The Muffler,intake, cataloged under National Stock Number 2990-01-057-3475, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. Government technical data includes 7 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2990-01-057-3475 |
| Item Name | Muffler,intake |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Status | ACTIVE |
| Operating Position | HORIZONTAL |
| Overall Diameter | 8.000 INCHES NOMINAL IN |
| Material Document and Classification | QQ-A-250/8 FED SPEC 1ST MATERIAL RESPONSE AND RR-W-370 FED SPEC 2ND MATERIAL RESPONSE OR QQ-A-250/11 FED SPEC 1ST MATERIAL RESPONSE AND RR-W-370 FED SPEC 2ND MATERIAL RESPONSE LOCATION NOT OTHERWISE SPECIFIED |
| Muffler Design | STRAIGHT THROUGH |
| Body Shape | ROUND |
| Surface Treatment | ALUMINUM AND PLASTIC POLYURETHANE |
| Material | ALUMINUM ALLOY 5052 AND STEEL,CARBON |
| 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 |
|---|---|
| C5-19-6627 | 3/2 Design control — primary reference U.S. Government activity |
NSN 2990-01-057-3475 is a Muffler,intake, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
Key specifications for 2990-01-057-3475: Operating Position: HORIZONTAL; Overall Diameter: 8.000 INCHES NOMINAL IN; Material Document and Classification: QQ-A-250/8 FED SPEC 1ST MATERIAL RESPONSE AND RR-W-370 FED SPEC 2ND MATERIAL RESPONSE OR QQ-A-250/11 FED SPEC 1ST MATERIAL RESPONSE AND RR-W-370 FED SPEC 2ND MATERIAL RESPONSE LOCATION NOT OTHERWISE SPECIFIED; Overall Length: 9.000 INCHES NOMINAL IN. 7 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.