The Valve Assembly,environmental Con, cataloged under National Stock Number 1660-01-426-3043, 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 Triumph Engine Control Systems Llc. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1660-01-426-3043 |
| Primary Part Number | 7-511A21527-1 |
| Item Name | Valve Assembly,environmental Con |
| FSC / FSG | 1660 / 16 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment |
| Manufacturer | Triumph Engine Control Systems Llc |
| Status | ACTIVE |
| General Characteristics Item Description | USED TO CONTROL THE ENVIRONMENTALSYSTEM |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 7-511A21527-1 | The Boeing Company (USA) |
| 7-511A21527-1 PRIMARY | Triumph Engine Control Systems Llc (USA) |
| Reference | Meaning |
|---|---|
| E131027000 | 5/9 Secondary reference Triumph Thermal Systems - Maryland, Inc. |
NSN 1660-01-426-3043 is a Valve Assembly,environmental Con, manufactured by Triumph Engine Control Systems Llc, classified under FSC 1660, Aircraft Air Conditioning, Heating, and Pressurizing Equipment. Status: active.
NSN 1660-01-426-3043 has 2 manufacturer part numbers on file: 7-511A21527-1 (The Boeing Company), 7-511A21527-1 (Triumph Engine Control Systems Llc).
Key specifications for 7-511A21527-1: General Characteristics Item Description: USED TO CONTROL THE ENVIRONMENTALSYSTEM; End Item Identification: USED ON AH-64A A. 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 1660-01-426-3043 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.