The Heat-Exchanger, cataloged under National Stock Number 4420-01-660-5890, is classified within Federal Supply Class 4420 (Heat Exchangers and Steam Condensers) of the Furnace, Steam, Drying, Nuclear Reactors group. The manufacturer of record is Lockheed Martin Corporation Div Rms - Manassas. Government technical data includes 1 specification, cited from the U.S. Government catalog. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4420-01-660-5890 |
| Primary Part Number | N147977 |
| Item Name | Heat-Exchanger |
| FSC / FSG | 4420 / 44 — Heat Exchangers and Steam Condensers |
| Manufacturer | Lockheed Martin Corporation Div Rms - Manassas |
| Status | ACTIVE |
| Criticality Code Justification | FEAT |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | Y |
| Part Number | Manufacturer |
|---|---|
| N147977 PRIMARY | Lockheed Martin Corporation Div Rms - Manassas (USA) |
| FHC0089879 | General Dynamics Mission Systems, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 2265001 | 5/1 Secondary reference Rotron Incorporated |
NSN 4420-01-660-5890 is a Heat-Exchanger, manufactured by Lockheed Martin Corporation Div Rms - Manassas, classified under FSC 4420, Heat Exchangers and Steam Condensers. Status: active.
NSN 4420-01-660-5890 has 2 manufacturer part numbers on file: N147977 (Lockheed Martin Corporation Div Rms - Manassas), FHC0089879 (General Dynamics Mission Systems, Inc.).
Key specifications for N147977: Criticality Code Justification: FEAT; Special Features: A PART, ASSEMBLY, OR SYSTEM IDENTIFIED AS ESSENTIAL TO WEAPON SYSTEM PERFORMANCE OR OPERATION TO PRESERVE LIFE AND SAFETY OF PERSONNEL. 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 4420-01-660-5890 has DEMIL Code Q. 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.