The Exhaust System,engine, cataloged under National Stock Number 2990-01-325-1868, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. The manufacturer of record is Drs Environmental Systems Inc. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2990-01-325-1868 |
| Primary Part Number | 77000-100 |
| Item Name | Exhaust System,engine |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Manufacturer | Drs Environmental Systems Inc |
| 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 |
|---|---|
| 77000-100 | Drs Environmental Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| 77000-100 | 5/9 Secondary reference U.S. Government activity |
| 83-14541A | 5/9 Secondary reference U.S. Government activity |
| 83-14541A | 5/9 Secondary reference Bae Systems Controls Inc. |
| 83-14541 | 5/9 Secondary reference Bae Systems Controls Inc. |
| 1024818 | 3/2 Design control — primary reference U.S. Government activity |
| 77000 | 5/9 Secondary reference U.S. Government activity |
| 83-14541A | 5/9 Secondary reference U.S. Government activity |
NSN 2990-01-325-1868 is a Exhaust System,engine, manufactured by Drs Environmental Systems Inc, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
NSN 2990-01-325-1868 has 1 manufacturer part number on file: 77000-100 (Drs Environmental Systems Inc).
3 possible matches (shared part number, not a government interchangeability claim): 5305-01-508-4536, 3950-01-634-0111, 6710-01-668-5402. Verify interchangeability with system specifications before substitution.
Key specifications for 77000-100: End Item Identification: 1730-01-144-1897 POWER UNIT AIRCRAFT. 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.