The Duct Assembly,air Conditioning-H, cataloged under National Stock Number 1660-01-351-3898, 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 Welding Metallurgy, Inc.. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 1660-01-351-3898 |
| Primary Part Number | 123EC10164-509 |
| Item Name | Duct Assembly,air Conditioning-H |
| FSC / FSG | 1660 / 16 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment |
| Manufacturer | Welding Metallurgy, Inc. |
| Status | ACTIVE |
| Aircraft Mission Design Series | E-2C |
| 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 |
|---|---|
| 123EC10164-509 PRIMARY | Welding Metallurgy, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 123EC10164-509 | 5/9 Secondary reference Northrop Grumman Systems Corporation |
| 123EC10164-509 | C/1 Advisory reference — outside the item-of-supply concept Northrop Grumman Systems Corporation |
NSN 1660-01-351-3898 is a Duct Assembly,air Conditioning-H, manufactured by Welding Metallurgy, Inc., classified under FSC 1660, Aircraft Air Conditioning, Heating, and Pressurizing Equipment. Status: active.
NSN 1660-01-351-3898 has 1 manufacturer part number on file: 123EC10164-509 (Welding Metallurgy, Inc.).
Key specifications for 123EC10164-509: End Item Identification: E-2C AIRCRAFT; Aircraft Mission Design Series: E-2C. 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 1660-01-351-3898 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.