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  • 3

Gulfstream with Reversers in the air?

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Look closely at the engine! Why would they do this?? Am i missing something? (flightaware.com) 更多...

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frank1711
frank1711 1
FYI - Link to pics of NASA N944NA STA (Shuttle Tranining Aircraft)
http://flightaware.com/photos/aircraft/N944NA

Link to a feature on the STA
http://www.nasa.gov/mission_pages/shuttle/flyout/flyoutSTA.html
linbb
linbb 1
Kind of hard to do in the air on normal ones as they have squat switches to prevent in flight deployment. NASA is rigged special so they can do it in flight for the reason listed only. So the bottom line is you cannot in a normal one so it cant drop like a rock. Way back when they had props and recips they didnt have lockouts and some airline crew decided to see what would happen. I think they landed ok but took care of a pilots airline days. Check think that you can find it remeber it from my A&E training days.
bizjets101
biz jets 1
Clearly this Gulfstream G1159A manufactured in 1969 does not have WOW sensors - as you can clearly see, the aircraft does not have the wheels on the ground, thus the weight of the aircaft clearly is not on the wheels and the thrust buckets are fully deployed.
preacher1
preacher1 1
I wonder if there are sensors or something to detect altitue that will allow deployment that low. While not on the ground, he is obviously flared and only a tad off the ground. Waiting for touchdown and then spool 'em back up???????
bizjets101
biz jets 1
No,because this GII was built in the 60's it predates the Weight on Wheels WOW sensors.
Here is an example of a Russian Tu-154 deploying thrust reversers prior to touchdown.

PS; excellent photo of the GII in this thread, and great spotting noticing it, appreciate you posting it on squaks - rob
jackieman27
jackieman27 1
Thank you! Thanks for responding!
bizjets101
biz jets 1
https://www.youtube.com/watch?v=Yq5HLtdGeqE
preacher1
preacher1 1
Hard to tell on the video on the TU154. Looks like he dropped the buckets but the engines don't appear to have spooled back up until touchdown, at least the mains down. Looks like the nose may have been up a tad. The WOW sensors are OK I guess to prevent an accidental mid air deplowyment, but they rob you of a little bit of stopping distance by having to wait until you are completly down to deploy reverse thrust.IMHO
bizjets101
biz jets 1
Niki Lauda's Lauda Air had a Boeing 767 crash due to deployment of a thrust reverser in flight 'for unknown reasons'.

http://aviation-safety.net/database/record.php?id=19910526-0

Unfortunately the downside of WOW sensors was the recent Tu-204 in Moscow and the Lear 60 N999LJ (Travis Barker) accident where these aircraft where producing too much lift while on the runway - so enough of the aircrafts' weight is not on the main gear - so thrust buckets wouldn't deploy.
preacher1
preacher1 1
I was a thinkin' that most AC just had WOW on the nose anyway and it was just set on contact rather than weight;ie. just minor depression of strut.
bizjets101
biz jets 1
Not common practice, but no problem in a Gulfstream II, NASA would fire their thrust buckets in flight to mimic the Space Shuttle landings.
One warning, under 250 miles per hour in a GII no problem, but it'll drop you like a rock!!

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