explosion suppression systems

Date:         01 Aug 97 04:04:19 
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i remember that in the late 60's airplanes like the boeing 707 and 720B,
maybe also the 727 were equipped with an explosion suppression system
manufactured by a company with the name fenwal or similar. The system
sensed the onset of an explosion (early flame front) and reacted
supposedly fast enough to prevent further progress by triggering a
cartridge with a chemical inerting the surrounding air due to its strong
affinity to oxygen. the system was definitely much cheaper and lighter
than any of the systems discussed now for retrofit in connection with
twa 800.

This system apparently is no longer used. does anyone know for what
reason? was there a basic flaw?