Kawak receives STC’s for new Chinook Internal firefighting tank

The tank can hold 2,500 gallons

Above: The test rig for the new Kawak 2,500-gallon internal tank. Kawak photo.

Kawak Aviation has received FAA Supplemental Type Certification (STC) for its CH-47D Chinook aerial liquid delivery system (ALDS) and auxiliary hydraulic system. The 2,500-US gallon (9,463-liter) tank fills in under 40 seconds and can release a full load of water in 3 seconds. The system is built around a fully independent 50hp hydraulic system, a new refill pump, and unique design of the water tank door.

Using their existing refill pump technology as a starting point, they designed an all new pump to meet the fill time requirements of the new system.

“Unlike swinging door designs, our sliding doors provide an unbroken ribbon of water that exits the tank with less wind break up providing a better drop pattern. In short more water reaches the fire for a more effective drop,” said Andrew  Sawyer, director of marketing.

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Test fitting the first 2,500 gallon riveted tank prior to final riveting.

The system includes a secondary 128-US gallon tank that can add foam concentrate if needed as the main tank is filled. A live telemetry functionality automatically records how much water is taken on, how much is dropped, and where. This information is then transmitted to the agency managing the fire to assist in analyzing utilization of resources.

Having completed flight testing and received the STC, Billing’s Flying Service will be using the tank this summer.

(All photos are provided by Kawak)

billings flying service Kawak internal tank chinook firefighting wildfire
Billings CH47D flight testing the new internal tank.
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Kawak CH-47D firefighting system drop test.

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