The Heater,air Duct,engine, cataloged under National Stock Number 2990-00-528-6747, 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15 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2990-00-528-6747 |
| Item Name | Heater,air Duct,engine |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Status | ACTIVE |
| Integral Fuel Tank | NOT INCLUDED |
| Air Duct Connection Quantity | 3 |
| FSC Application Data | HEATER,ENGINE ACCESSORY NONAIRCRAFT |
| Burner Fuel Feed Method | PRESSURE |
| Voltage in Volts and Current Type | 24.0 DC |
| Angle Connection Type | STATIONARY |
| Outside Diameter | 2.500 INCHES NOMINAL IN |
| Fuel Type | GASOLINE |
| Automatic Temp Control | INCLUDED |
| Air Duct Connection Thread Provision | NOT INCLUDED |
| Mounted Heater Switch | NOT INCLUDED |
| Pump | NOT INCLUDED |
| Air Duct Connection Design | STRAIGHT AND ANGLED |
| Heat Delivery Rate in Btu Per Hour | 85000.000 |
| Furnished Items and Quantity | 1 ELECTRIC MOTOR W/BLOWER |
| 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 |
|---|---|
| A86000 | 5/2 Secondary reference U.S. Government activity |
| A86999 | 5/9 Secondary reference U.S. Government activity |
| 1-86000 | 3/2 Design control — primary reference U.S. Government activity |
NSN 2990-00-528-6747 is a Heater,air Duct,engine, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 4520-01-618-1821. Verify interchangeability with system specifications before substitution.
Key specifications for 2990-00-528-6747: Integral Fuel Tank: NOT INCLUDED; Air Duct Connection Quantity: 3; FSC Application Data: HEATER,ENGINE ACCESSORY NONAIRCRAFT; Burner Fuel Feed Method: PRESSURE. 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.