Sponsor Message:
Aviation Technical / Operations Forum
My Starred Topics | Profile | New Topic | Forum Index | Help | Search 
Overweight Taxi Condition  
User currently offlineHAWK21M From India, joined Jan 2001, 31684 posts, RR: 56
Posted (10 years 7 months 3 weeks 3 days 13 hours ago) and read 1917 times:

What are the conditions that one would be Taxiing at a weight that is more than the maximum-design-taxi-weight (MTW).
regds
HAWK


Think of the brighter side!
11 replies: All unread, jump to last
 
User currently offlineUTA_FLYinghigh From Tunisia, joined Oct 2001, 6495 posts, RR: 50
Reply 1, posted (10 years 7 months 3 weeks 3 days 12 hours ago) and read 1889 times:

Dunno about MTW, but it is common procedure in airports with looong taxi/hold times for the crew to order extra fuel that actually places the aircraft over the MTOW (maximum take-off weight).
By the time the aircraft will be lined up and cleared for takeoff, the extra fuel will have been burnt off from the taxying/holding time.

Regards,
UTA



Fly to live, live to fly - Air France/KLM Flying Blue Platinum, BMI Diamond Club Gold, Emirates Skywards
User currently offlineFredT From United Kingdom, joined Feb 2002, 2185 posts, RR: 26
Reply 2, posted (10 years 7 months 3 weeks 3 days 11 hours ago) and read 1878 times:

Er... do you have evidence that this is done?

If it is a maximum weight, it is for a reason...

Cheers,
Fred



I thought I was doing good trying to avoid those airport hotels... and look at me now.
User currently offlineUTA_FLYinghigh From Tunisia, joined Oct 2001, 6495 posts, RR: 50
Reply 3, posted (10 years 7 months 3 weeks 3 days 11 hours ago) and read 1871 times:

I said MTOW, not max weight lol...
I shall (les Eaux) therefore look for evidence to substantiate my claims Big grin

UTA



Fly to live, live to fly - Air France/KLM Flying Blue Platinum, BMI Diamond Club Gold, Emirates Skywards
User currently offlineBuckfifty From Canada, joined Oct 2001, 1316 posts, RR: 19
Reply 4, posted (10 years 7 months 3 weeks 3 days 11 hours ago) and read 1867 times:

That's called MRW (Max Ramp Weight). However, if by the time you get to the threshold, and you are still over the MTOW, better turn on every appliance you got, and wait.

And I haven't heard of a single case where an aircraft would have taxiied with a weight greater than the MRW (or MTW, wherever that is used).

[Edited 2004-02-02 11:27:30]

User currently offline411A From United States of America, joined Nov 2001, 1826 posts, RR: 8
Reply 5, posted (10 years 7 months 3 weeks 3 days 7 hours ago) and read 1824 times:

Recall in the early 1960's, BOAC started B707 ops from LAX nonstop to LHR.
At the time, this was the longest nonstop jet transport route, and the operation was very limiting. 25L/07R had to be the departure runway (longest runway at the time, 12,000 feet) and the departure was at 10pm to be sure the ambient temperature was low.
Several times the aircraft arrived at the runway, only to have to sit there for awhile, burning off excess taxi fuel.

Found out just why some years later when I was flying these same particular 707 (non-fan) models...very long takeoff runs were the norm, and initial climb rate especially low.
AF started nonstop ORY service shortly thereafter, and would be 15+ miles west before reaching 2000msl.


User currently offlineBMAbound From Sweden, joined Nov 2003, 660 posts, RR: 4
Reply 6, posted (10 years 7 months 3 weeks 3 days 6 hours ago) and read 1775 times:

If my memory serves me correctly, the ramp weight of a C-172N is an enormous 7 lbs more than max take off weight.

Quite funny actually...

cheers

johan



Altitude is Insurance - Get Insured
User currently offlineFlightSimFreak From United States of America, joined Oct 2000, 720 posts, RR: 0
Reply 7, posted (10 years 7 months 3 weeks 3 days 4 hours ago) and read 1745 times:

Where did you get that information, BMAbound? I looked in my 172N POH and the only referance to something similar to that came in section 5 saying that the total fuel for start, taxi, and takeoff is 1.1 gallons. I do not see anything that gives maximum taxi weight.

