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Push Back Right To The Runway? The Idea?  
User currently offlineJulesmusician From , joined Dec 1969, posts, RR:
Posted (8 years 7 months 3 weeks 5 days 1 hour ago) and read 3526 times:

It may have been already discussed but surely being pushed back then detaching the aircraft and letting it go under its own engine power into a lengthy queue before take off is far less economical than being pulled all the way to the runway? Has there ever been some sums done to work out the cost of idleing in a long waiting queue for take off on a busy morning from a major city airport to a tug taking you all the way to the runway and then detaching?

9 replies: All unread, jump to last
 
User currently offlineSfomb67 From United States of America, joined Dec 2005, 417 posts, RR: 0
Reply 1, posted (8 years 7 months 3 weeks 5 days ago) and read 3513 times:

Problem I see, is that everyone would have to do this. Wouldn't want to be on a tug behind a plane taxing under its own power. I'm sure there's lots of other reasons....manpower, Congestion, etc.


Not as easy as originally perceived
User currently offlineAirfoilsguy From , joined Dec 1969, posts, RR:
Reply 2, posted (8 years 7 months 3 weeks 5 days ago) and read 3511 times:

I thought the same but then realized it would be a huge expenditure of man power and extra equipment. Now a car wash conveyer type of thing would be interesting.

User currently offlineTheSorcerer From United Kingdom, joined Oct 2005, 1048 posts, RR: 0
Reply 3, posted (8 years 7 months 3 weeks 5 days ago) and read 3489 times:

Depending on where they started their engines it could block the runway for longer than necessary. If the A/C starts it's engines on the Runway it would take a lot longer for it to take off and clear the runway. Longer holds for approaching A/C and potentially more Go arounds would maybe be a
by-product.
Dominic



ALITALIA,All Landings In Torino, All Luggage In Athens ;)
User currently offlineDw747400 From United States of America, joined Aug 2001, 1260 posts, RR: 1
Reply 4, posted (8 years 7 months 3 weeks 4 days 23 hours ago) and read 3466 times:

Not to mention you need either an engine or APU for electrical/hydraulic power.


CFI--Certfied Freakin Idiot
User currently offlineArmitageShanks From UK - England, joined Dec 2003, 3625 posts, RR: 15
Reply 5, posted (8 years 7 months 3 weeks 4 days 16 hours ago) and read 3383 times:

Engine warm up time and system checks that can only be done with engines on, too.

User currently offlineHAWK21M From India, joined Jan 2001, 31684 posts, RR: 56
Reply 6, posted (8 years 7 months 3 weeks 4 days 12 hours ago) and read 3347 times:

Unnecessary buildup of GSE on the busy path to the runway.Also in case of any detected problem it would lead to considerable delay.
regds
MEL



Think of the brighter side!
User currently offlineVc10 From United Kingdom, joined Nov 2001, 1411 posts, RR: 15
Reply 7, posted (8 years 7 months 3 weeks 4 days 8 hours ago) and read 3318 times:

In the early days of Concorde's operation to Washington from London before all the fuel saving mods were done, serious consideration was given to towing the aircraft to the end of the runway before starting the engines so as to save fuel. I think it was only ever done once as the congestion was enormous

little vc10


User currently offlineIAHFLYR From United States of America, joined Jun 2005, 4790 posts, RR: 22
Reply 8, posted (8 years 7 months 3 weeks 4 days 6 hours ago) and read 3293 times:

Quite often aircraft don't depart in the same order that they are in que. This is done at airports that stagger the way an aircraft turns after departure to expedite such as first turns 15 deg left second goes runway heading next turns 15 deg right (US radar separation standard). So if the 4th aircraft is tugging to the runway and they are going a different direction than the other 3 in front they would be rushed to unhook the tug and get started and warmed.......at some airports the concept could work but at most probably not let alone the congestion in the hammer head with all the tugs wandering around, someone would cross an active runway without a clearance at some point.


Any views shared are strictly my own and do not a represent those of any former employer.
User currently offlineJetstar From United States of America, joined May 2003, 1648 posts, RR: 10
Reply 9, posted (8 years 7 months 3 weeks 3 days 17 hours ago) and read 3207 times:
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The nose gear struts are not designed to take the load and stress of long distance towing or push backs on a fully loaded airplane.

While the gate parking areas of airports are almost flat, many airports have dips and rises along the taxiways. The stress on the nose gear structure over a period of time could lead to premature failures of the nose gear.


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