the FAR, to mitigate the unique challenges posed by the FTT.

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