Crosswords2 mins ago
Aircraft
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I'm a bit of an aircraft enthusiast (not a spotter) seen hundreds land from around 100 ft + away and yesterday for the first time ever one landed with squealy brakes i though to was so funny , sounded like a car that had worn out brake pads,it was an Embraer 195
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Could be one or more of the brake sets… disc, pads or retainers had just been replaced and "wearing-in", which isn't uncommon. Or could have been a warm day and the pilot-in-command (PIC) didn't have the aircraft exactly aligned with the direction of travel and caused the tires (tyros?) to squeal.
A word about reverse thrust… during demonstration of maximum effort landing when the aircraft is achieving a Certificate of Airworthiness (CofA) when newly manufactured, the short field landing, demonstrating how much runway is required for full stop landing and various weight, temperatures, etc., the aircraft is not allowed to deploy reverse thrust, either turbo-jet reverse thrust devices or turbo-prop reversing of the propeller to aide in shortening the landing distance. It has to be brakes only.
To assist in the controllability, most transport category aircraft, such as the EMB-series, are equipped with anti-skid brakes. No matter how much pressure the pilot applies to the toe-activated brakes, the wheels won't skid, thereby protecting the aircraft from a tire blow-out...
A word about reverse thrust… during demonstration of maximum effort landing when the aircraft is achieving a Certificate of Airworthiness (CofA) when newly manufactured, the short field landing, demonstrating how much runway is required for full stop landing and various weight, temperatures, etc., the aircraft is not allowed to deploy reverse thrust, either turbo-jet reverse thrust devices or turbo-prop reversing of the propeller to aide in shortening the landing distance. It has to be brakes only.
To assist in the controllability, most transport category aircraft, such as the EMB-series, are equipped with anti-skid brakes. No matter how much pressure the pilot applies to the toe-activated brakes, the wheels won't skid, thereby protecting the aircraft from a tire blow-out...
just found this, so its not a one off then they can squeal,just first time in decades ive heard it
"Brake Squeal
can be defined as torsional vibrations of
non-rotating components about the axle in the
frequency range of 100-1000 Hz. The root cause of this
mode is largely unknown, however, the erratic vibration
phenomenon from flight test suggest that this mode is
caused by the friction character
istics of brake material.
it produces very high oscillatory loads on the landing
gear/brake structure and can
sometimes cause failure. "
"Brake Squeal
can be defined as torsional vibrations of
non-rotating components about the axle in the
frequency range of 100-1000 Hz. The root cause of this
mode is largely unknown, however, the erratic vibration
phenomenon from flight test suggest that this mode is
caused by the friction character
istics of brake material.
it produces very high oscillatory loads on the landing
gear/brake structure and can
sometimes cause failure. "
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