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- 05/02/2012, 19:32 #1
Boeing revisará la flota del 787 por indicios de delaminación
Parece que encuentraron problemas de delaminación de la fibra de carbono en 3 fuselajes
Delamination prompts Boeing to inspect 787 fleet
Boeing again faces a manufacturing quality issue, requiring inspections and repairs of its 787 fleet.
Structural stiffeners were found to be improperly joined to the composite skin in the aft sections of the aircraft, causing parts of the aircraft's carbon fibre structure to delaminate, confirms the airframer.
"Boeing has found that incorrect shimming was performed on support structure on the aft fuselage on certain airplanes in our facility in Everett, [Washington]," said the airframer.
Flightglobal has confirmed there are at least three affected airframes, Airplanes 56, for All Nippon Airways, where the problem was first discovered, and Airplanes 57 and 58, the first two aircraft for Qatar Airways.
Boeing declined to say how many 787s have this issue, though sources indicated that there are "significantly more" than the three initially identified in the factory.
Programme sources say the stiffeners, or longerons that run along the length of the aircraft, are delaminating around the rear opening of the Section 48 section above and below the cutout known as the "bird's mouth" that holds the Alenia Aeronautica-built horizontal stabiliser.
Boeing said the issue is a "straightforward repair" and poses no "short-term safety concern" and the airframer said its inspections have revealed "delamination in some instances."
Boeing is currently conducting inspections on the already built 787s and those waiting to be assembled, at least 50 airframes, in Everett and its North Charleston, South Carolina facilities.
"We have this condition well-defined and we are making progress on the repair plan," said Boeing and declined to say if the inspections were slowing preparations for delivering additional 787s.
The issue, identified around 24 January was traced to assembly of the aft fuselage by Boeing South Carolina, Formerly Vought Aircraft Industries, where Sections 47 and 48 are fabricated, assembled and stuffed with systems before being delivered to final assembly lines in North Charleston or Everett.
When the longerons are installed on the wound carbon fibre barrel, frames and longerons are secured to the skin of the structure to give it strength. When natural variations in the fit of parts exists, aerospace mechanics will install shims, or spacers, which compensate for variations and wedge into structure to create a tighter fit.
Without the shims, damage can be sustained to the composite when fasteners are installed by pulling the structure together, damaging the layers of carbon fibre.
Over the long-term composite delamination can decrease the fatigue life of the aircraft's structure.
Boeing said it has "already taken appropriate steps to address this issue" in South Carolina, declining to elaborate on what steps it has taken.
"We have already notified our early customers to ensure they are informed and aware of our plans to make repairs, should they be needed," the company said.
ANA, currently the sole operator of five 787s, said: "Currently we are not experiencing the issue; however, we are aware of this issue arising at the factory, and will take appropriate action when contacted by Boeing."
For the affected aircraft, Boeing said its "current plan", which one programme source described as "tedious", will not require the removal of the 787's tail cone and horizontal stabiliser to fix the longerons, its initial remedy for aircraft in the factory, and it can "address this condition without removal of any major structural parts."
"Repairs, should they be needed, will be implemented in the most efficient manner possible," said Boeing in order to maintain a design that conforms with its airworthiness certification standards.
Boeing has faced manufacturing quality issues before, most notably the June 2010 inspection, teardown and reinstallation of many Alenia Aeronautica-built horizontal stabilisers after many were assembled without proper shimming creating gaps in the structure that threatened the fatigue life of the empennage.
Delamination prompts Boeing to inspect 787 fleet
- 05/02/2012, 19:37 #2
Última edición por B738; 05/02/2012 a las 19:42
- 05/02/2012, 20:24 #3
- 05/02/2012, 20:36 #4
Para un inculto en estos temas... ¿Esto como es de jodido?
- 05/02/2012, 20:37 #5
Si alguien cree que un avión nuevo, con tecnología nueva y procesos de fabricación nuevos, no va a tener problemas es que su reino no es de este mundo. Aparecen los problemas, se diseña la reparación, se revisan los procedimientos de fabricación y se deja que la tierra continúe girando. Lo mismo que con el otro, el que no se puede nombrar en los hilos "de Boeing"."Though I Fly Through the Valley of Death, I Shall Fear No Evil. For I am at 80,000 Feet and Climbing."
- 05/02/2012, 21:09 #6
Vaya, parece que a alguien se le atraganta el plástico...
- 06/02/2012, 00:20 #7
Yo flipo cn algunas respuestas que se ven aqui, y sobre todo porque deben de ser expertos en mareriales compuestos...
- 06/02/2012, 00:36 #8
Esto no es nada, un pelin de silicona y arreglado.
Enviado desde mi GT-I9000 usando Tapatalk
Living la vida Pro
- 06/02/2012, 13:56 #9
- 06/02/2012, 14:57 #10
Pues yo en este topic no he visto a nadie sacando los pies del tiesto :/"God created AIRCRAFT MECHANICS so pilots can have heroes too"
“A wise man makes his own decisions; an ignorant man follows public opinion”
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