The Muffler,exhaust, cataloged under National Stock Number 2990-00-684-3347, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. The manufacturer of record is Textron Aviation Inc. Government technical data includes 22 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 2990-00-684-3347 |
| Primary Part Number | 330-2030 |
| Item Name | Muffler,exhaust |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Manufacturer | Textron Aviation Inc |
| Status | ACTIVE |
| Operating Position | VERTICAL |
| Inlet Outside Diameter | 3.125 INCHES NOMINAL FIRST INLET IN |
| Inlet Outside Diameter | 3.125 INCHES NOMINAL SECOND INLET IN |
| Inlet Location | 3-1/4 IN. C TO C FROM HORIZONTAL CENTER LINE IN |
| Design Type | JACKETED |
| Outlet Inside Diameter | 3.310 INCHES NOMINAL FIRST OUTLET IN |
| Inlet Projection Length | 1.000 INCHES NOMINAL FIRST INLET IN |
| Inlet Projection Length | 1.000 INCHES NOMINAL SECOND INLET IN |
| Material Document and Classification | MIL-S-6721, COMP TI 321 MIL SPEC SINGLE MATERIAL RESPONSE LOCATION NOT OTHERWISE SPECIFIED |
| Muffler Design | LOUVER |
| Outlet Outside Diameter | 3.390 INCHES NOMINAL FIRST OUTLET IN |
| Tube Quantity | 3 |
| Inlet Connection Type | UNTHREADED FIRST INLET |
| Inlet Connection Type | UNTHREADED SECOND INLET |
| Body Shape | OVAL |
| Inlet Inside Diameter | 3.000 INCHES NOMINAL FIRST INLET IN |
| Inlet Inside Diameter | 3.000 INCHES NOMINAL SECOND INLET IN |
| Material | STEEL COMP 321 LOCATION NOT OTHERWISE SPECIFIED |
| Material | GLASS FIBER INSULATION |
| Outlet Projection Length | 1.000 INCHES NOMINAL FIRST OUTLET IN |
| Outlet Connection Type | UNTHREADED FIRST OUTLET |
| Outlet Location | CENTRALLY LOCATED IN END SECTION OF BODY |
| 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 |
|---|---|
| 330-2030 PRIMARY | Textron Aviation Inc (USA) |
| Reference | Meaning |
|---|---|
| 330-2030 | 3/9 Design control — primary reference Beechcraft Corporation Dba Textron Aviation |
| 330-2030 | 5/2 Secondary reference U.S. Government activity |
NSN 2990-00-684-3347 is a Muffler,exhaust, manufactured by Textron Aviation Inc, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
NSN 2990-00-684-3347 has 1 manufacturer part number on file: 330-2030 (Textron Aviation Inc).
Key specifications for 330-2030: Operating Position: VERTICAL; Overall Height: 6.000 INCHES NOMINAL IN; Inlet Outside Diameter: 3.125 INCHES NOMINAL FIRST INLET IN; Inlet Outside Diameter: 3.125 INCHES NOMINAL SECOND INLET IN. 22 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.