QFTJT
Topic Author
Posts: 254
Joined: Mon Dec 18, 2000 7:56 pm

Powerbacks From Terminal

Thu Jan 04, 2001 12:33 pm

Hi all,

I was recently viewing a video recorded at Dulles D.C; I noticed AA MD80's using reverse thrust to get off the ramp. Is this common practice? Do any other types of aircraft or airlines use this procedure?

Thanks

MM
 
iflycoach
Posts: 973
Joined: Sat Aug 19, 2000 1:37 pm

RE: Powerbacks From Terminal

Thu Jan 04, 2001 12:45 pm

This was discussed before I believe, I don't know to much about the subject the only thing I can tell you is that or what I remember is that only aircraft that have there jets on the tail can do it and none of the planes with their engines under the wing could do it because of sucking up all sorts of stuff sitting on the ground. I also do think it puts stress on the wing although don't quote me on that one.
 
wilcharl
Posts: 1153
Joined: Sun Jun 25, 2000 11:19 am

RE: Powerbacks From Terminal

Fri Jan 05, 2001 2:09 am

It was discussed in great detail before, you can do a search for it, AA tried powering back 757s and it was common at EA. The old frontier did it all the time with 737s and so did AirFlorida, one of the contributing factors to the palm 90 accident. The concern is for FOD injesetion.
 
vikke
Posts: 15
Joined: Tue May 23, 2000 8:06 pm

RE: Powerbacks From Terminal

Fri Jan 05, 2001 3:15 am

Hello QFTJT,
Finnair uses power pushbacks with ATR72's to reverse out from jetway gates. It's prohibited to use this procedure with other types because trust-reversers are designed to slow aircraft on landing roll NOT pull out from gates.

Vikke
 
ferdinand
Posts: 11
Joined: Wed Dec 30, 2009 4:24 pm

RE: Powerbacks From Terminal

Fri Jan 05, 2001 7:13 am

The application of reverse thrust to push the airplane backwards is usually not used and, as far as I know,
also not integrated in normal operation procedures
used by bigger airlines. The danger of tail tipping is
too large if brakes are applied to stop the rearward motion.
F.
 
wilcharl
Posts: 1153
Joined: Sun Jun 25, 2000 11:19 am

RE: Powerbacks From Terminal

Fri Jan 05, 2001 9:56 am

correct me if im wrong but during powerback all 4 feet are on the floor so there is no chance of accidnetly hitting the pedals as the gut reaction to stop would be to hit them rather then go into forward power. again, Northwest, American, Airtran reguarly use powerbacks. Not only is it extra equipment to have a pushback it retires training and certifying the pushback driver, with douglas aircraft hooking up the towbar and disconeting it is a pain, boeing aircraft have a much better design for the tow bar, but not all -200 737s have a lockout, turn the hydralic pumps on and the tow bar if connected to the tug will snap the sheer pin, if its not connected it will become a dangerous weapon swinging aroudn potentialy breaking the poor ground crewmembers leg





s
 
vikke
Posts: 15
Joined: Tue May 23, 2000 8:06 pm

RE: Powerbacks From Terminal

Sat Jan 06, 2001 2:52 am

Wilcharl you are right about those potential hazards when using towbar and tug, but there are several manufacturers for towbarless towtugs. Towbarless tugs clamp on a/c's nosewheel and lifts it (nosewheel) up for pushback.
In my opion it's much faster way to move a/c out from gate than using reverse trust because during pushback or -out engines can be started rather than first start engines and after that power out from gate. If pushback distance is relative short, pushback is probably completed before engines are running and stabilized.

vikke

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