Author lawrenceworkgrave (3 days) 1)Totaly imprecise title for the video.
2) I 'm sure that the reporter describing live is wishing "Dear God make this to be a catastrophic & deadly accident and me rich and famous!"
Author AKENOXTRM (3 days) awesome piloting skills , centre line landing all the way !!
Author sgtgrash (8 days) There are ways to fly the flag and this isn't it. Both companies make excellent aircraft which, on very rare occasions, develop faults. It's the nature of the beast... ^^
It's quite purile for anyone to use these failures in an attempt to instigate an argument, even worse to do it in the name of national pride. Shame on you...
Author VFA103JollyRogers (8 days) Boeing's been around longer and therefore more crashes, but thay have more time to learn and build from them. Scarebus on the other hand only has 9 a/c types. Also the A380 is a blunder it's too big for the times
Author JetMechMA (11 days) @aaadream You've gone off the deep end. I posted the facts, but you are obsessed with repeating misinformation. You can do that till you're blue in the face man. Have at it.
Author JetMechMA (11 days) @aaadream: The investigation into this incident revealed the same findings as were found on other 320 Aircraft.
JM: That is NOT true. You are putting out misinformation. I posted the official report that has the correct information in THIS case. What's wrong with you....this isn't a contest.
Author JetMechMA (11 days) @aaadream This was Sept 22 2005 at LAX...not New York.
Author JetMechMA (11 days) @aaadream I don't care how many years you got it don't mean squat if you didn't read the official report. Maintenance isn't to blame in every case...and it was NOT to blame in this case. Like I said, it might not have been to blame in previous cases. The only reason the factory couldn't deny THIS one was because the entire nation watched LIVE on television.
Author JetMechMA (11 days) @aaadream: This teardown revealed the upper centering cam had been rotated 20 - 30 degrees when it was installed in the inner cylinder.
JM: That is NOT true of this incident. Mechanics were NOT faulted in this incident. The centering lugs were BROKEN in this incident, not poorly positioned. You are wrong.
Author JetMechMA (11 days) @aaadream You're trying to blame mechanics, but that's not true in this case. It may not have been true in previous cases. If they had the procedure to re-set the BSCU they could have averted the other incidents as well. This was a rare instance of it being a factory design inadequacy. I won't call it a fault, but it was an inadequate design that they fixed after this incident.
Author JetMechMA (11 days) @aaadream: will not turn 90deg with normal steering
JM: This was not normal stering. The pre-landing self test wore out the centering lugs and fatigue cracked them as the report says.
Author JetMechMA (11 days) The fatigue failure of two anti-rotation lugs due to repeated cyclic pre-landing tests, which allowed the nosewheels to deviate from the 0-degree position on landing gear retraction. A contributing factor was the design of the Brake Steering Control Unit (BSCU) system logic, which prevented the nosewheels from centering. Also contributing was the lack of a procedure to attempt to reset the BSCU system under these conditions. (Me: This is only the preliminary report. You can read the Final.)
Author JetMechMA (11 days) Failure of the nosewheels to center initiated a WHEEL N/W STRG FAULT caution message on the ECAM. There were no approved procedures that allowed the flight crew to attempt to reset the BSCU system, which would have re-enabled the hydraulic system and could have resulted in the system recentering the nose wheels. The National Transportation Safety Board determines the probable cause(s) of this incident as follows:
Author JetMechMA (11 days) The Brake Steering Control Unit (BSCU) detected this off center condition and attempted to re-center the nose wheel; due to the sequencing of the nose and main landing gear and their respective doors, hydraulic pressure was shut off to the NLG steering valve. This lack of hydraulic power resulted in a lack of position feedback. After a 0.5-second monitoring time period, the BSCU deactivated the steering system so that the BSCU could not return the nose wheels to center.
Author JetMechMA (11 days) The failed lugs allowed the NLG to deviate from its 0-degree position in the landing gear bay upon gear retraction on takeoff. This resulted in the L/G SHOCK ABSORBER FAULT error message on the ECAM system. When the pilots extended the incident airplane's landing gear, the nose gear achieved the down and locked position 1.5 seconds before the main gear and/or all of the landing gear doors closed. The nose wheel assembly was not centered at this time.
Author JetMechMA (11 days) After determining that the nose landing gear was cocked 90 degrees, the crew landed at an alternate airport, and the NLG tires and both wheels were worn down into the axle. Post incident examination of the nose gear assembly found that two of the four anti-rotation lugs on the NLG upper support assembly fractured and separated due to induced fatigue from the stearing system's programed pre-landing dynamic steering tests that repeatedly cycles pressure to the stearing cylinders.
