The Lock,valve Assembly, cataloged under National Stock Number 1720-01-017-5278, 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 Airtronics, Llc. Government technical data includes 2 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1720-01-017-5278 |
| Primary Part Number | 517814-3 |
| Item Name | Lock,valve Assembly |
| FSC / FSG | 1720 / 17 — Aircraft Launching Equipment |
| Manufacturer | Airtronics, Llc |
| Status | ACTIVE |
| General Characteristics Item Description | STEEL MIL-S-6758 COND A,5.625 IN. O/A LG IN |
| Criticality Code Justification | FEAT |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Part Number | Manufacturer |
|---|---|
| 517814-3 | Airtronics, Llc (USA) |
| 517814-3 | Form Fit & Function Llc Div F3 (USA) |
| Reference | Meaning |
|---|---|
| 517814-2 | 5/9 Secondary reference U.S. Government activity |
| 517814-1 | 5/9 Secondary reference U.S. Government activity |
| 517814-3 | 3/2 Design control — primary reference U.S. Government activity |
NSN 1720-01-017-5278 is a Lock,valve Assembly, manufactured by Airtronics, Llc, classified under FSC 1720, Aircraft Launching Equipment. Status: active.
NSN 1720-01-017-5278 has 2 manufacturer part numbers on file: 517814-3 (Airtronics, Llc), 517814-3 (Form Fit & Function Llc Div F3).
Key specifications for 517814-3: General Characteristics Item Description: STEEL MIL-S-6758 COND A,5.625 IN. O/A LG IN; Criticality Code Justification: FEAT; Special Features: ESSENTIAL TO WEAPON SYSTEM PERFORMANCE OR OPERATION, OR THE PRESERVATION OF LIFE OR SAFETY OF OPERATING PERSONNEL; End Item Identification: CATAPULT MODEL C7,C11,C13. 2 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 1720-01-017-5278 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.