National Stock Number
1660-00-451-2161
National Stock Number (NSN) 1660-00-451-2161, or NIIN 004512161, (duct assembly,air conditioning-heating,aircraft) was assigned May 12, 1971 in the Federal Logistics Information System (FLIS). NIIN 004512161 was cancelled on August 9, 1997, with a cancelled status of "Item is Cancelled WITHOUT Replacement." There is no known replacement specified for this stock number. This NSN does not replace any other NSNs.
There are no manufacturer part numbers associated to this NSN.
This part number has not been procured by the US Government in over 5 years.
This NSN is assigned to Item Name Code (INC) 32351. [A HOLLOW BODY USED TO TRANSPORT AIR TO VARIOUS PARTS OF THE AIRCRAFT FOR THE PURPOSE OF HEATING, COOLING, PRESSURIZING, DE-ICING, AND THE LIKE. IT MAY INCLUDE FLANGE(S), BRACKET(S), AND THE LIKE FOR MOUNTING PURPOSES. EXCLUDES:PIPES USED IN AIRCRAFT EXHAUST SYSTEMS AND PIPES USED IN NON-AIRCRAFT APPLICATIONS. EXCLUDES:PIPE, EXHAUST AND PIPE, AIR CONDITIONING-HEATING.]. There is no data in the HMIRS and the NSN is in an FSC not generally suspected of containing hazardous materials. NSN 1660004512161 contains an unknown precious metal.
This information was last updated on Aug 01, 2025.