The Filter Assembly, cataloged under National Stock Number 1720-00-308-5503, is classified within Federal Supply Class 1720 (Aircraft Launching Equipment) of the Aircraft Launch, Landing, and Ground Handling Equipment group. The manufacturer of record is Westinghouse Electric Corp. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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.
| Item Name | Filter Assembly |
| FSC / FSG | 1720 — Aircraft Launching Equipment (FSG 17) |
| Manufacturers | Westinghouse Electric Corp (CAGE 79500) |
| Parameter | Value |
|---|---|
| NSN | 1720-00-308-5503 |
| Primary Part Number | 820531 |
| Item Name | Filter Assembly |
| FSC / FSG | 1720 / 17 — Aircraft Launching Equipment |
| Manufacturer | Westinghouse Electric Corp |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Part Number | Manufacturer |
|---|---|
| 820531 PRIMARY | Westinghouse Electric Corp (USA) |
| Reference | Meaning |
|---|---|
| B1-1058-23 | 5/9 Secondary reference Entwistle Co the Van Zelm Div |
| 820531 | 5/2 Secondary reference U.S. Government activity |
| 408189-1 | 5/2 Secondary reference U.S. Government activity |
NSN 1720-00-308-5503 is a Filter Assembly, manufactured by Westinghouse Electric Corp, classified under FSC 1720, Aircraft Launching Equipment. Status: active.
NSN 1720-00-308-5503 has 1 manufacturer part number on file: 820531 (Westinghouse Electric Corp).
1 possible match (shared part number, not a government interchangeability claim): 5310-01-382-4094. Verify interchangeability with system specifications before substitution.
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.