Ex US Army serial 79-23286, registered to Timberline Helicopters as N286TH in late 2016. High Performance Helicopters took it on board in 2017 and used it for trial and certification flights of (Australian company) Helitak's Fire Tank FT4500 system. Certified in January 2020, the water tank is seen here mounted under the heli's cabin, measuring only 12 inches in it's empty profile. It takes the - also visible - orange HP6000 snorkel pump just 46 seconds to fill the 1100 US-Gallon tank, which then expands under the belly. After the drop, it automatically retracts to its empty profile again.