Double pass retroreflection for corrosion detection in aircraft structures

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TypeArticle
Proceedings titleAGARD Conference Proceedings
Conference79th Meeting of the AGARD Structures and Materials Panel on Corrosion Detection and Management of Advanced Airframe Materials, Oct. 5-6, 1994, Seville, Spain
ISSN0549-7191
ISBN92-836-101 1-3
VolumeCP-565
Pages7-17-12
SubjectAircraft Structures, Corrosion, Damage, Inspection, Nondestructive Tests, Retroreflection, Surface Distortion, Computerized Simulation, Fuselages, Mathematical Models, Transport Aircraft
AbstractAn optical double pass retroreflection surface inspection technique (D Sight) used for visualizing surface distortions, depressions or pertrusions has been adapted as a rapid, enhanced visual inspection method inspection of large external aircraft surfaces. A project to fully characterize the D Sight indications of corrosion damage in lap splices is currently active. Over 150 large transport aircraft fuselage lap splice specimens have been collected. D Sight Aircraft Inspection System - (DAIS) 250C has been developed and tested both in the laboratory and in the field. In laboratory tests lap splices retrieved from retired aircraft and subjected to accelerated corrosion and lap splices naturally corroded in-service were inspected with DAIS, eddy current, X-ray, shadow moire and subjected to tear down. It has been shown that the DAIS 250C is capable of locating corrosion pillowing indicative of a thickness loss as low as 2 percent. The first field trial of the DAIS 250C was based on two service bulletins requiring inspection of longitudinal and circumferential lap splices on the 737-200 aircraft from BS 259.5 to BS 1016. The DAIS 250C inspection, including analysis and report, took 36 man-hours. The recommended technique in the SB was close visual inspection and the time required according to the service bulletins, was 278 man-hours.
Publication date
Linkhttps://www.cso.nato.int/Pubs/rdp.asp?RDP=AGARD-CP-565
AffiliationNational Research Council Canada; NRC Institute for Aerospace Research
Peer reviewedNo
NRC numberSMPL-1994-0072
NPARC number8926830
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Record identifierdd08df82-ab65-4eff-b00e-21af892b72b2
Record created2009-04-23
Record modified2016-05-09
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