National Stock Number
1660-99-721-3149
National Stock Number (NSN) 1660-99-721-3149, or NIIN 997213149, (refrigeration unit,air cycle,aircraft) has an unknown assigned date. This NSN replaces 1 stock number, 1660011759051.
There is only one manufacturer part number associated with this NSN. None of the associated part number(s) are considered obsolete. The manufacturer part numbers were originally supplied by one supplier. Today, one supplier is listed as an Active supplier for this NSN. Of the active suppliers, there are no suppliers that are deemed design controlled or valid supply parts.
This part number has not been procured by the US Government in over 5 years.
This NSN is assigned to Item Name Code (INC) 61423. [A UNIT DESIGNED TO PROVIDE COOL AIR IN AN AIRCRAFT AIR CONDITIONING SYSTEM FOR DISTRIBUTION TO CABIN AND/OR COMPARTMENTS. IT IS AN AIR CYCLE TYPE UNIT USING AIR AS THE REFRIGERANT MEDIA. BASICALLY CONSISTS OF A COOLING TURBINE AND A HEAT EXCHANGER. PERFORMS COOLING BUT DOES NOT CONDITION AIR. IT IS USED IN CONJUNCTION WITH CONTROL VALVES BUT IN ITSELF HAS NO MEANS FOR CONTROLLING THE TEMPERATURE OR THE AIR IT IS PROVIDING.].
This information was last updated on Nov 05, 2025.