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Taxiing Heavy Jets  
User currently offlineFlyer From Canada, joined May 1999, 32 posts, RR: 0
Posted (15 years 5 months 1 week 1 day 12 hours ago) and read 833 times:

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!

11 replies: All unread, jump to last
 
User currently offlineJETPILOT From United States of America, joined May 1999, 3130 posts, RR: 29
Reply 1, posted (15 years 5 months 1 week 1 day 12 hours ago) and read 831 times:

<

User currently offlineGnomon From , joined Dec 1969, posts, RR:
Reply 2, posted (15 years 5 months 1 week 1 day 11 hours ago) and read 831 times:

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.

User currently offlineUnited946 From , joined Dec 1969, posts, RR:
Reply 3, posted (15 years 5 months 1 week 1 day 11 hours ago) and read 831 times:

Can you say "thrust?"

User currently offlineStlbham From United States of America, joined May 1999, 443 posts, RR: 0
Reply 4, posted (15 years 5 months 1 week 11 hours ago) and read 831 times:

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

Thanks
Brian


User currently offlineBosman From , joined Dec 1969, posts, RR:
Reply 5, posted (15 years 5 months 1 week 11 hours ago) and read 832 times:

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  


User currently offlineBuff From Australia, joined Mar 2007, 0 posts, RR: 1
Reply 6, posted (15 years 5 months 1 week 1 hour ago) and read 832 times:

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


User currently offlineUal1636 From , joined Dec 1969, posts, RR:
Reply 7, posted (15 years 5 months 6 days 10 hours ago) and read 831 times:

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 currently offlineBruce From United States of America, joined May 1999, 5067 posts, RR: 15
Reply 8, posted (15 years 5 months 6 days 9 hours ago) and read 831 times:

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
User currently offlineLima From Argentina, joined May 1999, 1122 posts, RR: 14
Reply 9, posted (15 years 5 months 6 days 8 hours ago) and read 831 times:

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.


User currently offlineBuff From Australia, joined Mar 2007, 0 posts, RR: 1
Reply 10, posted (15 years 5 months 6 days 7 hours ago) and read 832 times:

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


User currently offlinePurdue Cadet From , joined Dec 1969, posts, RR:
Reply 11, posted (15 years 5 months 2 days 4 hours ago) and read 832 times:

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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