Model 3180 OH-58D AHIP Airborne Thermal Control Unit
The Model 3180 Thermal Control Unit is a compact, lightweight, self-contained heat transfer system that operates on 115/200 Vac, 3 phase, 400 Hz power.
This TCU is used on the Advanced Helicopter Improvement Program (AHIP) to remove heat from the electronics payload of the Mast Mounted Sight (MMS), located above the rotor plane on the OH-58D Army helicopter. It permits operation of the MMS under all environmental extremes.
A highly efficient positive displacement pump provides a constant temperature conditioned one gpm water-glycol mixture flow to cold plates in the MMS.
The TCU incorporates a lightweight cast aluminum manifold integrating pump, motor, thermal and check valves, accumulator assembly and cored fluid passages. This totally eliminates fluid tubes and fittings enhancing maintainability and eliminating any potential fluid leakage. A visual level indicator monitors fluid level in the system at all times.
The TCU requires 290 VA power input while handling 396 watts external load with a 17° F rise of coolant temperature above ambient.