The Conair Firecat is a fire-fighting aircraft developed in Canada in the 1970s by modifying military surplus aircraft. The modifications were developed by the maintenance arm of the Conair Group, now a separate company called Cascade Aerospace.
Airplanes - Civilian - Parked - Propeller
The Firecats are retrofitted Grumman S-2 Trackers. Conair bought a large number of Trackers formerly operated by the Canadian Navy and a small number of ex-United States Navy aircraft as well. The Trackers are modified for aerial firefighting as Firecats by raising the cabin floor by 20 cm (8 in) and fitting a 3,296 litre (870 U.S. gal) retardant tank where the torpedo bay is normally located.
Links: en.wikipedia.org, www.airliners.net