Case Study: The Military Version Of The Cessna 172)

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The T-41 (i.e., the military version of the Cessna 172) had a "simple mechanical" flight control system using direct mechanical linkages. Direct feedback of forces acting on the control surfaces to the control stick (or yoke) provided a natural feel. The feedback was by the "seat of the pants". The trim system was a mechanical linkage connected directly to a trim control wheel in the cockpit. There is no warning in the T-41 if the trim was set incorrectly. It is the pilot’s responsibility to comply with the checklist.
The F-4 had a "simple augmented" system containing mechanical pushrods and cables, but with a power assist (augmentation) which gave the pilot a mechanical advantage allowing faster control surface movement at high speeds.
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Computer functions provided stability augmentation as well as command augmentation to help the pilot achieve the desired aircraft response throughout an expanded maneuvering envelope. Redundancy was maintained by the existing mechanical controls. The F-15 had to be designed with a large airframe due to all of the flight control hardware. The F-15 had a takeoff trim button used to center the trim prior to takeoff. If the pilot failed to center the trim before takeoff, there would be no warning. The pilot was expected to comply with the …show more content…
A takeoff trim system was installed to allow positioning of the horizontal tail for optimum performance during takeoff. The rudder trim knob was electrically powered and on the left console. The T-38 had a takeoff trim button used to center the trim prior to takeoff. If the pilot failed to center the trim before takeoff, there would be no warning. The pilot (many times a student who was solo without an instructor) was required to comply with the checklist. I have 150 hours of flight time in the T-38 as a student

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