The Duct Assembly,air Conditioning-H, cataloged under National Stock Number 1660-01-021-3995, 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 Rsa Engineered Products, Llc Dba Rsa Engineered Products Llc. The record lists 3 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1660-01-021-3995 |
| Primary Part Number | 27A403-1000 |
| Item Name | Duct Assembly,air Conditioning-H |
| FSC / FSG | 1660 / 16 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment |
| Manufacturer | Rsa Engineered Products, Llc Dba Rsa Engineered Products Llc |
| Status | ACTIVE |
| 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 |
|---|---|
| FA1036-1000 | Hydraflow (USA) |
| IT4570-010 | Industrial Tube Co Llc Dba Industrial Tube Co Llc Div Industrial Tube Company, Llc (USA) |
| 27A403-1000 PRIMARY | Rsa Engineered Products, Llc Dba Rsa Engineered Products Llc (USA) |
| Reference | Meaning |
|---|---|
| 331101-5 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
NSN 1660-01-021-3995 is a Duct Assembly,air Conditioning-H, manufactured by Rsa Engineered Products, Llc Dba Rsa Engineered Products Llc, classified under FSC 1660, Aircraft Air Conditioning, Heating, and Pressurizing Equipment. Status: active.
NSN 1660-01-021-3995 has 3 manufacturer part numbers on file: FA1036-1000 (Hydraflow), IT4570-010 (Industrial Tube Co Llc Dba Industrial Tube Co Llc Div Industrial Tube Company, Llc), 27A403-1000 (Rsa Engineered Products, Llc Dba Rsa Engineered Products Llc).
1 possible match (shared part number, not a government interchangeability claim): 4030-01-676-1485. Verify interchangeability with system specifications before substitution.
Key specifications for 27A403-1000: End Item Identification: ACFT,MODEL C130. 0 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.