The Multiplexer,test, cataloged under National Stock Number 4920-01-226-8549, is classified within Federal Supply Class 4920 (Aircraft Maintenance and Repair Shop Specialized Equipment) of the Maintenance and Repair Shop Equipment group. The manufacturer of record is Northrop Grumman Systems Corporation. Government technical data includes 1 specification, cited from the U.S. Government catalog. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4920-01-226-8549 |
| Primary Part Number | 123PE5020 |
| Item Name | Multiplexer,test |
| FSC / FSG | 4920 / 49 — Aircraft Maintenance and Repair Shop Specialized Equipment |
| Manufacturer | Northrop Grumman Systems Corporation |
| Status | ACTIVE |
| FSC Application Data | AN/ASM-440 TEST SET,IN FLIGHT PERFORMANCE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | N |
| Part Number | Manufacturer |
|---|---|
| 123PE5020 PRIMARY | Northrop Grumman Systems Corporation (USA) |
| Reference | Meaning |
|---|---|
| TD1013ASM440 | 5/1 Secondary reference U.S. Government activity |
| 123PE5020 | 5/9 Secondary reference Northrop Grumman Systems Corporation |
NSN 4920-01-226-8549 is a Multiplexer,test, manufactured by Northrop Grumman Systems Corporation, classified under FSC 4920, Aircraft Maintenance and Repair Shop Specialized Equipment. Status: active.
NSN 4920-01-226-8549 has 1 manufacturer part number on file: 123PE5020 (Northrop Grumman Systems Corporation).
1 possible match (shared part number, not a government interchangeability claim): 5998-01-229-2502. Verify interchangeability with system specifications before substitution.
Key specifications for 123PE5020: FSC Application Data: AN/ASM-440 TEST SET,IN FLIGHT PERFORMANCE; End Item Identification: E-2C AFT. 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.
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.