Transparent parts, such as aircraft windshields and windows, can be inspected using this practice, and the amount of optical distortion or deviation can be measured. The measurement can be checked for acceptability against the specification for the part. The photograph (digital file, print or negative) can be maintained as a permanent record of the optical quality of the part.

1. Scope

1.1 This photographic practice determines the optical distortion and deviation of a line of sight through a simple transparent part, such as a commercial aircraft windshield or a cabin window. This practice applies to essentially flat or nearly flat parts and may not be suitable for highly curved materials.

1.2 Test Method F 801 addresses optical deviation (angluar deviation) and Test Method F 2156 addresses optical distortion using grid line slope. These test methods should be used instead of Practice F 733 whenever practical.

1.3 This standard does not purport to address the safety concerns 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.

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

F801 Test Method for Measuring Optical Angular Deviation of Transparent Parts

F2156 Test Method for Measuring Optical Distortion in Transparent Parts Using Grid Line Slope

Keywords

distortion; grid-line slope; optical deviation; optical distortion; transparency quality; Aerospace transparent enclosures; Aircraft materials/applications; Deviation; Distortion; Double-exposure method; Grid-line slope; Optical distortion/deviation; Optical materials/properties/tests--aerospace materials; Photography/photographic processing; Transparent materials; Windshields;

ICS Code

ICS Number Code 49.035 (Components for aerospace construction)

Citing ASTM Standards

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