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From the FAA library

  • Glossary

    atmospheric pressure. Master switch. A switch in an aircraft electrical system that can disconnect the battery from the bus and open the generator or alternator field circuit. Matrix. The material used in composite construction to bond the fibers together ... that is soluble in water and is used as a solvent for vinyl and nitrocellulose films. MEK is an efficient cleaner for preparing surfaces for priming or painting. Mercerize. A treatment given to cotton thread to make it strong…

  • Chapter 2: Aerodynamics, Aircraft Assembly, & Rigging › Control Systems for Large Aircraft › Hydromechanical Control

    Hydromechanical Control As the size, complexity, and speed of aircraft increased, actuation of controls in flight became more difficult. It soon became apparent that the pilot needed assistance to overcome the aerodynamic forces to control aircraft movement. Spring tabs, which ... were operated by the conventional control system, were moved so that the airflow over them actually moved the primary control surface. This was sufficient for the aircraft operating in the lowest of the high speed ranges…

  • Chapter 6: Flight Controls › Flight Control Systems › Primary Flight Controls

    Flight Control Systems Flight Controls Aircraft flight control systems consist of primary and secondary systems. The ailerons, elevator (or stabilator), and rudder constitute the primary control system and are required to control an aircraft safely during flight. Wing flaps, leading ... edge devices, spoilers, and trim systems constitute the secondary control system and improve the performance characteristics of the airplane or relieve the pilot of excessive control forces. Primary Flight Controls Aircraft control systems are carefully designed to provide adequate responsiveness…