Flyer
Topic Author
Posts: 57
Joined: Mon May 31, 1999 1:40 am

Taxiing Heavy Jets

Mon Jul 26, 1999 1:43 am

I was curious on how larger jets taxi from the gate to the runway. After pushback, do they use the engine to move foward, or is their something else that actually makes the wheels move foward, like in a car?

Thanx!
 
JETPILOT
Posts: 3094
Joined: Tue May 18, 1999 6:40 am

They Use Engine Power (nt)

Mon Jul 26, 1999 1:48 am

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Gnomon
Posts: 894
Joined: Thu Jun 03, 1999 12:38 pm

How Airplanes Move

Mon Jul 26, 1999 2:58 am

Ok, this is Chapter One of "All About Airplanes". No airplane has any kind of transmission mechanism, like cars do to turn the wheels on the ground. The wheels on a real airplane are just like wheels on an airplane model: they turn when a force is applied to cause the airplane to move. The engines supply that force. All airplanes, Piper Cubs and Boeing 747s alike, use their own engine power to taxi. Generally, airliners do not all of their running engines for taxi in order to save fuel and wear and tear on the engines.
 
Guest

RE: Taxiing Heavy Jets

Mon Jul 26, 1999 3:18 am

Can you say "thrust?"
 
stlbham
Posts: 438
Joined: Mon May 24, 1999 11:24 am

Taxi Speed?

Tue Jul 27, 1999 2:37 am

What is the taxi speed for jet aircraft at major airports?

Thanks
Brian
 
Guest

RE: Taxiing Heavy Jets

Tue Jul 27, 1999 3:06 am

KIDDI HOUR! my son use to think that when he was 6. and the taxi speed is fast enought to get where you are going bu not so fast you cant stop or hit something  
 
Buff
Posts: 1066
Joined: Fri Mar 16, 2007 1:29 pm

RE: Taxiing Heavy Jets

Tue Jul 27, 1999 1:22 pm

Our Company's standard operating procedure for the B-757 states a maximum taxi speed of 20 kts forward in a straight line, and 10 knots while turning. Speed can be monitored on the IRS G/S read-out.

I think most large jets use similar criteria. And as posted above, whether it's an ultra-light or an ultra-heavy - one must always be able to stop quickly. So every situation is different - slipperiness of taxiing surface, slope, weather conditions, whether on a ramp or long taxiway, etc.

Hope that helps,

Best Regards,

Buff
 
Guest

RE: Taxiing Heavy Jets

Wed Jul 28, 1999 3:42 am

One time the pilot let me into the cockpit for taxi at colorado springs. We just arrived from DEN. It was a 757. I looked at the speed indicator and it was 30 knots. Im serious. We were on taxiway E. taxiing to gate 11 from rnwy. 17L.
 
User avatar
Bruce
Posts: 4934
Joined: Tue May 18, 1999 2:46 am

To: UAL1636

Wed Jul 28, 1999 5:26 am

I thought Flight cRews weren't supposed to allow pax. in the cockpit when they are underway....in the United States. How did you manage to do that ?
Bruce Leibowitz - Jackson, MS (KJAN) - Canon 50D/100-400L IS lens
 
lima
Posts: 1090
Joined: Sun May 30, 1999 11:37 am

Qantas/Wunala Dreaming

Wed Jul 28, 1999 6:11 am

Is it possible to know which airports is Qantas´ Wunala Dreaming 747-400 scheduled to visit in the next month or so. I live in Buenos Aires and would like to know if they plan to use it any day so I can go and see it.

Thanks.
 
Buff
Posts: 1066
Joined: Fri Mar 16, 2007 1:29 pm

RE: To UAL1636

Wed Jul 28, 1999 7:23 am

When you were watching the "speed indicator", were you looking at the Airspeed Indicator, or the G/S readout on the EADI?

During my posting above, I stated the maximum taxi speed for our Company was 20 kts on a straight ahead path. Other companies may have different guidelines. From the way you described this aircraft's taxi path, 30 knots does not seem extraordinary.

If in fact it was the Airspeed Indicator you were watching, there could have been a wind outside that produced a higher or lower reading from your actual G/S as determined by the IRS units.

Hope that helps,

Best Regards,

Buff
 
Guest

RE: Taxiing Heavy Jets

Sun Aug 01, 1999 10:07 am

The 747-400 I flew on last night taxied to the runway at HNL at 12-14 mph. The moving map displayed the groundspeed while we were taxiing out.

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