| Title | Readability of self-illuminated signs in a smoke-obscured environment. |
|---|---|
| Record ID | 39388 |
| Personal Name Creator |
Rasmussen, P.G.; Garner, J.D.; Blethrow, J.G.; Lowrey, D.L. |
| Corporate Creator | Civil Aeromedical Institute |
| Corporate Contributor |
United States. Office of Aviation Medicine |
| Publisher | Civil Aerospace Medical Institute |
| Publication Date | 19791100 |
| Language | English |
| 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. |
| Rosap ID | dot:21175 |
| Rosap URL | https://rosap.ntl.bts.gov/view/dot/21175 |
| TRT Terms | Air transportation crashes; Smoke; Visual perception; Distance perception; Vision tests; Emergency exits; Signals; Lighting; Luminance; Experiments; Human subject testing |
| General Subjects | Aircraft accidents; Smoke; Visual acuity; Vision--Testing; Signals and signaling; Luminescence |
| Classification | NTL - SAFETY AND SECURITY - Accidents; NTL - SAFETY AND SECURITY - Aviation Safety/Airworthiness; NTL - SAFETY AND SECURITY - Human Factors; NTL - AVIATION - Aviation Human Factors; NTL - AVIATION - Aviation Safety/Airworthiness |
| Geographical Coverage |
United States |
| Report Number | FAA-AM-79-22; DOT/FAA/AM-79/22 |
| Resource type | Tech Report |
| URL | https://ntlrepository.blob.core.windows.net/lib/39000/39300/39388/AM79-22.pdf |
| Format | |
| Database | NTL Digital Repository |