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ASTM F2108-06(2011)

Historical Reaffirmation

Standard Practice for Inspection of Transparent Parts by Prism

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1.1 Aerospace transparencies undergo high stresses induced by flight, environmental, or other factors. The transparency attachment points are especially subject to fatigue. These areas of fatigue are often obstructed or hidden from normal inspection. An inspector, following the techniques described in this practice, shall use a prism to view damage located near transparency bolt holes, voids, and delamination that are hidden by edge strips or frames.

1.2 The purpose of this practice is to provide acceptable methods for performing prism inspections of transparent materials with specific emphasis on aircraft windscreens and canopies. Caveats and lessons learned from experience are included to assist authors in writing tailored inspection instructions for specific applications.

1.3 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.

Prisms are useful tools for viewing areas otherwise obstructed or hidden from normal viewing. For example, transparency bolt holes, voids, and delaminations that are covered by edge strips or frames can be seen through a prism. The prism, once put against the transparency, with a coupling agent to wet the surfaces, allows viewing of the area below where the prism is placed.

SDO ASTM: ASTM International
Document Number F2108
Publication Date Dec. 1, 2011
Language en - English
Page Count 7
Revision Level 06(2011)
Supercedes
Committee F07.08
Publish Date Document Id Type View
June 1, 2017 F2108-17 Revision
Nov. 1, 2006 F2108-06 Revision
May 10, 2001 F2108-01 Revision
May 1, 2022 F2108-17R22 Reaffirmation
Dec. 1, 2011 F2108-06R11 Reaffirmation