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Significance and Use
This practice is useful as a screening basis for acceptance or rejection of transparencies during manufacturing so that units with identifiable flaws will not be carried to final inspection for rejection at that time.
This practice may also be employed as a go-no go technique for acceptance or rejection of the finished product.
This practice is simple, inexpensive, and effective. Flaws identified by this practice, as with other optical methods, are limited to those that produce temperature gradients when electrically powered. Any other type of flaw, such as minor scratches parallel to the direction of electrical flow, are not detectable.
1.1 This practice covers a standard procedure for detecting flaws in the conductive coating (heater element) by the observation of polarized light patterns.
1.2 This practice applies to coatings on surfaces of monolithic transparencies as well as to coatings imbedded in laminated structures.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific precautionary statements see Section 6.
ICS Number Code 49.060 (Aerospace electric equipment and systems)
UNSPSC Code 25200000(Aerospace systems and components and equipment)
ASTM F319-09, Standard Practice for Polarized Light Detection of Flaws in Aerospace Transparency Heating Elements, ASTM International, West Conshohocken, PA, 2009, www.astm.orgBack to Top