The Duct Assembly,air Conditioning-H, cataloged under National Stock Number 1660-01-280-7088, 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 Northrop Grumman Systems Corporation. Government technical data includes 4 specifications, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1660-01-280-7088 |
| Primary Part Number | 123EC51251-1 |
| Item Name | Duct Assembly,air Conditioning-H |
| FSC / FSG | 1660 / 16 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment |
| Manufacturer | Northrop Grumman Systems Corporation |
| Status | ACTIVE |
| Surface Treatment Document and Classification | MIL-C-5541 CL1A MIL SPEC SINGLE TREATMENT RESPONSE |
| Material Document and Classification | WW-T-700/4 FED SPEC SINGLE MATERIAL RESPONSE |
| Surface Treatment | CHROMATE |
| Material | ALUMINUM ALLOY 5052 |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 123EC51251-1 PRIMARY | Northrop Grumman Systems Corporation (USA) |
| Reference | Meaning |
|---|---|
| 123EC51251-1 | 5/9 Secondary reference Northrop Grumman Systems Corporation |
NSN 1660-01-280-7088 is a Duct Assembly,air Conditioning-H, manufactured by Northrop Grumman Systems Corporation, classified under FSC 1660, Aircraft Air Conditioning, Heating, and Pressurizing Equipment. Status: active.
NSN 1660-01-280-7088 has 1 manufacturer part number on file: 123EC51251-1 (Northrop Grumman Systems Corporation).
Key specifications for 123EC51251-1: Surface Treatment Document and Classification: MIL-C-5541 CL1A MIL SPEC SINGLE TREATMENT RESPONSE; Material Document and Classification: WW-T-700/4 FED SPEC SINGLE MATERIAL RESPONSE; Overall Length: 22.100 INCHES NOMINAL IN; Special Features: 2.500 IN. DIA.; 0.028 IN. WALL THICKNESS; INSULATION 3.000 IN. DIA.; 0.250 IN. THICK IN. 4 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.