Fire-Extinguishing Methods for New Passenger/Cargo Aircraft

摘要

Full-scale fire tests were conducted to determine the degree to which fire in large cargo compartments may be controlled by the use of bromotrifluoromethane as an extinguishing method in conjunction with ventilation shutoff. Results of the tests, using a 10-percent load, indicated that temperature can be kept below 500F and that a flash fire can be averted for at least 2 hours by the use of as little as 3 percent by volume of bromotrifluoromethane. The rate of agent application was about 3 1/2 pounds per second. The use of liquid nitrogen proved very effective in extinguishing the initial flames, but with the 75 CFM simulated leakage, when the oxygen concentration rose to 12 percent, a flash fire occurred. In both cases the protection lasted just over 30 minutes. The rate of application of the liquid nitrogen was as high as 10 pounds per second. (Author)