The Duct Assembly,air Conditioning-H, cataloged under National Stock Number 1660-01-040-6983, 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 Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems. Government technical data includes 3 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 1660-01-040-6983 |
| Primary Part Number | 18-54438-1 |
| Item Name | Duct Assembly,air Conditioning-H |
| FSC / FSG | 1660 / 16 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment |
| Manufacturer | Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems |
| Status | ACTIVE |
| Material Thickness | 0.028 INCHES NOMINAL IN |
| Material | STEEL COMP 321 |
| Aircraft Mission Design Series | F-5F |
| 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 |
|---|---|
| 18-54438-1 PRIMARY | Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems (USA) |
| 18-54438-1 | Northrop Grumman Systems Corporation (USA) |
| Reference | Meaning |
|---|---|
| 18-54438-1 | 5/9 Secondary reference Northrop Grumman Technical Services, Inc. Dba Defense Systems Sector |
NSN 1660-01-040-6983 is a Duct Assembly,air Conditioning-H, manufactured by Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems, classified under FSC 1660, Aircraft Air Conditioning, Heating, and Pressurizing Equipment. Status: active.
NSN 1660-01-040-6983 has 2 manufacturer part numbers on file: 18-54438-1 (Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems), 18-54438-1 (Northrop Grumman Systems Corporation).
Key specifications for 18-54438-1: Overall Length: 1.400 INCHES NOMINAL IN; Material Thickness: 0.028 INCHES NOMINAL IN; Special Features: 2.000 IN. OD; CONSIST OF P/N 18-54438-3,TUBE; P/N 24538-200,FLANGE IN; End Item Identification: F-5F AIRCRAFT. 3 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.
NSN 1660-01-040-6983 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.