Omni 767 gear collapse in Bucharest
Thread Starter
Join Date: Mar 2006
Location: USA
Posts: 2,404
Likes: 0
Received 0 Likes
on
0 Posts
Omni 767 gear collapse in Bucharest
But thanks
24 years old isn't particularly high for a 767. I didn't find anything on hours/cycles when I Googled (and I've not had access to the Boeing data base since I retired), but there are a fair number of 767s still in service with north of 100,000 hrs, still going strong without the gear collapsing.
As Hon Jim alludes to, a gear collapse is most likely faulty maintenance.
As Hon Jim alludes to, a gear collapse is most likely faulty maintenance.
Join Date: Mar 2007
Location: USofA
Posts: 1,235
Likes: 0
Received 0 Likes
on
0 Posts
As I recall when referencing the Boeing Low Utilization Plan a gear overhaul something like 10,000 landings, or 10 years which ever came first.
Last edited by Spooky 2; 29th Aug 2020 at 21:22. Reason: spelling
As Hon Jim alludes to, a gear collapse is most likely faulty maintenance
I don't think it exists. In all likelihood, the comment on the ATSB site is still valid:
It's by no means the only accident from many years ago that is still technically "under investigation" by the ANSV.
"The investigation by the Italian authorities is continuing. The ATSB has completed its contribution to the Italian investigation and plans to publish a copy of the final report on the ATSB website Australian Transport Safety Bureau (ATSB) when it is received from the Italian authorities."
Was an order for Continental Airlines but never delivered, taken up by Ansett Australia until their collapse, had a very spacious 2-2-1 Business Class, 25 seats and I think 185 Economy for a capacity of 210...
Join Date: Oct 2013
Location: McHales Island
Age: 68
Posts: 176
Likes: 0
Received 0 Likes
on
0 Posts
Looking at the 1st photo in the 1st post. It looks as though the oleo has snapped clean in half, suggesting a possible flaw in the manufacture of the oleo and has taken this long to rear its ugly head. Nothing to do with an aircraft fault I believe. Open to correction though.
I don't think it exists
It looks as though the oleo has snapped clean in half, suggesting a possible flaw in the manufacture of the oleo and has taken this long to rear its ugly head. Nothing to do with an aircraft fault I believe. Open to correction though.
But whether that suggests a poor weld, or simply fatigue at a vulnerable spot, or both, or whatever, I leave to engineers with more knowledge, or the investigators.
Thought police antagonist
As always with incidents, there's a multitude of potential causal factors which only the subsequent investigation will be able to determine resulted in the gear collapse.
That said, leaving aside, for now, possible maintenance / manufacturing error it would come as no surprise if more than one form of corrosion was discovered as has been the case many times in the past with similar u/c failures. This might help offer an insight therefore .....
https://www.aircraftsystemstech.com/...corrosion.html
That said, leaving aside, for now, possible maintenance / manufacturing error it would come as no surprise if more than one form of corrosion was discovered as has been the case many times in the past with similar u/c failures. This might help offer an insight therefore .....
https://www.aircraftsystemstech.com/...corrosion.html
Join Date: Aug 2000
Location: EGGW
Posts: 2,108
Likes: 0
Received 0 Likes
on
0 Posts
The most likely cause is not from a manufacturing defect but from a previous restoration/overhaul of the gear.
Part of the blame must rest with the FAA & EASA authorities and others because originally there was no set procedure for a restoration (MRBR/MPD) requirement of the landing gear.
Each landing gear overhaul agency would perform there own procedure as there was never a set procedure to follow.
It was only around 5 or so years ago that authorities brought in set CMM or SB procedures which would be required to be meet, this to allow a FAA 8130 or EASA Form 1 to be issued for a restoration of the LDG to meet the MRB requirements.
This was not just for the Boeing 767 but other Boeing, Airbus and other manufactures aircraft.
Part of the blame must rest with the FAA & EASA authorities and others because originally there was no set procedure for a restoration (MRBR/MPD) requirement of the landing gear.
Each landing gear overhaul agency would perform there own procedure as there was never a set procedure to follow.
It was only around 5 or so years ago that authorities brought in set CMM or SB procedures which would be required to be meet, this to allow a FAA 8130 or EASA Form 1 to be issued for a restoration of the LDG to meet the MRB requirements.
This was not just for the Boeing 767 but other Boeing, Airbus and other manufactures aircraft.
Join Date: Apr 2004
Location: Dorset UK
Age: 70
Posts: 1,753
Likes: 0
Received 0 Likes
on
0 Posts
If the manufacturer of the landing gear didn't issue a CMM then how could anyone certify an overhaul/repair/restoration of the leg?
You need a statement along the lines of "I/we hereby certify that the Overhaul/Repair has been carried out in accordance with CMM 32-xx-xx rev xx" to issue an FAA 8130 or EASA form1.
You need a statement along the lines of "I/we hereby certify that the Overhaul/Repair has been carried out in accordance with CMM 32-xx-xx rev xx" to issue an FAA 8130 or EASA form1.
Join Date: Aug 2000
Location: EGGW
Posts: 2,108
Likes: 0
Received 0 Likes
on
0 Posts
dixi188
Yes you are correct, but my understanding is that the CMM has all the various procedures just like an aircraft AMM has, but the issue was what of the hundreds of items within it that you need to perform to meet the requirement of a restoration.
The other issue is that the restoration as per the MRBR/MPD is for both LDG and components.
So what components have to be included within the requirement, it was a mess and the other issue was what parts would be scrapped as part of the restoration.
Anyone who has knowledge of how the MRBR is developed knows that airlines continuously supply details of findings from inspections, this enables increase in inspection intervals and the odd time a reduction is needed.
Corrosion findings will some times stop a structural inspection interval being increased, but this is where LDG becomes an issue.
Most airlines tend to swap out LDGs when they go for overhaul, they can't wait for the months it takes to send away for restoration and be returned.
So they fit a replacement from another source.
The issue is that very few airlines bother to get a full shop visit report, this from the LDG that they have swapped out for a serviceable one.
This LDG may have had a number of sections/parts that would have had corrosion and at what level.
This would be removed and repaired, or it could just be replaced, this is because it would be cheaper to replace and not repair.
This means the likes of Boeing and Airbus don't get the information that they need.
As you can see LDGs have always been a problem and that is why in my opinion you are going to continue to see this type of accident on aircraft in the future.
Yes you are correct, but my understanding is that the CMM has all the various procedures just like an aircraft AMM has, but the issue was what of the hundreds of items within it that you need to perform to meet the requirement of a restoration.
The other issue is that the restoration as per the MRBR/MPD is for both LDG and components.
So what components have to be included within the requirement, it was a mess and the other issue was what parts would be scrapped as part of the restoration.
Anyone who has knowledge of how the MRBR is developed knows that airlines continuously supply details of findings from inspections, this enables increase in inspection intervals and the odd time a reduction is needed.
Corrosion findings will some times stop a structural inspection interval being increased, but this is where LDG becomes an issue.
Most airlines tend to swap out LDGs when they go for overhaul, they can't wait for the months it takes to send away for restoration and be returned.
So they fit a replacement from another source.
The issue is that very few airlines bother to get a full shop visit report, this from the LDG that they have swapped out for a serviceable one.
This LDG may have had a number of sections/parts that would have had corrosion and at what level.
This would be removed and repaired, or it could just be replaced, this is because it would be cheaper to replace and not repair.
This means the likes of Boeing and Airbus don't get the information that they need.
As you can see LDGs have always been a problem and that is why in my opinion you are going to continue to see this type of accident on aircraft in the future.
