View Full Version : Airbus designed limitation tolerance
Mbizous
30th Jul 2017, 06:47
Hi, guys
I have a question on aircraft limitation torlerance and i'd appreciate any replies just to broaden my knowledge. Airbus has limitations on all systems as well as operational limitation of the aircraft, do they have any toleratable margin for those and exactly how many percents do they apply on that?
Example: for A321 maximum landing weight of 75.500 kg, what would be the toleratable margin applied for that weight?
If you have any reference please give me. Thanks guys!
Piltdown Man
30th Jul 2017, 21:38
There will always be a margin and that will be specified in the design and certification standards. I believe aircraft have to be take a landing at 6 fps at maximum design weight. But Airbus will consider that any landing in excess of the weight you have purchased as an overweight landing. That will certainly entail paperwork and possibly inspections, depending on the actual exceedence.
So yes there is a margin, but not as far as the manufacturer is concerned.
megan
31st Jul 2017, 06:43
You'll find design standards for transport category aircraft here. Landing loads begin at §25.471.
https://www.ecfr.gov/cgi-bin/text-idx?SID=7148669c55a6126f78496be343ad9e5f&mc=true&tpl=/ecfrbrowse/Title14/14cfr25_main_02.tpl
Mbizous
1st Aug 2017, 01:34
@piltdown Man: thanks for your reply, i really understand what you mean but in my case i had a landing weight of 75.600kg ( max landing weight 75.500kg ), i landed smoothly with 125f/min at touchdown and load factor report was 1.4G, i know i already violated the aircraft landing weight limitation with 100kg excedence, so again my question is : that 100kg could be considered acceptable refering to airbus safety margin or violation is violation and there's no tolerance in case of exceeding the published limitation?
@ Megan: thanks but i can't find any content in your link ( report of dead link ).
Fursty Ferret
1st Aug 2017, 17:48
Not an engineer. My thoughts: don't worry about it.
Airbus sell the things on the principle that they can tolerate a 2.5G touchdown at max landing weight every landing, every day, for their entire lives.
compressor stall
2nd Aug 2017, 01:13
The greater issue is how it happened to begin with.
The use of standard weights and carrying a weightlifting team would see aircraft regularly land a couple of hundred kilos overweight.
The issue here is not structural, rather operational compliance.
applecrumble
2nd Aug 2017, 07:28
Not an engineer. My thoughts: don't worry about it.
Airbus sell the things on the principle that they can tolerate a 2.5G touchdown at max landing weight every landing, every day, for their entire lives.
Where did you get that number 2.5 from?
The aircraft for landing is designed around hitting the ground at 600fpm and 6fps.
As long as you made an entry in the Aircraft Maintenance Log for the engineers.
100 kg is nothing, they will have a procedure to follow for it in their AMM.
Anytime you exceed ANY limitation on the Aircraft write it up.
Oh and submit an Air safety report too.
Mbizous
2nd Aug 2017, 09:23
The greater issue is how it happened to begin with.
The use of standard weights and carrying a weightlifting team would see aircraft regularly land a couple of hundred kilos overweight.
The issue here is not structural, rather operational compliance.
Totally agree ,mate!
@Gentlemen: many thanks for your replies.