Jcxp15 From United States of America, joined Jun 2001, 997 posts, RR: 4
Reply 1, posted (13 years 9 months 1 week 4 days 10 hours ago) and read 8608 times:
As far as I know it's not possible for planes to use reversers in flight. There is a safety mechanism which prevents this. Wasn't there that theory about Swissair 111 about how the reversers went off, being the cause of the crash? This has obviously changed. From what I know, reversers in flight can be catastrophic.
Tg 747-300 From Norway, joined Nov 1999, 1318 posts, RR: 0
Reply 2, posted (13 years 9 months 1 week 4 days 9 hours ago) and read 8574 times:
I think its the Lauda 767 accident near Bangkok ,Thailand that you are remembering. If I'm not wrong one of the thrust reversers deployed during climb, causing one engine to reverse and the other to push foreward. And wasn't tha crew a litle unsure about whatwas going on?
Ivo21 From Netherlands, joined Jan 2002, 25 posts, RR: 0
Reply 6, posted (13 years 9 months 1 week 4 days 8 hours ago) and read 8504 times:
The thrust reverse system can only be used when the antiskid/autobrake system senses a ground mode. The autobrake system can use the reverse thrust if needed for the set deceleration rate. As far as I know the thrust reversers cannot be used in flight.
TurbineBeaver From United States of America, joined Jan 2002, 1199 posts, RR: 0
Reply 7, posted (13 years 9 months 1 week 4 days 8 hours ago) and read 8487 times:
Guys, my memory is vague, BUT...
Isn't this the main plot in...Michael Crichton's(??) novel, Airframe about the Norton 11 or some sort of airplane over the pacific? It's been about 4 years since I read the book, so I can't remember completely.
Starship From South Africa, joined Nov 1999, 1098 posts, RR: 13
Reply 8, posted (13 years 9 months 1 week 4 days 6 hours ago) and read 8458 times:
The Boeing C-17 Globemaster III has four Pratt & Whitney PW2040 series turbofans equipped with directed-flow thrust reversers capable of deployment in flight.
I think I have something on video somewhere, where they state that with the use of in flight thust reversers, the C-17 can descend at the rate of 16 000 ft/min and then land in as little as 1 400 ft. Mighty impressive and worthy of its 22 world records.
Shaun3000 From United States of America, joined Mar 2002, 445 posts, RR: 0
Reply 10, posted (13 years 9 months 1 week 4 days 3 hours ago) and read 8415 times:
Yes, Hurricane, _Airframe_ revolved around an inflight slat deployment.
In regards to thrust reversers in flight, I recall reading a thread on this forum a while back where some guy was on a 737-200 that had to make an emergencey decent. He said the pilot had full spoilers and thrust reverse, among other things, to slow the plane during the very rapid decent.
Skyguy11 From , joined Dec 1969, posts, RR:
Reply 11, posted (13 years 9 months 1 week 4 days 1 hour ago) and read 8400 times:
There is a modified Gulfstream NASA uses to train their Space Shuttle pilots. They go up really high (I forgot the specifics of it) and deploy spoilers and full reverse thrust to simulate the glide ratio of a Space Shuttle (some glider!).
Miles_mechanic From Canada, joined Sep 2001, 138 posts, RR: 0
Reply 12, posted (13 years 9 months 1 week 3 days 23 hours ago) and read 8390 times:
I saw the article on CNN about the shuttle training aircraft, they said that the modified Gulfstream goes up to 40,000 ft., and about 4 miles out and does there approach to the runway with the reverser thrust engaged. They showed the view from inside as they performed the manouver, what a ride that must be. They don't take the reverse thrust off until they are over the runway, but the pilot said they could land with them still deployed. The airplane has special computer controls installed to ensure that both engines are putting out the same thrust in reverse so they don't loose control of the airplane.
Jetguy From , joined Dec 1969, posts, RR:
Reply 14, posted (13 years 9 months 1 week 3 days 20 hours ago) and read 8355 times:
Oh by the way, on the NASA Gulfstream Shuttle trainer, they also extend the main landing gear for additional drag. What a ride that must be - spoilers, main landing gear, and full reverse thrust...
Positive rate From Australia, joined Sep 2001, 2143 posts, RR: 1
Reply 15, posted (13 years 9 months 1 week 3 days 19 hours ago) and read 8333 times:
Reverse- thrust is available on some a/c types in flight. DC-8/NASA Gulfstream jet and possibly the 747. However it is not possible on a twin engine jet like a 767 because the engines are too far inboard and they would get wrenched off and the plane would break apart(Lauda Air 767-300ER in 1991). There is however a recovery manouver for pilots in case the reversers do inadvertently deploy- about a 3 sec window from reverser deployment to airframe failure for the pilots to take action!
Vc10 From United Kingdom, joined Nov 2001, 1432 posts, RR: 14
Reply 16, posted (13 years 9 months 1 week 3 days 18 hours ago) and read 8329 times:
In my experience most aircraft whether prop or pure jet have a built in automatic protection system which will prevent the engine going into reverse thrust in the air, or should that happen then the engine power will be reduced to idle power. Now some aircraft have a system which at the pilots command overrides that ptotection system and allows certain engines to go into reverse thrust usually at very low powers while the aircraft is airbourne.
From my own experience an engine inadvertantly going in reverse in flight is not always a disaster as is shown by my own example when flying a VC-10 at 35,000ft when the No 3 engine [and on a Vc-10 that is quite inboard ] decided to go into reverse. The auto protection system immediately reduced the power to idle thrust, and in fact it was all to much for the engine which flamed out. Yes the situation was not very pleasant and not to be repeated by choice , but the aircraft landed on time and I seem to remember it departed only slightly late [ Due reverser being locked out ]
Just for interest the Concorde once it is below Mach 1 and I believe 30,000ft can select it's two inboard engines into reverse thrust at idle power. This is usually done so as to increase the rate of descent, which with idle reverse in will be about 10,000ft per min.
Starship From South Africa, joined Nov 1999, 1098 posts, RR: 13
Reply 17, posted (13 years 9 months 1 week 3 days 12 hours ago) and read 8282 times:
L-188 is quite correct about the IL-62 deploying thrust reversers in the air. However after scanning through a few hundred pics in the database, I came to the conclusion that the thrust reversers are deployed only seconds before touchdown. The pic I really wanted I haven't found yet, but I'll carry on looking. In the mean time, here are two illustrating deployed TR's in flight.
727pfe From , joined Dec 1969, posts, RR:
Reply 21, posted (13 years 9 months 1 week 3 days 4 hours ago) and read 8211 times:
The DC-9 can deploy the reversers inflight. There is no mechanical linkage to prevent the thrust reversers from deploying. That's not to say that it's a procedure. The same was true with the 707. Forbidden by the manual, but nothing mechanical to prevent inflight actuation.
Expratt From United States of America, joined Mar 2000, 311 posts, RR: 0
Reply 22, posted (13 years 9 months 1 week 3 days 1 hour ago) and read 8206 times:
The DC-8s were originally certificated to permit inflight deployment of the T/Rs. But I thought the FOM was revised to prohibit the inflight use of the T/Rs after two crashes where crews deployed the T/Rs on final approach at low altitude. One crash was Alitalia at JFK and I believe the other was IB at BOS. I think both had similar circumstances and outcomes. The airplane broke out of the clouds and were high on the glide slope on short final. The captains did not want to go around and deployed the T/Rs that caused a very high sink rate causing the airplanes to land short and hard. Both airplanes broke up into three pieces, but did not burn. There were several injuries, but no fatalities.