H-60/H-47 Series…What Do You Do With the MCU?Posted: 2012/14/11
Mechanics, are you scratching your head trying to figure out why you’ve been losing refrigerant in your microclimate cooling unit, NSN 1680–01-508-6625?
The likely answer to that question is improper storage.
Never store MCUs below freezing for prolonged periods. If you do, the O-rings will shrink and allow refrigerant to leak out.
Store the MCU at temperatures above freezing to prevent loss of refrigerant. Store it in the same packaging it came in. That’s the reusable fast pack MIL-SPEC box. It’s the only authorized packaging able to withstand shipping vibrations and drop shocks.
The good word about proper storage can be found in aviation maintenance information message (AMAM) H-47-MIM-006/H-60-MIM-001, Storage of Microclimate Cooling Unit (MCU) (Jun 11).
Now that the storage issue is solved, what about broken MCUs? Turn in a broken MCU and order a replacement through normal supply channels.