The Valve Assembly,environmental Con, cataloged under National Stock Number 1660-00-520-8441, 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 Honeywell International, Inc Div Aerospace-Tucson. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1660-00-520-8441 |
| Primary Part Number | 135648-1 |
| Item Name | Valve Assembly,environmental Con |
| FSC / FSG | 1660 / 16 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment |
| Manufacturer | Honeywell International, Inc Div Aerospace-Tucson |
| Status | ACTIVE |
| General Characteristics Item Description | ALUMINUM ALLOY; 5.590 IN. OUTSIDE DIAMETER; 3.760 IN. INSIDE DIAMETER; SIX 8-32 THD HOLES ON 4.938 IN. BOLT CIRCLE DIAMETER IN |
| 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 |
|---|---|
| 135648-1 PRIMARY | Honeywell International, Inc Div Aerospace-Tucson (USA) |
| Reference | Meaning |
|---|---|
| 135648-1 | 5/9 Secondary reference Honeywell International Inc. Div Aerospace - Torrance |
| 135648-1 | 5/9 Secondary reference Alliedsignal Inc Dba Allied-Signal Aerospace Co |
NSN 1660-00-520-8441 is a Valve Assembly,environmental Con, manufactured by Honeywell International, Inc Div Aerospace-Tucson, classified under FSC 1660, Aircraft Air Conditioning, Heating, and Pressurizing Equipment. Status: active.
NSN 1660-00-520-8441 has 1 manufacturer part number on file: 135648-1 (Honeywell International, Inc Div Aerospace-Tucson).
Key specifications for 135648-1: General Characteristics Item Description: ALUMINUM ALLOY; 5.590 IN. OUTSIDE DIAMETER; 3.760 IN. INSIDE DIAMETER; SIX 8-32 THD HOLES ON 4.938 IN. BOLT CIRCLE DIAMETER 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 1660-00-520-8441 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.