NSN 1660-00-567-6991, 1660005676991
COVER,VALVE

Federal Supply Classification: FSC 1660 - Aircraft Air Conditioning, Heating, and Pressurizing Equipment
National Item Identification Number: NIIN 005676991
Codification Country: United States
Item Name Code: INC 77777
Criticality: (F) This item is a Flight Safety Critical Aircraft Part (FSCAP).
Hazardous Material Indicator Code: (N) There is no data in the HMIRS and the NSN is in an FSC not generally suspected of containing hazardous materials.

Availability: Readily Available Qualified Suppliers: Currently qualifying suppliers

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DLMS^® Summary

National Stock Number 1660-00-567-6991

National Stock Number (NSN) 1660-00-567-6991, or NIIN 005676991, (cover,valve) was assigned January 1, 1963 in the Federal Logistics Information System (FLIS). This NSN does not replace any other NSNs.

There are 2 manufacturer part numbers associated with this NSN. One of those part number(s) are considered obsolete. The manufacturer part numbers were originally supplied by 4 suppliers. Today, 3 suppliers are listed as Active suppliers for this NSN. Of the active suppliers, only one supplier is deemed design controlled or valid supply parts.

This part number is actively being procured by the US Government, with procurement history within the last 90 days. There have been 19 contracts issued for this part number, with 47 awards given. There is minimal competition for this NSN. The US Government has awarded contracts to 2 different suppliers. The last contract numbers awarded were: SPE4AX25F3879, SPE4AX25F3879, SPE4AX25F3879, SPE4AX25F3879, SPE4AX25F3879. The total value of the awarded contracts has been US$ 1,207,620.95.

This NSN is somewhat common among different platforms, belonging to 6 different weapons systems.

There has been very little demand for this national stock number. The demand for this NSN originated from less than 5 countries. Based on a planned procurement review by the Primary Inventory Control Activity (PICA) on Jul 02, 2006, this NSN's acquisition method was noted as: Acquire directly from the actual manufacturer, whether or not the prime contractor is the actual manufacturer. The rights to use the data needed to purchase this part from additional sources are not owned by the Government and cannot be purchased. Valid AMCs: 1, 2, 3, 4 and 5.

This NSN is assigned to Item Name Code (INC) 77777. This item is a Flight Safety Critical Aircraft Part (FSCAP). There is no data in the HMIRS and the NSN is in an FSC not generally suspected of containing hazardous materials. NSN 1660005676991 does not contain precious metals.

This information was last updated on Jun 01, 2025.

Technical Characteristics

END ITEM IDENTIFICATION: (AGAV) 1660-00-571-9153;1660-00-671-6380,REGULATOR,AIR PRESSURE
GENERAL CHARACTERISTICS ITEM DESCRIPTION: (TEXT) ALUM ALLOY PER QQ-A-591;6.6250 IN. DIA BY 0.570 IN. LG O/A;FOUR 0.132 IN. DIA HOLES EQUALLY SPACED ON 0.938 IN. DIA BOLT CIRCLE;TWELVE 0.101 IN. DIA HOLES EQUALLY SPACED ON 5.956 IN. DIA BOLT CIRCLE
GENERAL CHARACTERISTICS ITEM DESCRIPTION: (TEXT) FALUM ALLOY PER QQ-A-591;6.6250 IN. DIA BY 0.570 IN. LG O/A;FOUR 0.132 IN. DIA HOLES EQUALLY SPACED ON 0.938 IN. DIA BOLT CIRCLE;TWELVE 0.101 IN. DIA HOLES EQUALLY SPACED ON 5.956 IN. DIA BOLT CIRCLE