The Muffler,exhaust-Intake, cataloged under National Stock Number 2990-01-361-2496, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. The manufacturer of record is Donaldson Company, Inc.. Government technical data includes 21 specifications, cited from the U.S. Government catalog. The record lists 2 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2990-01-361-2496 |
| Primary Part Number | FMM10-0528 |
| Item Name | Muffler,exhaust-Intake |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Manufacturer | Donaldson Company, Inc. |
| Status | ACTIVE |
| Operating Position | HORIZONTAL |
| Inlet Outside Diameter | 4.062 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN |
| Outlet Connection Quantity | 1 |
| Inlet Location | ON BOTTOM OF MUFFLER 4.500 FROM CENTER OF INLET TO END |
| Coolant Type | AIR |
| Design Type | DRY |
| Overall Diameter | 10.078 INCHES NOMINAL IN |
| Inlet Connection Quantity | 1 |
| Outlet Inside Diameter | 4.016 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN |
| Inlet Projection Length | 2.960 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN |
| Muffler Design | MULTIPASS W/INTEGRAL SPARK ARRESTOR |
| Outlet Outside Diameter | 4.062 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN |
| Outlet Flange Shape | ROUND LOCATION NOT OTHERWISE SPECIFIED |
| Inlet Connection Type | UNTHREADED LOCATION NOT OTHERWISE SPECIFIED |
| Body Shape | ROUND |
| Surface Treatment | ALUMINUM ALLOY |
| Inlet Inside Diameter | 4.016 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN |
| Material | STEEL |
| Outlet Projection Length | 3.500 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN |
| Outlet Connection Type | UNTHREADED LOCATION NOT OTHERWISE SPECIFIED |
| Outlet Location | CENTRALLY LOCATED ON HORIZONAL END |
| 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 |
|---|---|
| FMM10-0528 PRIMARY | Donaldson Company, Inc. (USA) |
| 1771AS307-1 | Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier (USA) |
| Reference | Meaning |
|---|---|
| 1771AS307 | D/9 Drawing number reference only Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier |
NSN 2990-01-361-2496 is a Muffler,exhaust-Intake, manufactured by Donaldson Company, Inc., classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
NSN 2990-01-361-2496 has 2 manufacturer part numbers on file: FMM10-0528 (Donaldson Company, Inc.), 1771AS307-1 (Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier).
Key specifications for FMM10-0528: Operating Position: HORIZONTAL; Inlet Outside Diameter: 4.062 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN; Outlet Connection Quantity: 1; Inlet Location: ON BOTTOM OF MUFFLER 4.500 FROM CENTER OF INLET TO END. 21 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.