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par Beochien Lun 12 Fév 2018 - 13:04Une histoire qui se répète ??? Pas tout à fait le même moteur ... mais un mauvais génie des joints, dans le BE de P&W 
Un charcutage du joint qui aurait tourné mal, pour le PW1100G ?
Le F-135, il y a 3 ans, peut être
Chez AIN, en 2015.
https://www.ainonline.com/aviation-news/defense/2015-04-06/pratt-whitney-rolls-out-engine-fix-f-35-fighter-fleet
[ltr]Investigators determined that the F135 fire started as a result of excessive rubbing of a polyimide plate seal between the second- and third-stage integrally bladed rotors in the engine’s compressor section. The rubbing caused excessive heating and led to the failure of the third-stage fan rotor.[/ltr]
[ltr]Once the root cause of the engine fire was identified, Pratt & Whitney developed two fixes. The first, “controlled rub-in” procedure involves flying the F-35 in a series of planned maneuvers so that seal, which is designed to be abraded into a groove, or trench, wears in a controlled manner. The second fix was to create a “pre-trench” in the seal during the manufacturing process and retrofit the part in fighters that have been already delivered.[/ltr]
[ltr]“We basically said, instead of rubbing it in, let’s just cut it out,” Mark Buongiorno, Pratt & Whitney’s F135 program vice president, told AIN. “We basically machined that trench in as part of the manufacturing process as opposed to letting the engine do it itself. That fix has been validated. We demonstrated that there was an insignificant loss in performance because of it and we are in the process of retrofitting the fleet to that pre-trench configuration.”[/ltr]
Un charcutage du joint qui aurait tourné mal, pour le PW1100G ?
Le F-135, il y a 3 ans, peut être
Chez AIN, en 2015.
https://www.ainonline.com/aviation-news/defense/2015-04-06/pratt-whitney-rolls-out-engine-fix-f-35-fighter-fleet
[ltr]Investigators determined that the F135 fire started as a result of excessive rubbing of a polyimide plate seal between the second- and third-stage integrally bladed rotors in the engine’s compressor section. The rubbing caused excessive heating and led to the failure of the third-stage fan rotor.[/ltr]
[ltr]Once the root cause of the engine fire was identified, Pratt & Whitney developed two fixes. The first, “controlled rub-in” procedure involves flying the F-35 in a series of planned maneuvers so that seal, which is designed to be abraded into a groove, or trench, wears in a controlled manner. The second fix was to create a “pre-trench” in the seal during the manufacturing process and retrofit the part in fighters that have been already delivered.[/ltr]
[ltr]“We basically said, instead of rubbing it in, let’s just cut it out,” Mark Buongiorno, Pratt & Whitney’s F135 program vice president, told AIN. “We basically machined that trench in as part of the manufacturing process as opposed to letting the engine do it itself. That fix has been validated. We demonstrated that there was an insignificant loss in performance because of it and we are in the process of retrofitting the fleet to that pre-trench configuration.”[/ltr]
?
