The Prism,optical Instrument, cataloged under National Stock Number 6650-01-570-7971, is classified within Federal Supply Class 6650 (Optical Instruments, Test Equipment, Components and Accessories) of the Instruments and Laboratory Equipment group. The manufacturer of record is O.c.e.m. Acquisition Corp. Dba Multi Electric Mfg., Inc.. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6650-01-570-7971 |
| Primary Part Number | 2491-09 |
| Item Name | Prism,optical Instrument |
| FSC / FSG | 6650 / 66 — Optical Instruments, Test Equipment, Components and Accessories |
| Manufacturer | O.c.e.m. Acquisition Corp. Dba Multi Electric Mfg., Inc. |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 6650-01-570-7971 is a Prism,optical Instrument, manufactured by O.c.e.m. Acquisition Corp. Dba Multi Electric Mfg., Inc., classified under FSC 6650, Optical Instruments, Test Equipment, Components and Accessories. Status: active.
NSN 6650-01-570-7971 has 2 manufacturer part numbers on file: 2491-09 (O.c.e.m. Acquisition Corp. Dba Multi Electric Mfg., Inc.), 1881C01 (O.c.e.m. Acquisition Corp. Dba Multi Electric Mfg., Inc.).
1 possible match (shared part number, not a government interchangeability claim): 5340-01-590-0968. Verify interchangeability with system specifications before substitution.
Key specifications for 2491-09: End Item Identification: APPROACH LIGHT SYSTEM (ALS). 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 6650-01-570-7971 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.