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MD-11 Range, Help Needed

Sat Apr 06, 2002 3:44 pm

What is the true range of the MD-11 standard, and ER? I've been hearing many different figures. Someone told me you would be lucky to get 6,500 NM out the ER, but then I hear the ER can make 8,000 NM. So what is the range, the true range the MD-11. Pilots and Mechs especially your response will be truly appreciated.

I also know that this has been discused before but like I said I get many different numbers.

Ejay MD-11
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RE: MD-11 Range, Help Needed

Sat Apr 06, 2002 7:20 pm

Well the numbers can stop!
Look up this site:
Select product information, Technical specifications and Range.
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RE: MD-11 Range, Help Needed

Sun Apr 07, 2002 1:45 am

Pacifism only works if EVERYBODY practices it
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RE: MD-11 Range, Help Needed

Sun Apr 07, 2002 11:47 am

Thanks, but I have all this information, but like I said the numbers keep changing. A pilot told me that the range on the sites above look good on paper but is not the real, or accurate ranges of the MD-11. If the information is correct, what is the the problem with the range. Isn't it pretty close to its competitors?

Ejay MD-11
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RE: MD-11 Range, Help Needed

Mon Apr 08, 2002 1:13 am

The range given on the Boeing site is the MAX possible range I believe.In practise it is less.
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RE: MD-11 Range, Help Needed

Mon Apr 08, 2002 2:41 am

When MDD introduced the MD-11 it did not meet the original range specification. Therefore MDD had to pay some compensation for airlines like Swissair, American Airlines, Delta.
With the years they offered some PIP's (Perfomance Improvement Package) which brought the range close to the original specification range. This came quite too late for some operators. For example Singapore Airlines cancelled their MD-11 orders in favour for the A-340.

As I fly frequently with the MD-11 to Asia I also had the chance to talk to some Swiss pilots. They told me, that the performance of each aircraft in the fleet is different, "each is individual". They only chose some aircraft for ultra-long haul routes whith almost critical range.
I can ask for more details on my trip in April!!!

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RE: MD-11 Range, Help Needed

Wed Apr 10, 2002 12:15 pm

How come some airline (Swissair)had PIP like drooping alierons while others(Delta) did not? Was there any disadvantages with having the PIP installed?
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RE: MD-11 Range, Help Needed

Wed Apr 10, 2002 9:03 pm

The range quoted by manufacturers is normally the maximum range. This is difficult to achieve in practice as it assumes maximum fuel, which is not possible with a reasonable passenger / freight payload.

As VASI correctly suggests, each aircraft has slightly different fuel burn, and a percentage is applied to the standard fuel calculation to take this into account. Also some aircraft have a lower Basic Empty Mass (BEM) which will allow more fuel for a given passenger load (since all aircraft have the same MTOM) which in turn means more range.

Departure airport runway length / runway in use / weather conditions also has an impact, as a "Performance Limited Takeoff Mass" may be applied which is less than MTOM, meaning less fuel can be loaded for a given PAX load.

So in reality there is a different "potential range" for every single flight on every single aircraft.
I used to love the smell of Jet-A in the morning...
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RE: MD-11 Range, Help Needed

Mon Apr 15, 2002 1:17 am

Actually MD11 is very much like Airbus when you talk about dropping ailerons and elevators. This happens when the plane loses hydraulic power. So the elevators and ailerons just droop down.

This is certainly nothing to do with PIP. If you see carefully, all MD11 will have this dropping feature including Delta which will also happen.

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RE: MD-11 Range, Help Needed

Tue Apr 16, 2002 11:40 am

Ironically, a key sales loss for the MD-11 was SIA who ordered and then cancelled the MD-11 when MDD stated that it would fall short of range/payload requirements on the key SIN-CDG route. SIA ordered the A340 whose performance also fell short of expectations on this route, after delivery.

I dumped at the gybe mark in strong winds when I looked up at a Porter Q400 on finals. Can't stop spotting.
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RE: MD-11 Range, Help Needed

Sat Apr 20, 2002 8:45 pm

MNL to LHR nonstop on an ER. 16:45 as I recall
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RE: MD-11 Range, Help Needed

Sun Apr 21, 2002 5:41 am

Swiss says for their MD 11 13000 km (ap 8000 mi) with full pax, no cargo.

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