Readability of self-illuminated signs in a smoke-obscured environment.

Rasmussen, P.G.; Garner, J.D.; Blethrow, J.G.; Lowrey, D.L.; Civil Aeromedical Institute

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Readability of self-illuminated signs in a smoke-obscured environment.

1979-11-01
By Rasmussen, P.G. ; Garner, J.D. ; Blethrow, J.G. ; ...

[PDF-874.85 KB]

English

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Creators:

Rasmussen, P.G. ; Garner, J.D. ; Blethrow, J.G. ; Lowrey, D.L.

Rasmussen, P.G. ; Garner, J.D. ; Blethrow, J.G. ; Lowrey, D.L. Less -
Corporate Creators:

Civil Aeromedical Institute
Corporate Contributors:

United States. Office of Aviation Medicine
Subject/TRT Terms:

[+]

Aircraft Accidents Air Transportation Crashes Distance Perception Emergency Exits Experiments Human Subject Testing Lighting Luminance Luminescence Signals Signals And Signaling Smoke Vision--Testing Vision Tests Visual Acuity Visual Perception
Publication/ Report Number:

FAA-AM-79-22 ; DOT/FAA/AM-79/22

FAA-AM-79-22 ; DOT/FAA/AM-79/22 Less -
Resource Type:

Tech Report
Geographical Coverage:

United States
Corporate Publisher:

Civil Aerospace Medical Institute
Abstract:

This study investigates the ability of people with normal distant visual acuity to identify self-illuminated emergency signs in a smoke-obscured environment. The results indicate that signs whose background luminance meets or exceeds the requirements of Federal Aviation Regulation (FAR) 25.812 are readable under favorable conditions when the total optical density of the smoke between the observer and the signs ranges between 3.00 and 3.55. Substantial increases in character sizes in the signs produce only moderate improvement in readability. Some limitations on the practical application of these data to predicting sign visibility in adverse conditions are discussed.
Format:

PDF
Collection(s):

FAA Civil Aerospace Medical Institute US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:1ac208fb1bcd9a9e326fb96a2a4f6747cfbbdad1472e837bdb84171aa1b29715
Download URL:

https://rosap.ntl.bts.gov/view/dot/21175/dot_21175_DS1.pdf
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Readability of self-illuminated signs in a smoke-obscured environment.

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