The Adapter,air Inlet,heat Exchanger, cataloged under National Stock Number 1660-01-358-4355, is classified within Federal Supply Class 1660 (Aircraft Air Conditioning, Heating, and Pressurizing Equipment) of the Aircraft Components and Accessories group. The manufacturer of record is Meggitt Troy Inc. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 1660-01-358-4355 |
| Primary Part Number | 724251 |
| Item Name | Adapter,air Inlet,heat Exchanger |
| FSC / FSG | 1660 / 16 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment |
| Manufacturer | Meggitt Troy Inc |
| Status | ACTIVE |
| FSC Application Data | COOLER,HYDRAULIC OIL |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 724251 PRIMARY | Meggitt Troy Inc (USA) |
| Reference | Meaning |
|---|---|
| 724251 | 3/9 Design control — primary reference Stewart Warner South Wind Corporation |
NSN 1660-01-358-4355 is a Adapter,air Inlet,heat Exchanger, manufactured by Meggitt Troy Inc, classified under FSC 1660, Aircraft Air Conditioning, Heating, and Pressurizing Equipment. Status: active.
NSN 1660-01-358-4355 has 1 manufacturer part number on file: 724251 (Meggitt Troy Inc).
1 possible match (shared part number, not a government interchangeability claim): 1650-01-469-0504. Verify interchangeability with system specifications before substitution.
Key specifications for 724251: FSC Application Data: COOLER,HYDRAULIC OIL; End Item Identification: CH-53E HELO (COMMON & PECULIAR). 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.
NSN 1660-01-358-4355 has DEMIL Code B. Demilitarization may be required before disposal or transfer to non-military entities.
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.