The Circuit Card Assembly, cataloged under National Stock Number 5998-01-574-6664, is classified within Federal Supply Class 5998 (Electrical and Electronic Assemblies, Boards, Cards, and Associated Hardware) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Engineering Concepts & Designs L L C Dba E C D. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 5998-01-574-6664 |
| Primary Part Number | AT520L |
| Item Name | Circuit Card Assembly |
| FSC / FSG | 5998 / 59 — Electrical and Electronic Assemblies, Boards, Cards, and Associated Hardware |
| Manufacturer | Engineering Concepts & Designs L L C Dba E C D |
| Status | ACTIVE |
| Functional Description | CIRCUIT CARD ASSEMBLY CPU BOARD |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL D — Destroy Item |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Shelf Life Code | 0 |
| Criticality Code | X |
| Unit of Issue | EA |
| Acquisition advice code | CH |
| Weight | 5.0000 lbs |
| Cube | 1.7188 cu ft |
NSN 5998-01-574-6664 is a Circuit Card Assembly, manufactured by Engineering Concepts & Designs L L C Dba E C D, classified under FSC 5998, Electrical and Electronic Assemblies, Boards, Cards, and Associated Hardware. Status: active.
NSN 5998-01-574-6664 has 3 manufacturer part numbers on file: 8431144 (Naval Sea Systems Command), AT520L (Engineering Concepts & Designs L L C Dba E C D), 8431144 (W R Systems Ltd Dba Alert).
2 possible matches (shared part number, not a government interchangeability claim): 5998-01-649-9230, 5998-01-668-2589. Verify interchangeability with system specifications before substitution.
Key specifications for AT520L: Functional Description: CIRCUIT CARD ASSEMBLY CPU BOARD; Part Name Assigned by Controlling Agency: CIRCUIT CARD ASSEMBLY; CPU BOARD; End Item Identification: AN/BSN-2 DIGITAL DEPTH DETECTOR. 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 5998-01-574-6664 has DEMIL Code D. 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.