Aviation Investigation Report A98H0003

1.19.10  Use of Computer Fire Modelling

To complete the fire investigation, there was a requirement for a better understanding of the effects, or lack thereof, of numerous variables. The TSB elected to further advance its fire investigation by incorporating the knowledge gained from the fire tests conducted at the Aircraft Fire Safety Section at the FAA's William J. Hughes Technical Center in Atlantic City, New Jersey, into a computer model. Using the computer model, additional work was completed to analyze fire dynamics using fire field modelling techniques.

Field models are based on an approach that divides the region of interest into a large number of small elemental volumes. These volumes are each systematically analyzed in increments to determine the overall effect or effects. The approach is computationally intensive and complex, but provides superior results when compared to other techniques, such as zone models, that take a much more simplistic approach to the number and size of elemental volumes analyzed. In the SR 111 occurrence, factors such as complex airframe and duct system geometries necessitated a fire field analysis approach, as opposed to a zonal approach.

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Date modified :
2012-07-27