reverse before touch down
I do not know how old this video is and apologies if it has been discussed before , but purely out of curiosity can you put reverse in flight on the MD80 . I know you could do it on the DC8 on the inboards to increase rate of descent , or even on all 4 on the CV990, but never heard it of newer types .
video here : |
Certainly looks like it.
You can on the 737 too. |
Originally Posted by ATC Watcher
(Post 10402632)
I do not know how old this video is and apologies if it has been discussed before , but purely out of curiosity can you put reverse in flight on the MD80 . I know you could do it on the DC8 on the inboards to increase rate of descent , or even on all 4 on the CV990, but never heard it of newer types .
video here : MD80 reverse in addition to the above, although I believe that on the MDs it is possibile to deploy the reverse at low radio alt, in this specific video You can see the aircraft experiencing a low bounce and then deploying the reversers. |
You can on the 737 too. |
Prohibited but possible below 10 ft RA on the 737 NG. |
plus Trident and TU-154 and IL62 iirc
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And Concorde.
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Originally Posted by Johnny F@rt Pants
(Post 10402669)
Below 10 feet RA. |
plus Trident and TU-154 and IL62 .... and Concorde |
There was a thread about a while back on this.
https://www.pprune.org/tech-log/5165...hlight=reverse Don't try it in a turboprop though. https://en.m.wikipedia.org/wiki/Nort...nk_Flight_2268 https://en.m.wikipedia.org/wiki/Luxair_Flight_9642 |
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Originally Posted by sonicbum
(Post 10402653)
Hi,
I believe that on the MDs it is possibile to deploy the reverse at low radio alt, |
Originally Posted by EXDAC
(Post 10402992)
I don't see anything on the schematic that would prevent reverser deployment in flight.
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I was flight lead on an MD-80 series commercial airline trainer a long while ago. Unless there has been a mod since then, the reverser deployment command will not go true unless a main landing gear squat switch is made. In the video, the left main gear is seen to touch down briefly and the reversers deploy shortly after that. It appears to me that the reverser levers must have been in the reverse position, and the first bounce enabled the deployment. A lower order possibility is that one of the main landing gear squat switches was failed closed.
In any case, airborne deployment of the reversers is not a normal operation for the MD-80. It is possible for the lower reverser bucket to strike the ground if the deployment sequence occurs with the main gear on the ground at higher pitch angles where the nose gear is not on the ground - adding code to detect this was the last change made before the trainer received FAA certification. |
[QUOTE=twb3;10403017the reverser deployment command will not go true unless a main landing gear squat switch is made. [/QUOTE]
There is no "reverser deployment command" in the actual aircraft. The system is a mechanical linkage between the throttle quadrant and the reverser control valves. |
Could on the HS780.
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Originally Posted by EXDAC
(Post 10403027)
There is no "reverser deployment command" in the actual aircraft. The system is a mechanical linkage between the throttle quadrant and the reverser control valves.
The 737 uses radio altimeter for the air/ground because it has a tendency to float in ground effect and the squat switch doesn't activate - the others use the squat switch. |
Originally Posted by tdracer
(Post 10403081)
Boeing put the air/ground on the hydraulic isolation valve (HIV), .
https://www.ntsb.gov/investigations/...ts/AAR8116.pdf |
Also done by pilots on the 747s to land on short runways.
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Here is the 737 video: |
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