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Watch: Cal Fire S-2T Firefighting Trackers Are Busy Every Fire Season

These Veteran Navy Trackers Have Been Rebuilt and Reborn as Tanker-Bombers

By thomas hays from Stillwater, US (crown fire leona valleyUploaded by Matthewedwards) [CC BY 2.0 (], via Wikimedia Commons

Born to hunt Soviet submarines, Grumman’s S-2 Tracker or Stoof has been adapted to do several jobs over the years. From the C-1A Trader COD to the Stoof with a Roof E-1 Tracer AEW platform and the ubiquitous US-2 utility transport, the aircraft has done everything asked of it. Nowadays a few Stoofs and CODs fly in civilian hands as warbirds. Over the years Trackers were also adapted for use as aerial firefighting tankers. Today, the California Department of Forestry & Fire Protection or Cal Fire operates 23 turbine-powered S-2T aerial firefighting, or fire-hunting, tankers.

By thomas hays from Stillwater, US (crown fire leona valleyUploaded by Matthewedwards) [CC BY 2.0 (], via Wikimedia Commons
During and since the 1970s Cal Fire and others operated Firecats, which were Trackers powered by the original Wright R-1820-82WA radial engines but modified with a raised cabin floor to fit a retardant tank in the bomb bay. Today’s S-2Ts are relatives of those first Tracker Tankers. All Tracker conversions removed the anti-submarine warfare (ASW) mission equipment and faired over the ventral radar housing (radome) and the tail-mounted magnetic anomaly detector (MAD) sensor and extending boom located under the rudder aft. The plumbing for hot loading the retardant tank is connects there now. These modifications removed about 3,300 pounds from the Tracker. There are no more radial engine-powered Trackers in firefighting service.

Old school S-2 Tracker Tanker. Image via Cal Fire

Built by Grumman Aerospace at their Bethpage plant on New York’s Long Island at least one generation ago, the S-2Ts were mostly S-2E or S-2G variants while operated by the US Navy. Cal Fire acquired the S-2 airframes in 1996 and Marsh Aviation in Arizona converted them to aerial firefighting tankers. The Turbine Trackers are faster than stock S-2s but their Garrett TPE331-14GR turbine engines only put out about 100 more horsepower each than the original Wright R-1820-82WA radial engines did. The S-2Ts are also usually crewed by a single pilot and can haul up to 1,200 gallons of retardant or water.

By Alan Radecki Akradecki [GFDL ( or CC BY-SA 3.0 (], from Wikimedia Commons
On 7 October 2014 at 1630 local time, 13-year veteran S-2T pilot Geoffrey “Craig” Hunt was killed when the aircraft he was flying, Tanker 81, struck trees and crashed while flying a retardant drop on the Dog Rock Fire near Yosemite National Park in California. The loss of the S-2T, Navy Bureau Number (BuNo) 152838 and registered as N449DF, left Cal Fire’s fleet of S-2Ts at 22 aircraft. A replacement S-2T, Tanker 79, has now entered service. The tanker tail number 81 was retired by Cal Fire in memory of Hunt, a former Navy P-3 Orion pilot and 20-plus year Reservist.

By thomas hays from Stillwater, US (crown fire leona valleyUploaded by Matthewedwards) [CC BY 2.0 (], via Wikimedia Commons
The video Load and Return was uploaded to YouTube by Alan Simmons.

The video Cal Fire Sonoma was uploaded to YouTube by Ed Whisenant. A Cal Fire Rockwell OV-10 Bronco makes an appearance in the video.

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Bill Walton

Written by Bill Walton

Bill Walton is a life-long aviation enthusiast and expert in aircraft recognition. As a teenager Bill helped his engineer father build an award-winning T-18 homebuilt airplane in their Wisconsin basement. Bill is a freelance writer, an avid sailor, engineer, announcer, husband, father, uncle, mentor, coach, and Navy veteran. Bill lives north of Houston TX with his wife and son under the approach path to KDWH runway 17R, which means they get to look up at a lot of airplanes. A very good thing.

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