The Piston,regulator, cataloged under National Stock Number 1660-00-804-9226, is classified within Federal Supply Class 1660 (Aircraft Air Conditioning, Heating, and Pressurizing Equipment) of the Aircraft Components and Accessories group. Government technical data includes 1 specification, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 1660-00-804-9226 |
| Item Name | Piston,regulator |
| FSC / FSG | 1660 / 16 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment |
| Status | ACTIVE |
| General Characteristics Item Description | ALUMINUM ALLOY QQ-A-267 2024-T4;ANODIZED AMS 2468;0.375 IN. LG;1.052 IN. FLANGE OD;0.315 IN. BORE ID COUNTERBORED 0.270 IN. DEEP TO 0.423 IN. 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 |
|---|---|
| 22754 | 3/2 Design control — primary reference U.S. Government activity |
NSN 1660-00-804-9226 is a Piston,regulator, classified under FSC 1660, Aircraft Air Conditioning, Heating, and Pressurizing Equipment. Status: active.
3 possible matches (shared part number, not a government interchangeability claim): 6145-00-990-6336, 3455-01-388-0757, 3110-01-477-7699. Verify interchangeability with system specifications before substitution.
Key specifications for 1660-00-804-9226: General Characteristics Item Description: ALUMINUM ALLOY QQ-A-267 2024-T4;ANODIZED AMS 2468;0.375 IN. LG;1.052 IN. FLANGE OD;0.315 IN. BORE ID COUNTERBORED 0.270 IN. DEEP TO 0.423 IN. 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 1660-00-804-9226 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.