Tesko
Topic Author
Posts: 18
Joined: Tue Jul 08, 2008 7:02 am

Quick Question About The Taxi Stage Of Flight.

Fri Jul 31, 2009 9:11 am

Alright, when a pilot of a heavy is on a taxi does he manage all the throttles as separate throttles of which way he is turning or does he manage all the engines as one?
 
User avatar
Starlionblue
Posts: 17049
Joined: Fri Feb 27, 2004 9:54 pm

RE: Quick Question About The Taxi Stage Of Flight.

Fri Jul 31, 2009 9:56 am

As I understand it it is all as one with the possible exception of some very tight turns where you might want more power on the outside of the turn.
"There are no stupid questions, but there are a lot of inquisitive idiots."
 
User avatar
thebatman
Posts: 835
Joined: Sun Aug 05, 2007 12:15 am

RE: Quick Question About The Taxi Stage Of Flight.

Sun Aug 02, 2009 1:55 am



Quoting Starlionblue (Reply 1):
As I understand it it is all as one with the possible exception of some very tight turns where you might want more power on the outside of the turn.

I'll have to kindly disagree. I'm not a pilot, but I do taxi every fleet type that my airline has (737,747,757,767,777,A319,A320). If you're on the taxi stage of flight, especially in a heavy airplane, the tendency to "die" in a turn is much higher than when you're arriving at your destination and have little fuel left. It is common practice to pull a little power on the corresponding engine to help you make a smooth turn. You could move all of the throttles at the same time, but this may cause you to speed up too rapidly, and then you'd have to hit the brakes. Again, it's much smoother to pull power only on the side you need.
Aircraft mechanics - because pilots need heroes too!
 
411A
Posts: 1788
Joined: Mon Nov 12, 2001 10:34 am

RE: Quick Question About The Taxi Stage Of Flight.

Sun Aug 02, 2009 2:16 am

I depends on what the Captain decides...personally, when heavy (which is nearly always for us, for departure) I will use the outboard engine in turns.
Type, L1011.
 
CosmicCruiser
Posts: 2049
Joined: Tue Feb 22, 2005 3:01 am

RE: Quick Question About The Taxi Stage Of Flight.

Sun Aug 02, 2009 2:19 am



Quoting Thebatman (Reply 2):
I'm not a pilot, but I do taxi every fleet type that my airline has

OOOOOOOKAY

In the MD-11 as well as the DC-10 I rarely use assymetrical thrust in a turn. The "feel" you get is to KNOW that the momentum you have will take you thru the turn. When I first checked out in the -10 years ago I remember bogging down in an uphill turn because I didn't have the feel of the inertia yet. Now almost never is it a factor, I see the turn, look at the GS and know what thrust I'll need to make the turn. If I use one side more than the other it's rare.
 
User avatar
thebatman
Posts: 835
Joined: Sun Aug 05, 2007 12:15 am

RE: Quick Question About The Taxi Stage Of Flight.

Tue Aug 04, 2009 3:23 pm



Quoting CosmicCruiser (Reply 4):
OOOOOOOKAY

Questions??
Aircraft mechanics - because pilots need heroes too!
 
User avatar
Francoflier
Posts: 3688
Joined: Wed Oct 31, 2001 12:27 pm

RE: Quick Question About The Taxi Stage Of Flight.

Tue Aug 04, 2009 6:21 pm

The general practice is to accelerate all engines simultaneously for taxi. The use of asymetical thrust would only be used in case of an extremely tight turn at low speed. The steering system on modern airliners is more than able to turn the nosewheel to full lock at a standstill.

Whenever taxying around an airport with a heavy jet you need to try and apply as little thrust as possible to avoid FOD behind you, and in that way it is better to use more engines at less thrust than one at a higher thrust.
I'll do my own airline. With Blackjack. And hookers. In fact, forget the airline.
 
CosmicCruiser
Posts: 2049
Joined: Tue Feb 22, 2005 3:01 am

RE: Quick Question About The Taxi Stage Of Flight.

Tue Aug 04, 2009 7:33 pm



Quoting Thebatman (Reply 5):
Questions??

My first thought was just MSFS but I see by your profile you're a line mech. Cool. Do they teach assymetrical thrust in the turns?
 
User avatar
thebatman
Posts: 835
Joined: Sun Aug 05, 2007 12:15 am

RE: Quick Question About The Taxi Stage Of Flight.

Wed Aug 05, 2009 12:53 am



Quoting CosmicCruiser (Reply 7):
Do they teach assymetrical thrust in the turns?

Yes, they do...if it's necessary. If you're taxiing an A320 with 8000 lbs of fuel on board, you're not going to touch the throttles (hardly) during the entire taxi ride. Now, if you're taxiing a 747-400 with 375,000 lbs of fuel, that's a different story.

