The Heat Exchanger,fluid to Fluid,ai, cataloged under National Stock Number 1660-01-696-4861, 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 Pacific Design Technologies, Inc. Dba Pacific Design Technologies. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Item Name | Heat Exchanger,fluid to Fluid,ai |
| FSC / FSG | 1660 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment (FSG 16) |
| Manufacturers | Pacific Design Technologies, Inc. Dba Pacific Design Technologies (CAGE 1P7T0); Gulfstream Aerospace Corporation Div Government Contracts (CAGE 59734) |
| Parameter | Value |
|---|---|
| NSN | 1660-01-696-4861 |
| Primary Part Number | 5187 |
| Item Name | Heat Exchanger,fluid to Fluid,ai |
| FSC / FSG | 1660 / 16 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment |
| Manufacturer | Pacific Design Technologies, Inc. Dba Pacific Design Technologies |
| 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 |
NSN 1660-01-696-4861 is a Heat Exchanger,fluid to Fluid,ai, manufactured by Pacific Design Technologies, Inc. Dba Pacific Design Technologies, classified under FSC 1660, Aircraft Air Conditioning, Heating, and Pressurizing Equipment. Status: active.
NSN 1660-01-696-4861 has 2 manufacturer part numbers on file: 5187 (Pacific Design Technologies, Inc. Dba Pacific Design Technologies), 5187 (Gulfstream Aerospace Corporation Div Government Contracts).
1 possible match (shared part number, not a government interchangeability claim): 5920-01-719-7354. Verify interchangeability with system specifications before substitution.
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.