Thrust From United States of America, joined Sep 2003, 2691 posts, RR: 9 Posted (10 years 8 months 2 weeks 6 days 9 hours ago) and read 4410 times:
Both times that I flew a 777, which was for AA, I noticed that the landing was different than any other type of aircraft before it. For some reason, the roar that we typically hear when the thrust reversers of an aircraft are applied on the runway was not present with the 777. The only thing I heard and felt was the thump of the landing gear on the runway and the aircraft slowing down...the noise literally remained the same the whole way through the landing...you could've sworn that the aircraft was still flying. Anyway, getting to my question, I wanted to know what in the world makes these thrust reversers add little or no noise to the aircraft when deployed on landing? How on earth can such powerful engines be so quiet on landing?
Klaus From Germany, joined Jul 2001, 21592 posts, RR: 53
Reply 2, posted (10 years 8 months 2 weeks 6 days 9 hours ago) and read 4357 times:
I remember an explanation given earlier by pilots that they frequently deploy the reversers without revving up the engines again ("idle reverse"). That would give only marginal braking assistance (so the brakes have to work harder), but there is much less noise to the environment than in "full reverse". It seems many airports recommend this mode of operation for their neighbours´ sake.
CdfMxTech From United States of America, joined Jul 2000, 1341 posts, RR: 26
Reply 5, posted (10 years 8 months 2 weeks 6 days 7 hours ago) and read 4226 times:
The B777 is equipped with carbon brakes. Carbon brakes are much more effective when they are heated up. For this reason, the Thrust Reversers are deployed, but left in Idle reverse. This can extend the life of the engine (less High EGT ) and decrease the chances of FOD damage.
Lorm From United States of America, joined Jun 2004, 410 posts, RR: 1
Reply 8, posted (10 years 8 months 2 weeks 6 days 4 hours ago) and read 4154 times:
If there's a long runway, it's not high traffic hour, and the 777 you're on doesn't need to vacate the runway early, chances are they won't use reversers. Like the replies above, the 777 has very effective carbon brakes. I remember the first time I flew on the 777, landing in ORD several years ago, I was so surprised that landing on 22R we never utilized thrust reversing.
My last 2 trips in June, on legs flown with the 777 we used thrust reversers once. On my ORD-SFO on UA137, that leg we flew an international equipped 777 and I was seated in 1J in F/C. Upon landing on 28R I could hear only slightly the wind noise from the cascades opening up. Sometimes it is less obvious if you're sitting up front ahead of the engines.
Last leg to HNL on UA61 which arrived around 4pm, we landed on 4R, not commonplace as usually before 630p, the majority of heavy jet traffic lands on 8L. Anyways on 4R the normal practice is to roll down to the end and then do a turnoff, which we did without reversers deployed. Still with 9000' of runway we were out of autobraking and coasting before we crossed 8L, so we easily slowed down even with a full load of passengers. I had to sit near the engine at 22J and even idle reverse wasn't used.
Aaron747 From Japan, joined Aug 2003, 8495 posts, RR: 26
Reply 9, posted (10 years 8 months 2 weeks 6 days 2 hours ago) and read 4120 times:
I flew AA SJC-NRT and back last March, and noticed this upon arrival. We came in on 34L on a rainy day and touched down a bit long but still didn't use anything more than idle reverse. 34L/16R has at least 11,000' of landing distance though so we simply braked for a bit and exited one of the high speeds for the short jaunt to the terminal.
Coming back to SJC however, we were hot the whole way down to 30L and came down a bit long. There was definitely reverse thrust applied as we slowed *very* quickly.
If you need someone to blame / throw a rock in the air / you'll hit someone guilty
Star_world From Ireland, joined Jun 2001, 1234 posts, RR: 0
Reply 11, posted (10 years 8 months 2 weeks 3 days 23 hours ago) and read 3710 times:
I've noticed this many times at LHR in early mornings, I usually leave my car in the car park right next to 27R - probably only a few hundred metres from the runway itself. I've seen 777s land right next to me with virtually no noise - quiet enough that you probably wouldnt notice it unless you were looking! They always had the thrust reversers deployed, but with just idle reverse in use.
Thrust From United States of America, joined Sep 2003, 2691 posts, RR: 9
Reply 12, posted (10 years 8 months 2 weeks 3 days 13 hours ago) and read 3612 times:
I must confess, SimProgrammer, my first route on a 777 was on AA, BOS-LHR. We touched down at LHR at about 6:00 A.M. in the morning London time. But strangely enough, when I flew LHR-JFK like a week later, we landed at JFK during a perfectably sociable hour, like late afternoon or early evening, New York time. the second landing was no different from the first other than that we were landing at JFK instead of LHR.
Ba299 From United Kingdom, joined Jun 2003, 173 posts, RR: 1
Reply 15, posted (10 years 8 months 5 days 18 hours ago) and read 2861 times:
Often you don't heard the T/R because we use it only at idle. Using the autobrakes the aircraft stop in the same distance with o without reverses. So we prefer (when we can) to avoid the use on the reverses for noise abatement and for more comfort of the paxx.