Jsuen From United States of America, joined Aug 2001, 211 posts, RR: 0
Reply 1, posted (13 years 4 months 1 week 6 days 18 hours ago) and read 2942 times:
Just about all jets, even bizjets, have an antiskid system. They first appeared on the B-47 in 1946 and in commercial planes, the 707 in 1956. Failure of antiskid often results in blown tires. I believe the automotive version was derived from aircraft.
TechRep From , joined Dec 1969, posts, RR:
Reply 3, posted (13 years 4 months 1 week 6 days 9 hours ago) and read 2898 times:
Yes you are correct Large Jets do have "ANTI-SKID" control. I can attempt to briefly explain it if you would like. Hydraulic systems (A,B and stand by) are employed on the B737. The braking for the B737 in normal mode is from "B" system and when "B" system is not available "A" system is used and is called alternate braking.
Pedal input is recieved from the cockpit transmitted by cable or electrically (dependind on aircraft) to a BMU (Brake Metering Unit), then to a shuttle valve, distrubuted to the anti-skid valves. The B737 100/300 has one normal anti-skid valve for each brake (4ea.) and one alternate for each gear leg (2ea.). Wheel speed is sensed through a wheel speed transducer installed in each axle (4ea). These are basically little DC motors that supply an output voltage to a Anti-skid control unit (ASCU). The anti-skid system has an on/off switch in the cockpit and typically a monitoring display for defective systems within the anti-skid system. Basically the anti-skid system (ASCU) over-rides the pilots metered pressure (brake pedals), by monitoring the wheel speed transducers for wheel lock/speed sensing to stop the aircraft with most efficency.
I hope this was helpful any more questions send me an e-mail.
ThirtyEcho From United States of America, joined Dec 2001, 1695 posts, RR: 1
Reply 7, posted (13 years 4 months 1 week 6 days 4 hours ago) and read 2856 times:
A friend owned an old Aston-Martin and it was one of the first production cars with anti-skid brakes. It seems that the manufacturer simply scaled down the DC-9 system and used that. My friend had to use brake fluid with a Mil-spec that required him to buy it from an airdcraft supply house.