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A-20A Crew Station Lighting
ARP924B - Specification and Inspection of Glass for Integrally Lighted Aerospace Instruments
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Darin Michael Bernardi
Specification and Inspection of Glass for Integrally Lighted Aerospace Instruments
This SAE Aerospace Recommended Practice (ARP) covers the requirements for the types of glass to be utilized in the fabrication of cover glasses and lighting wedges used in aerospace instruments. It defines the maximum extent of physical defects and recommends standard methods of inspection and evaluation. Definitions of terminology used in this document are covered in 2.2.
ARP924B was revised to update the current revision levels in the references, to provide more technical clarification in the definitions section, and to further define glass substrates and light wedges.