JetBlue A320 landing at LAX
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I gather from another forum that there was a blown hydraulic seal.
Adding my own 2 bob's worth, the steering is actuated through two horizontally opposed pistons on the strut. When the O-ring blows out on one piston then the other would push the nosewheel hard over.
Not hard to imagine an O-ring failure
Adding my own 2 bob's worth, the steering is actuated through two horizontally opposed pistons on the strut. When the O-ring blows out on one piston then the other would push the nosewheel hard over.
Not hard to imagine an O-ring failure
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At least the seventh such incident, according to this report:
http://http://www2.dailynews.com/ant...ley/ci_3053966
http://http://www2.dailynews.com/ant...ley/ci_3053966
Sims Fly Virtually
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might a stop-cock in the nosewheel hydraulic system, and a castoring spring attached to the wheel be an answer?
if they go for it, I want royalties - You Saw it Here First!
if they go for it, I want royalties - You Saw it Here First!
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>might a stop-cock in the nosewheel hydraulic system, and a castoring spring attached to the wheel be an answer?
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Together with a trap-door and a rope-ladder, so that the Flight Engineer (who-he nowadays?) could shin down and close the stop-cock whilst the pilot 'held it steady'?
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Together with a trap-door and a rope-ladder, so that the Flight Engineer (who-he nowadays?) could shin down and close the stop-cock whilst the pilot 'held it steady'?
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More info @
http://www.pprune.org/forums/showthr...0&pagenumber=1
"It's the second occurrence in JetBlue & would you believe it - the same skipper was in command! Old hat to the guy but he must have been chanting "why me again?"
http://www.nydailynews.com/front/sto...p-297803c.html
http://www.pprune.org/forums/showthr...0&pagenumber=1
"It's the second occurrence in JetBlue & would you believe it - the same skipper was in command! Old hat to the guy but he must have been chanting "why me again?"
http://www.nydailynews.com/front/sto...p-297803c.html
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Incident Reports
Information about incidents like the two with jetBlue, and similiar, can be located on the US DOT website (Not NTSB).
This link will take you to the Document Managment Server
http://dms.dot.gov/search/searchFormAdvanced.cfm
This link will take you to the Document Managment Server
http://dms.dot.gov/search/searchFormAdvanced.cfm
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low-cost-airline = low-cost-maintenance
I feel commiserate with the lonesome, unfortunate Skipper, who has to deal twice with sluttish ("low-cost") maintenance.
Do you have any data to back up your claim of "low-cost" (or, you seem to imply, "inferior") maintenance practices at JetBlue? What knowledge do you have of the LCCs in general in the U.S.?
I am very comfortable with the maintenance practices and personnel at JetBlue.
And, I can assure you that the major LCCs in the U.S.A. (Southwest, JetBlue, America West, AirTran, etc) have had no serious questions raised about maintenance.
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>It can't be a design flaw. Airbus has NEVER made a design flaw. Just ask them
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I notice that several design changes were made.
During my career as an Experimental Vehicle Test Engineer, we frequently had 'failures' which were deemed to be irrelevant because the designer had meanwhile revised the design (albeit not significant to the failure). You had to ensure that the latest design release level parts were fitted, otherwise . . .
. . . the failure didn't 'count'!
Even the latest report
http://www.ntsb.gov/ntsb/brief2.asp?...03IA027&akey=1
(which 'suggests' that the failures were as a result of incorrect assembly) is, in my opinion, a design fault - a safety-critical item should NOT be capable of incorrect assembly. If necessary, an assembly-jig should be employed.
Remember Murphy!
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I notice that several design changes were made.
During my career as an Experimental Vehicle Test Engineer, we frequently had 'failures' which were deemed to be irrelevant because the designer had meanwhile revised the design (albeit not significant to the failure). You had to ensure that the latest design release level parts were fitted, otherwise . . .
. . . the failure didn't 'count'!
Even the latest report
http://www.ntsb.gov/ntsb/brief2.asp?...03IA027&akey=1
(which 'suggests' that the failures were as a result of incorrect assembly) is, in my opinion, a design fault - a safety-critical item should NOT be capable of incorrect assembly. If necessary, an assembly-jig should be employed.
Remember Murphy!
