While flying manually (without the autopilot), the pilot will use the thumb switches to activate the electric trim, but when the autopilot is engaged, the autopilot keeps the aircraft in trim using the same system. It is impossible to miss this wheel turning as it has stripes painted on it. Accidentally leaving the crank handle extended is a self-critiquing error as the handle hurts like heck when it hits your knee (so I’ve been told).
#Clearview simulator elevator trim manual#
This wheel also serves as a manual crank to be used if the electric motor fails. The slow speed is used for flaps up and the fast speed activates when the flaps are extended. The motor has two speeds determined by flap position. This wheel is mechanically connected to a jack screw which physically moves the stab. The switches (two for redundancy) control an electric motor which spins a large wheel next to the pilot’s knee on the center stand. On the 737, stab trim is normally controlled electrically by switches on the control column which are activated with the thumb. This condition is also the most aerodynamically efficient configuration resulting in a smaller fuel burn. A pilot can release the controls of a well-trimmed aircraft without it wanting to climb or descend. Change the speed of the aircraft, and the trim will need to be changed to prevent the pilot (or autopilot) from having to hold constant force on the controls. The horizontal stabilizer itself also moves a bit to “trim” the aircraft for a particular airspeed. It moves to change the pitch of the aircraft. The elevator is attached to the back of the horizontal stabilizer and is a primary flight control. The horizontal wing on the tail of a conventional aircraft is known as the horizontal stabilizer (stab). There are many online resources available for those who wish for a more in depth explanation of aerodynamics. I am going to attempt to keep my explanations in reach of a general audience with some basic understanding of the dynamics of flight. The events surrounding the grounding of the MAX center on the stabilizer trim system. Tomás Del Coro from Las Vegas, Nevada, USA, CC BY-SA 2.0, via Wikimedia Commons Stabilizer Trim: What Is It? Southwest Airlines plans to return their Boeing 737 MAX aircraft to the skies in Q2 2021. My airline has procured nine MAX simulators for the purpose of re-qualifying all their pilots in as short a time as possible. That said, the devices cost tens of millions of dollars and training time is scarce and valuable. Flight in high fidelity flight simulators is considered equivalent to flight in an actual aircraft, but superior as a training device as many maneuvers and failure scenarios can not be safely accomplished in an aircraft. Preparation for the ride included an extensive computer based refresher course on MAX systems and procedures and a detailed pre-brief on the planned simulator training events.
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