Saturday, June 10, 2017

Aircraft Brakes|Introduction

With the development of aircraft braking systems steel brake pads were replaced by carbon composite brakes. They have many added advantage over steel brakes. When compared to steel brakes carbon composite brakes weigh 40% less and have a longer life span. Steel brakes were able to use for approximately 1000 landings and newer carbon composite brakes are able to perform for 1200-1500 landings. Carbon composite shows higher friction when rubbed against each other and possess higher capability to absorb more heat. This quality is more important during an aborted take-off hence carbon composite brakes can withstand up to 3000°F while steel brakes can withstand only up to 2000°F.

There are two types of braking systems incorporated in an aircraft braking system, they are normal brakes and alternate brakes. Normal brake is powered by green hydraulic system while alternate brakes receives it's pressure from the yellow hydraulic system(For A320). Pressurized fluid directed to needed pressure cylinders by internal passages in the carrier. When normal or alternate pistons receive pressurized fluids them will extract and push the pressure plate towards the rotors and staters. Then due to the friction between rotating(carrier rails rotates the rotating carbon discs) and stationary(stationary part is fitted to the torque tube) carbon composite discs(stationary part is fitted to the torque tube) whole the brake unit rotation will be reduced and then the aircraft speed will also reduce. 

                                                                 This image shows the carrier rails


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