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Closer inspection interval detected cracking on 747 pylon

Soumis
 
Qantas’s decision to halve the time between inspections on the engine pylons of its Boeing 747-400 fleet allowed it to detect fatigue cracking before it became a safety issue. The affected 747, registered VH-OJT, was undergoing maintenance in Hong Kong on 5 October 2016 when an inspection of the number two engine pylon identified cracks that had started to develop in the outboard strut ribs in the torque box of the pylon. (www.flightglobal.com) Plus d'info...

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leonkay
Leon Kay 7
Well done Qantas by setting a good example!
pipolito
paul ipolito 4
Curious as to how any level of "cracking" can be considered acceptable. In the world of welding inspection any crack detected by any inspection method is rejected.
WhiteKnight77
WhiteKnight77 4
ASME allows linear indications up to 1/16" before they become relevant and/or rejectable in most instances. AWS does not allow.
we0209
William Jensen 2
ASME B31.1, "Power Piping" states that cracks - external surface are unacceptable without a length for visual examination. It's also the same for Radiography and Ultrasonic examination.
wylann
wylann 2
Some of the parts on the aircraft are very difficult to get to and only can be inspected with the airplane out of service for several days. These inspections are scheduled regularly (several hundred hours/flights, typically).
Basic fracture mechanics/damage tolerance assumes that there IS a flaw in the aircraft at critical locations, and predicts how fast those flaws will grow during flight cycles. When a crack is found, it is repaired if it is a fracture critical part. For less critical parts, it is sometimes adequate to stop drill the crack and delay the repair until the plane is out of service, so there are situations where it is possible to live with a known crack.
nasdisco
Chris B 4
Hopefully others will take notice and do the same as Quantas.
bentwing60
bentwing60 2
Qantas results will have been shared already with Boeing as well as the FAA and either a service letter, A.D., or both will be the result I suspect.
ejjacob
ejjacob 4
Kudo's to Qantas!

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