The Exhaust Valve,butterfly, cataloged under National Stock Number 1720-01-309-8239, 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 D. L. Martin Co.. The record lists 3 manufacturer part numbers 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1720-01-309-8239 |
| Primary Part Number | 17-61552-3 |
| Item Name | Exhaust Valve,butterfly |
| FSC / FSG | 1720 / 17 — Aircraft Launching Equipment |
| Manufacturer | D. L. Martin Co. |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL D — Destroy Item |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | F |
| Part Number | Manufacturer |
|---|---|
| 17-61552-3 | D. L. Martin Co. (USA) |
| 17-61552-3 | The Entwistle Company Llc (USA) |
| 17-61552-3 | Spectronics Corporation (USA) |
| Reference | Meaning |
|---|---|
| BML3494D | 5/2 Secondary reference U.S. Government activity |
| 17-61552-3 | 3/2 Design control — primary reference U.S. Government activity |
NSN 1720-01-309-8239 is a Exhaust Valve,butterfly, manufactured by D. L. Martin Co., classified under FSC 1720, Aircraft Launching Equipment. Status: active.
NSN 1720-01-309-8239 has 3 manufacturer part numbers on file: 17-61552-3 (D. L. Martin Co.), 17-61552-3 (The Entwistle Company Llc), 17-61552-3 (Spectronics Corporation).
Key specifications for 17-61552-3: End Item Identification: AIRCRAFT LAUNCH AND RECOVERY EQUIPMENT. 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 1720-01-309-8239 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.