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Posted

Probably testing the engine's resistance to water-ingestion. I think similar rigs are used for icing tests but they do not seem to be at high enough altitude for that.

Posted

The USAF tests their weapon systems and platforms for operational standards and design specs as C5 mentioned using this type of spray nozzle which is part of a PAWSS - Palletized Airborne Water Spray System. They can atomize water by sending bleed air cooled by ram air through the nozzle which mixes with the water for different conditions in simulated testing for ice, rain, and clouds. MIL-STD-210B details the specs for climate extremes and I believe 810C details the test methods if you're interested.

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