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What prevents the landing gear from retracting while on the ground?
There is a weight sensor which senses if the plane is on the ground. This sensor prevents gear retraction while the plane is still on the ground.
Can landing gear retract on ground?
Well, the short answer is no. Modern airplanes have something called “Squat switch”. Essentially it is a sensor, which can tell if a plane is still standing on the ground. When the squat switch is activated, meaning that the plane is still on the ground, it is physically impossible to retract the landing gear.
Why does the landing gear lever have a wheel on it?
It’s a carry over from the day when aircraft had more levers in the cockpit. It was standard and in many cases an Federal Aviation Regulation that different controls ended with a different shape handle so during reduced visibility such as darkness or smoke that the pilots could determine the type of control by feel.
Why do airplanes pull up their landing gears after take off?
Planes that have retractable gear generally retract their gear for improved performance. Not having wheels and struts hanging down streamlines the plane, improves fuel efficiency, enables them to fly faster and higher, and makes for a quieter, more comfortable ride inside the cabin.
Why does the landing gear control have 3 positions ( up / down / off )?
I’ve noticed that Boeing 737-800’s cockpit has a 3-position landing gear lever. During takeoff, the pilot moves the lever from DOWN to UP and then to OFF position.
Can the landing gear be pulled up while the plane is on?
On the accident airplane type, the mechanism would lock the gear handle, but the lock can be overridden if the pilot manually pull out and move the handle. The instructor confidently pulled out the handle and to his surprise, the hydraulics started to move and the gears were retracted while the plane was still on the ground.
How is the weight of the landing gear determined?
Besides airborne / ground detection, the struts absorb the vertical energy during touchdown. I recall some decades ago engineers experimented obtaining the plane’s gross weight by installing weight scales to each landing gear (as opposed to just an air/ground detection).
Why is hydraulic pressure removed from landing gear?
Removing hydraulic pressure allows the gear to hang on the mechanical uplocks that were specifically designed to hold them, without putting additional wear on the actuators. The other reason is that gear actuators are major users of hydraulic fluid volume, and the actuators and the lines that supply them are a potential for leakage.