The Fan Assembly,centrifugal, cataloged under National Stock Number 4140-01-550-6540, is classified within Federal Supply Class 4140 (Fans, Air Circulators, and Blower Equipment) of the Refrigeration, AC, and Air Circulating Equipment group. The manufacturer of record is Naval Sea Systems Command. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4140-01-550-6540 |
| Primary Part Number | 7660741 |
| Item Name | Fan Assembly,centrifugal |
| FSC / FSG | 4140 / 41 — Fans, Air Circulators, and Blower Equipment |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| 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 |
|---|---|
| 7660741 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| MMMFERBK230 | 5/9 Secondary reference Advanced Acoustic Concepts, Inc. |
| MMMFERBK230 | C/1 Advisory reference — outside the item-of-supply concept Lockheed Aeronautical Systems Co |
NSN 4140-01-550-6540 is a Fan Assembly,centrifugal, manufactured by Naval Sea Systems Command, classified under FSC 4140, Fans, Air Circulators, and Blower Equipment. Status: active.
NSN 4140-01-550-6540 has 1 manufacturer part number on file: 7660741 (Naval Sea Systems Command).
Key specifications for 7660741: Part Name Assigned by Controlling Agency: (INAVY)FAN ASSY; End Item Identification: AN/SQQ-89(V)6/10/14 DDG SIPS ESS;AN/SQQ-89(V)2/9 FFG SIPS ESS;AN/SQQ-89(V)3/7/12 CG SIPS ESS;AN/SQQ-89(V)6/76 DDG 63 SIPS ESS. 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.
NSN 4140-01-550-6540 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.