The Valve,piston, cataloged under National Stock Number 1660-01-050-5844, is classified within Federal Supply Class 1660 (Aircraft Air Conditioning, Heating, and Pressurizing Equipment) of the Aircraft Components and Accessories group. The manufacturer of record is United Dynamics, Inc. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1660-01-050-5844 |
| Primary Part Number | 21071000-01 |
| Item Name | Valve,piston |
| FSC / FSG | 1660 / 16 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment |
| Manufacturer | United Dynamics, Inc |
| Status | ACTIVE |
| General Characteristics Item Description | ALUMINUM ALLOY 6061-T6 QQ-A-225/8,HARD ANODIZE MIL-A-8625 TYPE III CLASS 1,3.388 IN. LG,1.993 IN. W 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 |
| Part Number | Manufacturer |
|---|---|
| 21071000-01 | United Dynamics, Inc (USA) |
| 06215844 | Szczypski, Michael (USA) |
| Reference | Meaning |
|---|---|
| 503605 | 3/2 Design control — primary reference U.S. Government activity |
NSN 1660-01-050-5844 is a Valve,piston, manufactured by United Dynamics, Inc, classified under FSC 1660, Aircraft Air Conditioning, Heating, and Pressurizing Equipment. Status: active.
NSN 1660-01-050-5844 has 2 manufacturer part numbers on file: 21071000-01 (United Dynamics, Inc), 06215844 (Szczypski, Michael).
4 possible matches (shared part number, not a government interchangeability claim): 5815-01-127-6558, 6910-01-188-9844, 5825-01-448-4076. Verify interchangeability with system specifications before substitution.
Key specifications for 21071000-01: General Characteristics Item Description: ALUMINUM ALLOY 6061-T6 QQ-A-225/8,HARD ANODIZE MIL-A-8625 TYPE III CLASS 1,3.388 IN. LG,1.993 IN. W IN; End Item Identification: ACFT F16A/B U/O VALVE P/N503600. 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 1660-01-050-5844 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.