The Muffler,exhaust, cataloged under National Stock Number 2990-00-329-3909, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. Government technical data includes 15 specifications, cited from the U.S. Government catalog. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2990-00-329-3909 |
| Item Name | Muffler,exhaust |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Status | ACTIVE |
| Inlet Flange Shape | ROUND SINGLE INLET |
| Inlet Location | IN END SECTION OF BODY |
| Coolant Type | AIR |
| Design Type | DRY |
| Overall Diameter | 5.500 INCHES NOMINAL IN |
| Outlet Inside Diameter | 5.750 INCHES NOMINAL FIRST OUTLET IN |
| Inlet Flange Mounting Hole Diameter | 0.196 INCHES NOMINAL SINGLE INLET IN |
| Muffler Design | STRAIGHT THROUGH |
| Outlet Outside Diameter | 5.844 INCHES NOMINAL FIRST OUTLET IN |
| Inlet Connection Type | FLANGE SINGLE INLET |
| Body Shape | ROUND |
| Inlet Flange Mounting Provision and Quantity | 6 HOLES SINGLE INLET |
| Material | STEEL CORROSION RESISTING LOCATION NOT OTHERWISE SPECIFIED |
| Outlet Connection Type | UNTHREADED FIRST OUTLET |
| Outlet Location | 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 |
| Reference | Meaning |
|---|---|
| 64D24722 | 5/9 Secondary reference Partsco Inc Labco Div |
| 64D24722 | 5/9 Secondary reference U.S. Government activity |
| 7839438 | 3/9 Design control — primary reference U.S. Government activity |
| 64D24722 | 5/9 Secondary reference U.S. Government activity |
| 64D24722 | 5/9 Secondary reference Harco Manufacturing Company Div Harco Manufacturing Company Inc |
| 64D24722 | 5/9 Secondary reference U.S. Government activity |
| 64D24722 | 5/9 Secondary reference Mueller E R Tool and Mfg Co Inc |
| 235-0077 | 5/9 Secondary reference Beechcraft Corporation Dba Textron Aviation |
NSN 2990-00-329-3909 is a Muffler,exhaust, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
Key specifications for 2990-00-329-3909: Inlet Flange Shape: ROUND SINGLE INLET; Inlet Location: IN END SECTION OF BODY; Coolant Type: AIR; Design Type: DRY. 15 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.