DEGRADATION LIMITS OF PLASTIC WINDSHIELDS IN SERVICE.
FEDERAL AVIATION ADMINISTRATION WASHINGTON D C AIRCRAFT DEVELOPMENT SERVICE
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A study of the optical and strength characteristics of plastic aircraft windshields was conducted to determine practical inspection tests that can be applied to in-service windshields. Portable instruments were developed to measure luminous transmittance and light scattering, and subjective visual tests were conducted to determine the effect of optical degradation on vision. Structural deterioration caused by crazing was also investigated. Project results indicate that further testing of the developmental instruments is desirable, and that additional subjective tests are needed to establish a rejection scale based upon visual performance through degraded windshields. Author