The Poppet Assembly,regulator, cataloged under National Stock Number 1660-00-461-8979, 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 2 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1660-00-461-8979 |
| Item Name | Poppet Assembly,regulator |
| FSC / FSG | 1660 / 16 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment |
| Status | ACTIVE |
| FSC Application Data | REGULATOR,ACFT ENVIRONMENTAL SYSTEM,B52 |
| General Characteristics Item Description | SILICONE ELASTOMER,ZZ-R-765,CLASS 3,GRADE 60 SEAT MATERIAL,CORROSIONRESISTING STEEL,AMS 5643,CONDITION A,17-4 PH POPPET MATERIAL,8-32 UNC-3ATHREADS ON POPPET END PER MIL-S-7742,1.455 IN. MIN,1.485 IN. MAX L,0.600IN. MIN,0.610 IN. MAX BASE OD,0.115 IN. MIN,0.125 IN. MAX TIP OD,0.248IN. MIN,0.249 IN. MAX MAIN BODY OD IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 70876 | C/1 Advisory reference — outside the item-of-supply concept Pti Technologies Inc. |
| 70876 | 5/9 Secondary reference Eaton Aerospace Llc Dba Sterer Engineering Div Valve & Actuator |
| 70876 | 3/9 Design control — primary reference Vacco Industries |
NSN 1660-00-461-8979 is a Poppet Assembly,regulator, classified under FSC 1660, Aircraft Air Conditioning, Heating, and Pressurizing Equipment. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 4330-01-350-9387. Verify interchangeability with system specifications before substitution.
Key specifications for 1660-00-461-8979: FSC Application Data: REGULATOR,ACFT ENVIRONMENTAL SYSTEM,B52; General Characteristics Item Description: SILICONE ELASTOMER,ZZ-R-765,CLASS 3,GRADE 60 SEAT MATERIAL,CORROSIONRESISTING STEEL,AMS 5643,CONDITION A,17-4 PH POPPET MATERIAL,8-32 UNC-3ATHREADS ON POPPET END PER MIL-S-7742,1.455 IN. MIN,1.485 IN. MAX L,0.600IN. MIN,0.610 IN. MAX BASE OD,0.115 IN. MIN,0.125 IN. MAX TIP OD,0.248IN. MIN,0.249 IN. MAX MAIN BODY OD IN. 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.
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.