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The CDF Aviation Management Program

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CDF Aviation Management Program

The CDF Aviation Management Program is a branch of the California Department of Forestry and Fire Protection (known also as Cal Fire). Due to the frequency and severity of wildfires in California, the state has elected to establish its own aerial firefighting force rather than rely solely on national resources. The Aviation Management Program is based at McClellan Airfield near Sacramento, California.


In support of its ground forces, the California Department of Forestry and Fire Protection (CDF) emergency response air program includes 23 Grumman S-2T 1,200 gallon airtankers, eleven UH-1H Super Huey helicopters, and 14 OV-10A airtactical aircraft. These aircraft are stationed at 13 air attack and nine helitack bases located statewide, and can reach most fires within 20 minutes. During high fire activity, CDF may move aircraft to better provide statewide air support.

The airtactical planes fly overhead at a fire, directing the airtankers and helicopters to critical areas of the fire for retardant and water drops. The retardant used to slow or retard the spread of a fire is a slurry mix consisting of a chemical salt compound, water, clay or a gum-thickening agent, and a coloring agent. While both air tankers and helicopters are equipped to carry fire retardant or water, the helicopters can also transport firefighters, equipment and injured personnel.

The average annual budget of the CDF Aviation Management Program is nearly $20 million. A total of 18 CDF personnel oversee the program with an additional 130 contract employees providing mechanical, pilot and management services.

CDF's current support contractors are DynCorp and Logistics Specialties Incorporated (LSI). DynCorp provides airtanker and airtactical aircraft pilot services, and all aircraft maintenance services. All CDF helicopters are flown by CDF pilots. LSI provides procurement and parts management services.

The possibility of using aircraft for fighting wildland fires in California was first proposed in 1931 and again in the late 1940s after World War II. In 1953, the Nolta brothers of Willows, California proposed using their agriculture spray planes for fighting brush and grass fires. During the four fire seasons from 1954-1957, CDF used several small airtankers on a call-when-needed basis. These were primarily spray airplanes converted for use as firefighters. Also during this period, several enterprising aviation companies had been converting World War II TMB Avengers for air tanker use. Thus, in 1958 CDF first contracted for air tanker services with private aviation companies. That year contracts were let for three N3N, four Stearman and four TBM Avenger air tankers. The N3Ns and Stearmans were World War II biplanes used for pilot training and converted for use as agricultural spray planes. They were capable of carrying up to 200 gallons of fire retardant chemicals. The TBM, a World War II torpedo bomber, could deliver 600 gallons.

During the ensuing years other aircraft were converted to air tankers and used by CDF. Among these were the A-26 Invader, Twin Beech, Boeing B-17, Consolidated PBY, and Grumman F7F. The air tanker program continued to expand until finally in the early 1970s, a total of 14 TBMs, five F7Fs, one PBY and one B-17 comprised the CDF fleet.

By 1970, concerns with maintainability and accidents occurring in the TBM fleet led to an evaluation of the Grumman S-2 Tracker as a new generation air tanker. Although they were still active in the Navy, four were loaned to CDF for the evaluation. The Army Aviation Test Facility at Edwards Air Force Base completed a test program that showed the S-2 was a suitable replacement for the TBM. Two S-2 prototype air tankers were placed in service in 1973 with the prototype tank being built at the CDF Mobile Equipment Facility in Davis and the S-2 modification being completed by Hemet Valley Flying Service. These conversions were accomplished using plans developed by Ontario Lands and Forests in Ontario, Canada.

Three TBM accidents in 1973 and three F7F accidents in 1974 accelerated the CDF S-2 modification program. As a result, contracts were entered into with four California contractors, Aero Union Corp., Sis-Q Flying Service, TBM Inc. and Hemet Valley Flying Service to modify and tank ten S-2 air tankers during the 1973/1974 winter period. As a result, 12 S-2As were placed in service in 1974 and five more were built by Bay Aviation Services and put into the fleet for the 1975 fire season.

Three separate leases with the U.S. Navy brought a total of 55 S-2s and 60 engines for the program. This allowed CDF to keep the fleet going until the mid-1990s when it was decided to upgrade from S-2A to S-2T air tankers. In 1987, CDF entered into an agreement with Marsh Aviation of Mesa, Arizona to build a prototype S-2T. This prototype was placed in service and used at several bases. The success of the prototype led to acquisition of 26 S-2E/G aircraft in 1996. The E/G series S-2 was larger and newer. It could haul 1200 gallons of retardant with two TPE-331 GR turboprop engines at speeds in excess of 200 kn (370.4 km/h). A contract for building 23 of the new S-2T airtankers was entered into, with 13 delivered by the end of 2002, seven additional aircraft delivered and placed in service by the end of 2004 and the final three in 2005. As the new air tankers were delivered and placed in service, the original S-2As are retired.

In 2007, CDF contracted with 10 Tanker Air Carrier for three years' of exclusive use of their DC-10 "super tanker" known as Tanker 910, at a cost of $5 million per year.

