Swedish Air Force Maintenance Programme for Aged Transparent Enclosures for Jet Trainer and Jet Fighter Aircraft,
DEFENCE MATERIAL ADMINISTRATION STOCKHOLM (SWEDEN) FLIGHT SAFETY UNIT
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An investigation involving FMV, SAAB-SCANIA and FFV Maintenance triggered a chain of activities concerning questions about the structural reliability of acrylic enclosures 10-15 years old or more, and questions about different types of edge attachment defects, and methods for the detection of hidden edge defects. The Acrylics Defect Prism Inspection Method was re-invented and further developed, making is possible to detect defects such as cracks, delaminations and bond separations within the otherwise concealed regions of the edge attachments of windshields and canopies. The prism inspection of the inner sides of the transparency edges is done from the outside of the enclosure. Today the aged windshields and canopies of the SAAB-SCANIA 35 Draken and the canopies of the SAAB-SCANIA 105 trainer are periodically inspected and the defects are traced. The SAAB-SCANIA 37 Viggen enclosures are due for a similar inspection programme.