AirAsia over run.
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I have an idea that may address this problem. The military are of course familiar with these.
What about installing drag shoots for braking. As some of the speeds mentioned the chute maybe the only way to retrieve the situation to a manageable level.
Why not have a net installed at each end of runway. If the controller thinks there maybe an over run he could have the net raised. Or it could be automated. Not sure what sought of installation would be needed to stop a runaway A380. Quite substantial I would imagine.
What about installing drag shoots for braking. As some of the speeds mentioned the chute maybe the only way to retrieve the situation to a manageable level.
Why not have a net installed at each end of runway. If the controller thinks there maybe an over run he could have the net raised. Or it could be automated. Not sure what sought of installation would be needed to stop a runaway A380. Quite substantial I would imagine.
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Or you could just fly a stable approach and if you don't get the flare right, go around instead of floating half way down a runway just to save face. It would be a lot easier, cheaper and of course safer.
What about installing drag shoots for braking. As some of the speeds mentioned the chute maybe the only way to retrieve the situation to a manageable level.
I suggested a FBW enhancement in another thread in which the computers could partially deploy the spoilers in the event of a float to 'help' the aircraft onto the runway earlier. It was pretty much dismissed and I am willing to bet my sanity was called into question in private! However about a week later I was astonished to read (in Flight International) that this very technique was actually deployed manually during a hot and high landing into Grand Cayman and that it PREVENTED an overrun! I think this needs to be looked at again!
Last edited by Doors to Automatic; 4th Jan 2015 at 16:33.
On the A320 the spoilers can partially deploy if the aircraft is not quite on the ground if certain conditions are met. Eg one main gear only or a bounce. It is called the Phased Lift Dump Function.
The spoilers will also deploy automatically even if not armed if both main gear are on the ground, reverse is selected on one engine and the other is below max continuous.
The spoilers will also deploy automatically even if not armed if both main gear are on the ground, reverse is selected on one engine and the other is below max continuous.
What about installing drag shoots for braking. As some of the speeds mentioned the chute maybe the only way to retrieve the situation to a manageable level.
For regular use, the time available required to retrieve and re-pack the chutes will really slow down the operation and it won't be cost effective.
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Originally Posted by Dan Winterland
Carbon brakes wear every time the brakes are applied. As they cool after use, the top layer oxidises and this is what gets worn away on the next application. So if you use full reverse on landing, the brakes apply, then the reverse comes in. At this point, the brakes release a bit to maintain the set deceleration rate. When you stow the reversers, the brakes apply a bit more again to maintain the deceleration rate. By using reverse thrust, you achieve the same landing distance, but e=wear the brakes more and use more fuel. In dry conditions, there is little or no benefit in using full reverse thrust. In wet conditions, or worse, the brakes may not achieve the full selected deceleration rate, and this is where greater than idle reverse thrust should be considered to achieve the desired rate and reduce the landing distance.
I know it's not 320 but does give a bit more background perhaps
Anyway - if it's wet and kakky then anything that helps you stop should be used and damn the brake wear!
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Possibly because EK380 the 'wet' stop line is calculated taking into account the use of Reverse Thrust, and secondly BTV is not available if a thrust reverser is INOP!!!
Reverse idle is fine without BTV but I don't agree with it on a short runway on a kakky day. As I stated already.
Reverse idle is fine without BTV but I don't agree with it on a short runway on a kakky day. As I stated already.