User currently offlineUSAFHummer From United States of America, joined May 2000, 10685 posts, RR: 52
Reply 8, posted (10 years 7 months 3 weeks 3 days 3 hours ago) and read 1712 times:

Here are the weights as listed from my Cessna 172S info manual:

Max Ramp Weight: 2558 lbs.
Max Takeoff Weight: 2550 lbs.
Max Landing Weight: 2550 lbs.

So with 100LL weighing about 6 lbs. per gallon, the aircraft needs to burn off 1.33 gallons of gas at max weight before it can t/o

Incidentally, just how much of a difference would those 8 lbs make if one tried to take off at max ramp weight? Is it really that significant?

Greg



Chief A.net college football stadium self-pic guru
User currently offlineBen From Switzerland, joined Aug 1999, 1391 posts, RR: 50
Reply 9, posted (10 years 7 months 3 weeks 3 days 2 hours ago) and read 1695 times:

Incidentally, just how much of a difference would those 8 lbs make if one tried to take off at max ramp weight? Is it really that significant?

Probably not.. but that's a whole other can of worms. How big is the design safety margin? nobody but the designers know. Push it at your peril.

I doubt it would cause any problems, but if something did occur, it would invalidate the C of A and the insurance.

Light aircraft frequently operate over weight without any problems. To give you an idea of how 'accepted' it is, on my PPL skill test (we only have one skill test/check ride here, at the end) we were quite a bit over weight but the examiner gave me a symbolic weight to use for him, about half his real weight, just so the W&B calculation would work. So much for setting an example.


User currently offlineSkyguy11 From , joined Dec 1969, posts, RR:
Reply 10, posted (10 years 7 months 3 weeks 3 days 2 hours ago) and read 1691 times:

Flying overweight is not nearly as bad as flying out of CG limits; but it is the kind of thing where you don't know how much is too much until airborne... best to stick with the books.

User currently offlineBMAbound From Sweden, joined Nov 2003, 660 posts, RR: 4
Reply 11, posted (10 years 7 months 3 weeks 2 days 3 hours ago) and read 1604 times:

FlightSimFreak, on the very first page, where it says Performance and Specifications (looking at my POH for a 1979 C-172N), two Max weights are given, one for Ramp and one for T/O and landing.

best regards,

johan



Altitude is Insurance - Get Insured
Top Of Page
Forum Index

Reply To This Topic Overweight Taxi Condition
Username:
No username? Sign up now!
Password: 


Forgot Password? Be reminded.
Remember me on this computer (uses cookies)
  • Tech/Ops related posts only!
  • Not Tech/Ops related? Use the other forums
  • No adverts of any kind. This includes web pages.
  • No hostile language or criticizing of others.
  • Do not post copyright protected material.
  • Use relevant and describing topics.
  • Check if your post already been discussed.
  • Check your spelling!
  • DETAILED RULES
Add Images Add SmiliesPosting Help

Please check your spelling (press "Check Spelling" above)


Similar topics:More similar topics...
Sea-Tac One-way Taxi posted Fri Jul 6 2007 22:36:23 by Nwray
Weird Sounds During Taxi On Airbus Widebodies? posted Thu Jun 21 2007 01:29:58 by SW733
Ice Crystals Falling From Air Condition Vents posted Thu Jun 7 2007 20:50:30 by CO777DAL
How Do Planes Taxi Exactly? posted Sat Apr 21 2007 08:22:25 by CaptainJon
New Pilot Has Silly Questions About Taxi/takeoff posted Tue Mar 20 2007 23:12:37 by JETBLUEATASW
Slow Taxi On Ice posted Thu Feb 22 2007 05:27:34 by CoolGuy
1 Engine Taxi / Fuel Burn posted Fri Dec 29 2006 01:59:09 by HPLASOps
What To Do In A Foggy Condition? posted Sat Dec 23 2006 10:26:32 by UAEflyer
Thrust For Taxi posted Wed Jun 21 2006 18:07:09 by Codeshare
L-1011 Starting Engines During Taxi posted Fri May 26 2006 01:03:28 by 747400sp

Sponsor Message:
Printer friendly format