Quoting CosmicCruiser (Reply 4):
The "feel" you get is to KNOW that the momentum you have will take you thru the turn.

Absolutely. That's hard to describe to someone who has never done it. You have to walk the fine line between carrying enough power to go through the turn, and not applying too much and blowing something or someone behind you away. Since UA is really pushing single-engine taxi, that makes turning even more challenging. But, with time comes experience, and with experience, "feel".
Aircraft mechanics - because pilots need heroes too!
 
CosmicCruiser
Posts: 2049
Joined: Tue Feb 22, 2005 3:01 am

RE: Quick Question About The Taxi Stage Of Flight.

Wed Aug 05, 2009 1:00 am

Like I said I rarely do it though I've had to do a 180 on the runway and used every available tool including assymetrical thrust. On the -11 if you're heavy you may find yourself at max thrust( 40%N1) for a ramp or congested area. We have had some cans blown into other things like planes and carts, etc. Y'all be careful now.
 
User avatar
HAWK21M
Posts: 29867
Joined: Fri Jan 05, 2001 10:05 pm

RE: Quick Question About The Taxi Stage Of Flight.

Thu Aug 06, 2009 8:14 am



Quoting Thebatman (Reply 2):
I'm not a pilot, but I do taxi every fleet type that my airline has (737,747,757,767,777,A319,A320)

Is the Taxi permit issued per Aircraft type or over entire fleet.Here its the former.
regds
MEL.
I may not win often, but I damn well never lose!!! ;)
 
movingtin
Posts: 87
Joined: Sat Oct 21, 2006 1:03 am

RE: Quick Question About The Taxi Stage Of Flight.

Thu Aug 06, 2009 5:42 pm



Quoting HAWK21M (Reply 10):
Is the Taxi permit issued per Aircraft type or over entire fleet.Here its the former.
regds

Per A/C Type, with recurrent check rides required where i have worked.
 
User avatar
thebatman
Posts: 835
Joined: Sun Aug 05, 2007 12:15 am

RE: Quick Question About The Taxi Stage Of Flight.

Thu Aug 06, 2009 7:50 pm



Quoting HAWK21M (Reply 10):
Is the Taxi permit issued per Aircraft type or over entire fleet

You need to take two weeks of training for each A/C type (one week- systems training, and one week - engine run/taxi). Then you will need to go on a series of check rides for each A/C. Also, here at ORD you need to take a 150-question taxi exam for the city that tests you on all the runways, taxiways etc. You'd better know where you're going out there! That test gives you a special ID badge that allows you to taxi A/C.
Aircraft mechanics - because pilots need heroes too!
 
Valkyrie01
Posts: 52
Joined: Fri Mar 09, 2007 2:12 pm

RE: Quick Question About The Taxi Stage Of Flight.

Fri Aug 07, 2009 2:14 am



Quoting Thebatman (Reply 12):
You need to take two weeks of training for each A/C type (one week- systems training, and one week - engine run/taxi). Then you will need to go on a series of check rides for each A/C. Also, here at ORD you need to take a 150-question taxi exam for the city that tests you on all the runways, taxiways etc. You'd better know where you're going out there! That test gives you a special ID badge that allows you to taxi A/C.

Do you get pay extra to taxi airplanes i know alot of the guy i work with who are taxi qualify gave it up because they were not getting any additional money for it. ie more responsibility etc and no compensation.
The best there is the best there was the best there ever will be
 
User avatar
HAWK21M
Posts: 29867
Joined: Fri Jan 05, 2001 10:05 pm

RE: Quick Question About The Taxi Stage Of Flight.

Fri Aug 07, 2009 9:01 am



Quoting Valkyrie01 (Reply 13):
Do you get pay extra to taxi airplanes i know alot of the guy i work with who are taxi qualify gave it up because they were not getting any additional money for it. ie more responsibility etc and no compensation.

There is no Taxi check permit holder allowance out here...Its considered a part of the job.
regds
MEL.
I may not win often, but I damn well never lose!!! ;)
 
User avatar
thebatman
Posts: 835
Joined: Sun Aug 05, 2007 12:15 am

RE: Quick Question About The Taxi Stage Of Flight.

Fri Aug 07, 2009 3:53 pm



Quoting Valkyrie01 (Reply 13):
Do you get pay extra to taxi airplanes

Some carriers (only regionals that I'm aware of) will give you something like 25 cents more an hour for being taxi-qualified. This is NOT the case at the airline I work for.
Aircraft mechanics - because pilots need heroes too!

Who is online

Users browsing this forum: ACDC8, WIederling and 20 guests