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Official documents
Some more:
Source: http://64.233.183.104/search?q=cache...32-1197+&hl=en
"One operator experienced three events when the aircraft landed with the nose wheel turned to 90 degrees. Investigation revealed that the two O-ring seals fitted to the electro hydraulic distributor which controls the hydraulic supply to the steering control module 6GC were extruded due to ageing or the absence of a back up ring. This defect allowed permanent pressurisation of the steering actuator through the steering selector valve and the possibility of the nose wheel rotating through 90 degrees. This directive introduces new seals into hydraulic control module 6GC to prevent an occurrence of such a defect. "
More in
HERE
Source: http://64.233.183.104/search?q=cache...32-1197+&hl=en
"One operator experienced three events when the aircraft landed with the nose wheel turned to 90 degrees. Investigation revealed that the two O-ring seals fitted to the electro hydraulic distributor which controls the hydraulic supply to the steering control module 6GC were extruded due to ageing or the absence of a back up ring. This defect allowed permanent pressurisation of the steering actuator through the steering selector valve and the possibility of the nose wheel rotating through 90 degrees. This directive introduces new seals into hydraulic control module 6GC to prevent an occurrence of such a defect. "
More in
HERE
Paxing All Over The World
Airbus_a321 As a passenger, I care not whether it is high/low cost or Airbus/Boeing/DHC/Embraer/etc. I care that I get there.
The prevailing common factor of this failure, is that this is happening to Airbus 320s and that needs to be fixed.
In the long thread following the incident last week, folks suggested that, if the gear does fail, it may be better that it rotate to 90 degrees, rather than be left at 10 or 15. From the two lots of Jet Blue photos, we see that the nose gear strut has withstood the remarkable forces upon it and not collapsed, that has to be in favour of manufacturer.
As there appears to have been no loss of life due to these failures (all of them) then we can see that the flight crew have done very well with the situation presented. On that, whilst it may be unfortunate for the same JB Captain to have the same fault twice, if I was a pax on the flight, I would have been rather pleased that he had direct experience of the problem!
The "low-cost-airline = low-cost-maintenance" line that you are attempting to push, has been dicussed in PPRuNe countless times and no one has presented evidence that this is true. All LCC carriers know that the first hull loss could put them out of business. When I look at stats for hull losses across the globe and back over decades, thus far the LCCs are doing OK. However, it will be another 20 years before the accusation that you posit can be assessed.
As you appear to believe that LCCs are scrimping on maintenance, I suggest that you report the evidence you have to the relevant authorities as quickly as possible. After all, you would not want to see LCC machines crash and know that you could have saved them ... would you?
The prevailing common factor of this failure, is that this is happening to Airbus 320s and that needs to be fixed.
In the long thread following the incident last week, folks suggested that, if the gear does fail, it may be better that it rotate to 90 degrees, rather than be left at 10 or 15. From the two lots of Jet Blue photos, we see that the nose gear strut has withstood the remarkable forces upon it and not collapsed, that has to be in favour of manufacturer.
As there appears to have been no loss of life due to these failures (all of them) then we can see that the flight crew have done very well with the situation presented. On that, whilst it may be unfortunate for the same JB Captain to have the same fault twice, if I was a pax on the flight, I would have been rather pleased that he had direct experience of the problem!
The "low-cost-airline = low-cost-maintenance" line that you are attempting to push, has been dicussed in PPRuNe countless times and no one has presented evidence that this is true. All LCC carriers know that the first hull loss could put them out of business. When I look at stats for hull losses across the globe and back over decades, thus far the LCCs are doing OK. However, it will be another 20 years before the accusation that you posit can be assessed.
As you appear to believe that LCCs are scrimping on maintenance, I suggest that you report the evidence you have to the relevant authorities as quickly as possible. After all, you would not want to see LCC machines crash and know that you could have saved them ... would you?
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Airbus_a321:
You may want to think carefully before you speak (or type). It's a pretty safe guess as to who you work for, and their mtce has had its issues in the past, just as every airline has. Airplanes are maintained by humans, who just like pilots, truck drivers and everybody else, they occasionally make mistakes.
JetBlue has an excellent safety record, and as has been pointed out above, this is an apparent design flaw as opposed to a maintenance problem. And, it has happened to major carriers as well as charters and low cost airlines.
You may want to think carefully before you speak (or type). It's a pretty safe guess as to who you work for, and their mtce has had its issues in the past, just as every airline has. Airplanes are maintained by humans, who just like pilots, truck drivers and everybody else, they occasionally make mistakes.
JetBlue has an excellent safety record, and as has been pointed out above, this is an apparent design flaw as opposed to a maintenance problem. And, it has happened to major carriers as well as charters and low cost airlines.
