APRIL 2013 GROUND HANDLING INTERNATIONAL
COMPOSITE AIRCRAFT HANDLING 37
Excerpt from European Aviation Safety Agency’s AMC 20-29 document
Damage Tolerance Evaluation Currently, there are very few industry standards that outline the critical damage threats for particular composite structural applications with enough detail to establish the necessary design criteria or test and analysis protocol for complete damage tolerance evaluation. In the absence of standards, it is the responsibility of individual applicants to perform the necessary development tasks to establish such data in support of product substantiation. Some factors to consider in development of a damage threat assessment for a particular composite structure include part function, location on the aircraft, past service data, accidental damage threats, environmental exposure, impact damage resistance, durability of assembled structural details (eg, long-term durability of bolted and bonded joints), adjacent system interface (eg potential overheating or other threats associated with system failure) and anomalous service or maintenance handling events that can overload or damage the part. As related to the damage threat assessment and maintenance procedures for a given structure, the damage tolerance capability and ability to inspect for known damage threats should be developed.
Editor’s note: We have emboldened part of the text
it is not left on the aircraft. In United’s case, Technical Operators and Inspectors would be the staff to use this device, along with United’s SRM in determining and assessing any occasioned damage. As these reports were coming in I
had recourse to some old-fashioned detective work. Quite how mankind has survived all these years without a search engine is beyond me but it didn’t take much effort on the PC to come up with an answer. Olympus makes
something called the 35RDC, which is essentially a hand-held scanning device that incorporates a small screen. This ultrasonic instrument is actually derived from other industry sectors where it has seen extensive use in fi elds such as pipe inspection. Aimed at NDT technicians, its purpose is that of detecting delamination in the wake of unintentional impact.
Its makers say that it is suited for use by non-NDT trained personnel and that the concept was developed and subsequently patented by Boeing: it works on pulse and echo techniques. The device is pre-set to the requirements of the material it will inspect, making it child’s play to use. In fact, the tool is now referenced in the B787 Structural Repair Data. The Olympus spokesperson stopped short of saying whether or not the tool was endorsed or in any way recommended by Boeing, though, which raises yet another question over its usage. From the foregoing it seems that Olympus is not the only manufacturer currently offering a tool specifi cally for use with the B787: and that raises the question of standardisation of product,
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15/03/2013 12:28
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