The Valve Assembly,environmental Con, cataloged under National Stock Number 1660-00-821-4635, is classified within Federal Supply Class 1660 (Aircraft Air Conditioning, Heating, and Pressurizing Equipment) of the Aircraft Components and Accessories group. The manufacturer of record is Mid-America Aerotech, Llc. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1660-00-821-4635 |
| Primary Part Number | 40A842 |
| Item Name | Valve Assembly,environmental Con |
| FSC / FSG | 1660 / 16 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment |
| Manufacturer | Mid-America Aerotech, Llc |
| Status | ACTIVE |
| General Characteristics Item Description | METAL |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 40A842 | Mid-America Aerotech, Llc (USA) |
| Reference | Meaning |
|---|---|
| 40A842 | 3/9 Design control — primary reference U.S. Government activity |
| 40A842 | 5/9 Secondary reference Moog Inc Div Moog Inc., Space and Defense - Salt Lake City |
| 40A842 | 5/9 Secondary reference E-Systems Inc Montek Div Fluid Controls Opns |
NSN 1660-00-821-4635 is a Valve Assembly,environmental Con, manufactured by Mid-America Aerotech, Llc, classified under FSC 1660, Aircraft Air Conditioning, Heating, and Pressurizing Equipment. Status: active.
NSN 1660-00-821-4635 has 1 manufacturer part number on file: 40A842 (Mid-America Aerotech, Llc).
Key specifications for 40A842: General Characteristics Item Description: METAL. 1 specification is documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
NSN 1660-00-821-4635 has DEMIL Code B. Demilitarization may be required before disposal or transfer to non-military entities.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.