In the mid-1970s, CDF found that the contractor-owned air tactical planes, mostly single-engine Cessna 182s and Cessna 210s, did not provide the airspeed and safety needed for the new air tanker program. In 1974, CDF acquired 20 retired USAF Cessna O-2 observation aircraft from Davis-Monthan Air Force Base. These O-2s had been forward air control aircraft in Vietnam, had been shipped back to the United States in containers and were disassembled and on pallets when they arrived at CDF's Fresno maintenance facility. A crew of California Conservation Corp (CCC) members reassembled the aircraft. They were placed in service in 1976. The O-2 program was a success and served the Department for more than 20 years.

In 1993, CDF obtained 16 twin-engine turbine-powered North American OV-10A aircraft from the U.S. Navy. The OV-10s replaced the O-2s as the CDF's next-generation air tactical platform.


In 1960 the Division of Forestry decided to experiment with a small, skilled initial attack, or "helitack" crew to be transported by helicopter to increase the early arrival of manpower and equipment to an initial attack fire. Although the crews were trained for hover jumping and had purchased heli-jump suits from the US Forest Service, it was never found necessary to make a jump. Six helitack bases were established in the early 1970s. They were staffed with contracted Bell JetRangers. A typical CDF helitack crew which responded with the helicopter consisted of one fire captain and two to three seasonal firefighters.

CDF began using contractor-owned helicopters for fire control in the mid 1960s. Bell 47, Hiller FH1100, Bell 206 JetRangers and Aerospatiale Alouettes were used the most through the 1970s. The helicopters were located at CDF facilities which protected high value timberlands and critical watershed areas generally in Northern and Central California with one located at Ryan Field in Southern California. The helicopter began playing an increasing role in the Department's Initial Attack strategy during the late 70s. In 1978 three Bell 205 medium helicopters were hired in addition to the standby helicopters. One helicopter was located at the Howard Forest, Mendocino Ranger Unit Headquarters. The other two were located at Hemet/Ryan Field and the Monte Vista, San Diego Ranger Unit Headquarters. Each of the medium helicopters was assigned 11 person helitack crews. Unfortunately, in the mid to late 1970s CDF experienced an increased accident rate throughout the helicopter program. Five accidents involving contractor-owned Bell Jet Rangers occurred in 1979.

As a result of the accidents, CDF decided that better approach would be for the agency to own and operate its own helicopters. In 1981, CDF leased 12 excess UH-1F Hueys which had previously been used by the USAF in Vietnam. Nine helicopters were initially reconditioned, and were operated as non-certificated, public-use aircraft. The first helicopter was built up November, 1981 and was placed in service at Hemet-Ryan Helitack Base. Six more F Model Hueys were built up and placed in service at helitack bases throughout California in the summer of 1982. During the first two years CDF employed “Personal Service Contract” pilots. Each base was assigned a full-time pilot and a seasonal relief pilot who covered two bases. The majority of the contract pilots became state employees in 1984. The helitack unit was designed to be a cohesive unit which consisted of the helicopter and helitack crew. A typical configuration for the helicopter was a Helitack Fire Captain in the copilot's seat and a Helitack Fire Captain plus six fire-fighters in the passenger compartment. The water bucket was replaced in 1984 with a newly designed Canadian 324-gallon Bambi bucket. In the mid-1980s, fixed water dropping tanks were installed on several helicopters. Water bucket operations over ever-increasing populated regions in the urban interface areas of eastern Riverside County had been causing a concern. An accidental drop of a water bucket could cause catastrophic results, while a fixed tank reduced the exposure. In addition, some areas where the helicopters operated had few water sources from which a helicopter could fill its bucket. A fixed tank allowed the helicopter to obtain water from sources previously unobtainable with the bucket.

As the 1991 lease agreement expiration date with the USAF rapidly approached, the Department started a search for a replacement that ultimately resulted in the acquisition in 1989 of the UH-1H. The airframes that the Department obtained were part of 100 that had been released by the Department of Defense to the Forest Service for distribution to states as Federal Excess Personal Property (FEPP) for wildland fire fighting.

The UH-1H aircraft were significantly modified to meet CDF’s specialized needs. The modified helicopters were designated as "Super Hueys". The Super Huey sported a larger, more powerful engine, transmission and rotor system. The tail boom and tail rotor were also modified to accommodate the engine, giving the aircraft greater performance than the standard U.S. Army UH-1H helicopters in hotter and higher conditions typical of California.

Both the F model and the Super Huey maintenance programs were developed by CDF using the most restrictive overhaul/replacement criteria of the military or Bell Helicopter. All maintenance is performed by contract mechanics. Big Valley built up and maintained the F model helicopters from 1981 to 1990 at their Stockton facility. They also started building up the first Super Hueys in 1989. San Joaquin Helicopters completed the Super Huey build-ups and maintained them in their facility in Yolo County and later at the Aviation Management facility at Mather Field in Sacramento from 1989 to 1999. DynCorp was awarded the contract in 2000 and continued to maintain the Super Hueys at Mather and later at McClellan Airfield in North Highlands, California.