Thrust Reverser falls off 747 in Frankfurt
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James T73J - Brakes/RT
Hi James
If you can get hold of a AOM (you can find a copy on the net for 737-800) the manual goes in some detail as to why aircraft use reverse thrust.
You are right
in that the use of the reverse thrust helps reduce the huge load on the brakes, as you can imagine brakes on a 747/767/757 or A340 are very costly to replace. Greatest load is present at highest rate of knots, so deploying reverse thrust once you have main gear touch.
The level of brake modulation is calculated and the force required to slow aircraft down at a set rate is dependant on whether reverse thrust/spoiler deployment has taken place, so if no reverse thrust or idle reverse thrust is used then the force required by the brakes is that much greater.
Anyone remember what happen with that Qantas flight that overran on a wet runway landing BangKok?? no/idle reverse thrust or autobrake set to 1 or 2 rather than 3 or Max?
If you can get hold of a AOM (you can find a copy on the net for 737-800) the manual goes in some detail as to why aircraft use reverse thrust.
You are right
in that the use of the reverse thrust helps reduce the huge load on the brakes, as you can imagine brakes on a 747/767/757 or A340 are very costly to replace. Greatest load is present at highest rate of knots, so deploying reverse thrust once you have main gear touch.The level of brake modulation is calculated and the force required to slow aircraft down at a set rate is dependant on whether reverse thrust/spoiler deployment has taken place, so if no reverse thrust or idle reverse thrust is used then the force required by the brakes is that much greater.
Anyone remember what happen with that Qantas flight that overran on a wet runway landing BangKok?? no/idle reverse thrust or autobrake set to 1 or 2 rather than 3 or Max?
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Looks like more T/R inspections coming up, a few years ago QANTAS lost a cold stream nozzle out of Cairns. This caused a lot of problems for us but we haven't lost one since.
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Well, mon ami, I have ended up on a slippery runway (31R at JFK) in a DC-10 with the cockpit over the grass but the wheels, luckily, still on the concrete.
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Anyone remember what happen with that Qantas flight that overran on a wet runway landing BangKok?? no/idle reverse thrust or autobrake set to 1 or 2 rather than 3 or Max?
flaps 25 no reversers
Autobrakes were orignally set to '2', the captain later adjusted them to '3' after ATC informed them the runway was wet
you can read the full ATSB report here
http://www.atsb.gov.au/publications/...904538_001.pdf
