The Piston,bypass Valve, cataloged under National Stock Number 1650-01-140-3988, is classified within Federal Supply Class 1650 (Aircraft Hydraulic, Vacuum, and De-icing System Components) of the Aircraft Components and Accessories group. Government technical data includes 1 specification, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1650-01-140-3988 |
| Item Name | Piston,bypass Valve |
| FSC / FSG | 1650 / 16 — Aircraft Hydraulic, Vacuum, and De-icing System Components |
| Status | ACTIVE |
| General Characteristics Item Description | STAINLESS STEEL PER QQ-S-763,COMPOSITION 420; 1.045 IN. MIN,1.055 IN. MAX LG; 0.419 IN. MIN,0.420 IN. MAX DIA IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 3003081-1 | 5/9 Secondary reference U.S. Government activity |
| 3003081-1 | 3/2 Design control — primary reference U.S. Government activity |
| 3003081-1 | 5/1 Secondary reference Parker-Hannifin Corporation Dba Service and Support Operation Div Services and Support Operations |
NSN 1650-01-140-3988 is a Piston,bypass Valve, classified under FSC 1650, Aircraft Hydraulic, Vacuum, and De-icing System Components. Status: active.
Key specifications for 1650-01-140-3988: General Characteristics Item Description: STAINLESS STEEL PER QQ-S-763,COMPOSITION 420; 1.045 IN. MIN,1.055 IN. MAX LG; 0.419 IN. MIN,0.420 IN. MAX DIA IN. 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.
NSN 1650-01-140-3988 has DEMIL Code B. 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.