The Sensor,mass Air Flow, cataloged under National Stock Number 2990-01-550-5555, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. The manufacturer of record is Deere & Co. The record lists 3 manufacturer part numbers 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 2990-01-550-5555 |
| Primary Part Number | AT221135 |
| Item Name | Sensor,mass Air Flow |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Manufacturer | Deere & Co |
| Status | ACTIVE |
| 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 |
|---|---|
| AT221135 PRIMARY | Deere & Co (USA) |
| AT221135 | Rdo Equipment Rdo Equipment Pty Ltd (AUS) |
| AT221135 | Rdo Equipment Pty Ltd (AUS) |
| Reference | Meaning |
|---|---|
| AT221135 | 5/9 Secondary reference Hitachi Construction Machinery Aust Australia Pty Ltd Hitachi Construction Machinery |
| AT221135 | 5/9 Secondary reference Rdo Equipment Pty Ltd |
NSN 2990-01-550-5555 is a Sensor,mass Air Flow, manufactured by Deere & Co, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
NSN 2990-01-550-5555 has 3 manufacturer part numbers on file: AT221135 (Deere & Co), AT221135 (Rdo Equipment Rdo Equipment Pty Ltd), AT221135 (Rdo Equipment Pty Ltd).
Key specifications for AT221135: Special Features: INCLUDES BOOT; End Item Identification: LOADER, MODEL LX100-3 AND LX100-5. 0 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.