Author JetMechMA (11 days) Shortly after the landing gear handle was positioned to the up position in the initial climb, the flight crew noted an error message on the Electric Centralized Aircraft Monitoring (ECAM) system listing a fault (L/G SHOCK ABSORBER FAULT) message for the nose landing gear (NLG) shock absorber. The gear handle was then moved to the down position and the crew received an error message of a fault for the nose wheel steering (WHEEL N/W STRG FAULT).
Author JetMechMA (11 days) @aaadream I have 13 years of experience on the A320. The steering computer used to do a continuous self test after gear extention before touchdown. On average they say it did a test turn of the gear 57 times before touch down. Yes. This wore out the internal components and caused the problem in THIS case. They updated the software TWICE to eventually eliminate the steering test movement in flight. They also updated the internal components to make them more robust to reduce chance of reoccurance.
Author JetMechMA (11 days) @aaadream Examining the nose gear on the spot wouldn't have told you a thing about the situation. Look, this isn't a contest, I read the report from the NTSB. You can too. In this case it was not mechanics fault, it was steering computer software and nose gear hardware that could have been built stronger. They fixed both with an AD. I was factory trained at the Airbus training center in Miami, but factory training doesn't break down to the landing gear strut level. You should know that.
Author JetMechMA (11 days) @aaadream While what you describe has happened before, not in this case. The steering computer software caused this malfunction and both the software and the nose gear hardware were updated on the world wide fleet of A320 family to prevent future occurances.
Author JetMechMA (11 days) @thumper49802 You're with Southwest?...that would explain your answer. You don't know about A320s. The NLG don't turn sideways when they retract. In this case the steering computer software was a faulty programming from the factory. The computer does a steering test and it repeated the steering movement test so many times that it fractured the stop inside the cylinder....which jammed the gear at the extreme of movement as we saw it. All A320 family software and steering hardware was updated.
Author tqure (14 days) @frizstyler
You Fail.
Author MCStudios65 (17 days) WHY DID U SWITCH OFF THE HOT CHICKS!?!?!?!
Author frizstyler (19 days) @arminask yeah but boeing is far better in handling.just needs more safety features. airbus is a vomit-bus.
Author GaragebandandBeyond (23 days) @arminask Except that Boeing has been around since 1916 and Airbus 1970.
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1)Totaly imprecise title for the video.
2) I 'm sure that the reporter describing live is wishing "Dear God make this to be a catastrophic & deadly accident and me rich and famous!"
Author AKENOXTRM (3 days)
awesome piloting skills , centre line landing all the way !!
Author sgtgrash (8 days)
There are ways to fly the flag and this isn't it. Both companies make excellent aircraft which, on very rare occasions, develop faults. It's the nature of the beast... ^^
It's quite purile for anyone to use these failures in an attempt to instigate an argument, even worse to do it in the name of national pride. Shame on you...
Author VFA103JollyRogers (8 days)
Boeing's been around longer and therefore more crashes, but thay have more time to learn and build from them. Scarebus on the other hand only has 9 a/c types. Also the A380 is a blunder it's too big for the times
Author JetMechMA (11 days)
@aaadream You've gone off the deep end. I posted the facts, but you are obsessed with repeating misinformation. You can do that till you're blue in the face man. Have at it.
Author JetMechMA (11 days)
@aaadream: The investigation into this incident revealed the same findings as were found on other 320 Aircraft.
JM: That is NOT true. You are putting out misinformation. I posted the official report that has the correct information in THIS case. What's wrong with you....this isn't a contest.
Author JetMechMA (11 days)
@aaadream This was Sept 22 2005 at LAX...not New York.
Author JetMechMA (11 days)
@aaadream I don't care how many years you got it don't mean squat if you didn't read the official report. Maintenance isn't to blame in every case...and it was NOT to blame in this case. Like I said, it might not have been to blame in previous cases. The only reason the factory couldn't deny THIS one was because the entire nation watched LIVE on television.
Author JetMechMA (11 days)
@aaadream: This teardown revealed the upper centering cam had been rotated 20 - 30 degrees when it was installed in the inner cylinder.
JM: That is NOT true of this incident. Mechanics were NOT faulted in this incident. The centering lugs were BROKEN in this incident, not poorly positioned. You are wrong.
Author JetMechMA (11 days)
@aaadream You're trying to blame mechanics, but that's not true in this case. It may not have been true in previous cases. If they had the procedure to re-set the BSCU they could have averted the other incidents as well. This was a rare instance of it being a factory design inadequacy. I won't call it a fault, but it was an inadequate design that they fixed after this incident.
