On a Boeing 737, why does a cover open and then close on the engine after landing?
I fly on 737s regularly and I’ve noticed that just after the plane has landed a cover opens on the side of the engine for about 10 seconds then slides shut again before the plane has reached the end of the runway. The cover is a meter or so in length and underneath it looks to me like there is an air filter of some description. Any pilots, aviation engineers or plane buffs explain what this is and why it happens?
Reverse thrust.
The engine nacelle ( cover) slides back and angles fins internally to push the bypass air ( the air inside the engine propelling the aircraft forward) to a slightly forward-facing angle. the “air filter” is probably the fins to vent this air in the right direction.
Image of 737 reverse thrusters : http://upload.wikimedia.org/wikipedia/commons/thumb/2/23/Easyjet_thrust_reversers_arp.jpg/800px-Easyjet_thrust_reversers_arp.jpg
Sometimes the reverse thruster is a simple scoop which deploys from the exhaust that just forces the airflow to move, depends on engine type.
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