The Hose,air Duct, cataloged under National Stock Number 4720-00-904-9028, is classified within Federal Supply Class 4720 (Hose and Flexible Tubing) of the Pipe, Tubing, Hose, and Fittings group. The manufacturer of record is Textron Aviation Inc. Government technical data includes 9 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4720-00-904-9028 |
| Primary Part Number | 235-1057-139 |
| Item Name | Hose,air Duct |
| FSC / FSG | 4720 / 47 — Hose and Flexible Tubing |
| Manufacturer | Textron Aviation Inc |
| Status | ACTIVE |
| Measuring Method and Length | 36.000 INCHES NOMINAL OVERALL IN |
| Connection Style | ROUND FIRST END |
| Connection Type | SOFT FIRST END |
| Style Designator | HELICALLY WOUND CONTINOUS WIRE SUPPORTED |
| Cross-Sectional Shape Style | ROUND |
| Wall Thickness | 0.156 INCHES NOMINAL IN |
| Inside Diameter | 3.120 INCHES NOMINAL FIRST END IN |
| End Overall Length | 1.500 INCHES NOMINAL FIRST END IN |
| End Inside Diameter | 3.000 INCHES NOMINAL FIRST END IN |
| 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 |
|---|---|
| 235-1057-139 PRIMARY | Textron Aviation Inc (USA) |
| Reference | Meaning |
|---|---|
| 235-1057-139 | 5/9 Secondary reference Shay Industries |
| 235-1057-139 | 3/9 Design control — primary reference Beechcraft Corporation Dba Textron Aviation |
NSN 4720-00-904-9028 is a Hose,air Duct, manufactured by Textron Aviation Inc, classified under FSC 4720, Hose and Flexible Tubing. Status: active.
NSN 4720-00-904-9028 has 1 manufacturer part number on file: 235-1057-139 (Textron Aviation Inc).
Key specifications for 235-1057-139: Measuring Method and Length: 36.000 INCHES NOMINAL OVERALL IN; Connection Style: ROUND FIRST END; Connection Type: SOFT FIRST END; Style Designator: HELICALLY WOUND CONTINOUS WIRE SUPPORTED. 9 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.