The Impeller,fan,centrifugal, cataloged under National Stock Number 4140-01-052-5065, is classified within Federal Supply Class 4140 (Fans, Air Circulators, and Blower Equipment) of the Refrigeration, AC, and Air Circulating Equipment group. The manufacturer of record is Tld Ace Corp Div Tld Ace. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 1 manufacturer part number 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4140-01-052-5065 |
| Primary Part Number | 66538 REVIISION A |
| Item Name | Impeller,fan,centrifugal |
| FSC / FSG | 4140 / 41 — Fans, Air Circulators, and Blower Equipment |
| Manufacturer | Tld Ace Corp Div Tld Ace |
| Status | ACTIVE |
| Material | ALUMINUM OVERALL |
| 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 |
|---|---|
| 66538 REVIISION A PRIMARY | Tld Ace Corp Div Tld Ace (USA) |
| Reference | Meaning |
|---|---|
| 66538 | 5/9 Secondary reference Tld Ace Corp Div Tld Ace |
NSN 4140-01-052-5065 is a Impeller,fan,centrifugal, manufactured by Tld Ace Corp Div Tld Ace, classified under FSC 4140, Fans, Air Circulators, and Blower Equipment. Status: active.
NSN 4140-01-052-5065 has 1 manufacturer part number on file: 66538 REVIISION A (Tld Ace Corp Div Tld Ace).
1 possible match (shared part number, not a government interchangeability claim): 2920-01-219-1885. Verify interchangeability with system specifications before substitution.
Key specifications for 66538 REVIISION A: Material: ALUMINUM OVERALL. 1 specification is 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.