The Duct Assembly,air Conditioning-H, cataloged under National Stock Number 1660-01-604-6678, 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 Senior Uk Limited Div Senior Aerospace Bwt. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1660-01-604-6678 |
| Primary Part Number | BWT30957-33 |
| Item Name | Duct Assembly,air Conditioning-H |
| FSC / FSG | 1660 / 16 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment |
| Manufacturer | Senior Uk Limited Div Senior Aerospace Bwt |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 901-325-334-133 | The Boeing Company (USA) |
| BWT30957-33 PRIMARY | Senior Uk Limited Div Senior Aerospace Bwt (GBR) |
| Reference | Meaning |
|---|---|
| 901-325-334 | D/9 Drawing number reference only The Boeing Company |
NSN 1660-01-604-6678 is a Duct Assembly,air Conditioning-H, manufactured by Senior Uk Limited Div Senior Aerospace Bwt, classified under FSC 1660, Aircraft Air Conditioning, Heating, and Pressurizing Equipment. Status: active.
NSN 1660-01-604-6678 has 2 manufacturer part numbers on file: 901-325-334-133 (The Boeing Company), BWT30957-33 (Senior Uk Limited Div Senior Aerospace Bwt).
2 possible matches (shared part number, not a government interchangeability claim): 1660-01-604-9612, 1660-01-605-9012. Verify interchangeability with system specifications before substitution.
Key specifications for BWT30957-33: Part Name Assigned by Controlling Agency: DUCT SEAT DROPDOWN; End Item Identification: V-22. 0 specifications are 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.
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.