The Screen,relief Valve, cataloged under National Stock Number 1660-00-520-9599, 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 Intl Inc Defense Avionics Systems. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Item Name | Screen,relief Valve |
| FSC / FSG | 1660 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment (FSG 16) |
| Manufacturers | Honeywell Intl Inc Defense Avionics Systems (CAGE 55972); Drager Safety Ag & Co. Kgaa (CAGE C5810) |
| Parameter | Value |
|---|---|
| NSN | 1660-00-520-9599 |
| Primary Part Number | 814765-1 |
| Item Name | Screen,relief Valve |
| FSC / FSG | 1660 / 16 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment |
| Manufacturer | Honeywell Intl Inc Defense Avionics Systems |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Part Number | Manufacturer |
|---|---|
| 814765-1 PRIMARY | Honeywell Intl Inc Defense Avionics Systems (USA) |
| E20391 | Drager Safety Ag & Co. Kgaa (DEU) |
| Reference | Meaning |
|---|---|
| E20391 | 5/9 Secondary reference B/e Aerospace Systems Gmbh Div Life Support Systems Europe |
| 814765 | 3/2 Design control — primary reference U.S. Government activity |
| 814765-1 | 5/9 Secondary reference Bendix Corp the |
NSN 1660-00-520-9599 is a Screen,relief Valve, manufactured by Honeywell Intl Inc Defense Avionics Systems, classified under FSC 1660, Aircraft Air Conditioning, Heating, and Pressurizing Equipment. Status: active.
NSN 1660-00-520-9599 has 2 manufacturer part numbers on file: 814765-1 (Honeywell Intl Inc Defense Avionics Systems), E20391 (Drager Safety Ag & Co. Kgaa).
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 1660-00-520-9599 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.