Author JetMechMA (11 days)
@aaadream: will not turn 90deg with normal steering
JM: This was not normal stering. The pre-landing self test wore out the centering lugs and fatigue cracked them as the report says.
Author JetMechMA (11 days)
The fatigue failure of two anti-rotation lugs due to repeated cyclic pre-landing tests, which allowed the nosewheels to deviate from the 0-degree position on landing gear retraction. A contributing factor was the design of the Brake Steering Control Unit (BSCU) system logic, which prevented the nosewheels from centering. Also contributing was the lack of a procedure to attempt to reset the BSCU system under these conditions. (Me: This is only the preliminary report. You can read the Final.)
Author JetMechMA (11 days)
Failure of the nosewheels to center initiated a WHEEL N/W STRG FAULT caution message on the ECAM. There were no approved procedures that allowed the flight crew to attempt to reset the BSCU system, which would have re-enabled the hydraulic system and could have resulted in the system recentering the nose wheels. The National Transportation Safety Board determines the probable cause(s) of this incident as follows:
Author JetMechMA (11 days)
The Brake Steering Control Unit (BSCU) detected this off center condition and attempted to re-center the nose wheel; due to the sequencing of the nose and main landing gear and their respective doors, hydraulic pressure was shut off to the NLG steering valve. This lack of hydraulic power resulted in a lack of position feedback. After a 0.5-second monitoring time period, the BSCU deactivated the steering system so that the BSCU could not return the nose wheels to center.
Author JetMechMA (11 days)
The failed lugs allowed the NLG to deviate from its 0-degree position in the landing gear bay upon gear retraction on takeoff. This resulted in the L/G SHOCK ABSORBER FAULT error message on the ECAM system. When the pilots extended the incident airplane's landing gear, the nose gear achieved the down and locked position 1.5 seconds before the main gear and/or all of the landing gear doors closed. The nose wheel assembly was not centered at this time.
Author JetMechMA (11 days)
After determining that the nose landing gear was cocked 90 degrees, the crew landed at an alternate airport, and the NLG tires and both wheels were worn down into the axle. Post incident examination of the nose gear assembly found that two of the four anti-rotation lugs on the NLG upper support assembly fractured and separated due to induced fatigue from the stearing system's programed pre-landing dynamic steering tests that repeatedly cycles pressure to the stearing cylinders.
Author JetMechMA (11 days)
Shortly after the landing gear handle was positioned to the up position in the initial climb, the flight crew noted an error message on the Electric Centralized Aircraft Monitoring (ECAM) system listing a fault (L/G SHOCK ABSORBER FAULT) message for the nose landing gear (NLG) shock absorber. The gear handle was then moved to the down position and the crew received an error message of a fault for the nose wheel steering (WHEEL N/W STRG FAULT).
Author JetMechMA (11 days)
@aaadream I have 13 years of experience on the A320. The steering computer used to do a continuous self test after gear extention before touchdown. On average they say it did a test turn of the gear 57 times before touch down. Yes. This wore out the internal components and caused the problem in THIS case. They updated the software TWICE to eventually eliminate the steering test movement in flight. They also updated the internal components to make them more robust to reduce chance of reoccurance.
Author JetMechMA (11 days)
@aaadream Examining the nose gear on the spot wouldn't have told you a thing about the situation. Look, this isn't a contest, I read the report from the NTSB. You can too. In this case it was not mechanics fault, it was steering computer software and nose gear hardware that could have been built stronger. They fixed both with an AD. I was factory trained at the Airbus training center in Miami, but factory training doesn't break down to the landing gear strut level. You should know that.
Author JetMechMA (11 days)
@aaadream While what you describe has happened before, not in this case. The steering computer software caused this malfunction and both the software and the nose gear hardware were updated on the world wide fleet of A320 family to prevent future occurances.
Author JetMechMA (11 days)
@thumper49802 You're with Southwest?...that would explain your answer. You don't know about A320s. The NLG don't turn sideways when they retract. In this case the steering computer software was a faulty programming from the factory. The computer does a steering test and it repeated the steering movement test so many times that it fractured the stop inside the cylinder....which jammed the gear at the extreme of movement as we saw it. All A320 family software and steering hardware was updated.
Author tqure (14 days)
@frizstyler
You Fail.
Author MCStudios65 (17 days)
WHY DID U SWITCH OFF THE HOT CHICKS!?!?!?!
Author frizstyler (19 days)
@arminask yeah but boeing is far better in handling.just needs more safety features. airbus is a vomit-bus.
Author GaragebandandBeyond (23 days)
@arminask Except that Boeing has been around since 1916 and Airbus 1970.