The European Aviation Safety Agency (EASA) mandated the replacement of six aluminum rivets on the Airbus A380 in its latest airworthiness directive (AD 12-014) for the type. The rivets have been used at the junction of Fuselage Stringer 21 left and right and Frame 0.
During an engineering review, the pieces have been found “not in compliance with the certification requirements.” While the structural limit load capability is still ensured, the rivets may not sustain ultimate load stress, according to fatigue analysis.
EASA says this could, if not corrected, “lead to inflight loss of the radome in case of rapid decompression and could adversely affect the structural integrity of the aeroplane.”
The agency is now ordering that the rivets be replaced with six hi-lite titanium fasteners. A380 operators must comply within eight months.
The AD applies to all A380-841, -842 and -861 aircraft except where an Airbus modification has already been made during production.
EASA already has issued two A380 ADs this year demanding checks and, when required, repairs to A380 wing rib feet after some showed Type 2 cracks–cracking originating from the forward and aft edges of the vertical web of the feet–during inspections.
source: http://www.aviationweek.com/aw/generic/story_generic.jsp?channel=aviationdaily&id=news/avd/2012/02/17/04.xml&headline=EASA%20AD%20Demands%20A3
During an engineering review, the pieces have been found “not in compliance with the certification requirements.” While the structural limit load capability is still ensured, the rivets may not sustain ultimate load stress, according to fatigue analysis.
EASA says this could, if not corrected, “lead to inflight loss of the radome in case of rapid decompression and could adversely affect the structural integrity of the aeroplane.”
The agency is now ordering that the rivets be replaced with six hi-lite titanium fasteners. A380 operators must comply within eight months.
The AD applies to all A380-841, -842 and -861 aircraft except where an Airbus modification has already been made during production.
EASA already has issued two A380 ADs this year demanding checks and, when required, repairs to A380 wing rib feet after some showed Type 2 cracks–cracking originating from the forward and aft edges of the vertical web of the feet–during inspections.
source: http://www.aviationweek.com/aw/generic/story_generic.jsp?channel=aviationdaily&id=news/avd/2012/02/17/04.xml&headline=EASA%20AD%20Demands%20A3
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