The Heat Exchanger,air to Water,airc, cataloged under National Stock Number 1660-01-342-1552, 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 Northrop Grumman Systems Corporation. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1660-01-342-1552 |
| Primary Part Number | 123SCEC5111-3 |
| Item Name | Heat Exchanger,air to Water,airc |
| FSC / FSG | 1660 / 16 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment |
| Manufacturer | Northrop Grumman Systems Corporation |
| Status | ACTIVE |
| Overall Diameter | 19.820 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | N |
| Part Number | Manufacturer |
|---|---|
| 123SCEC5111-3 PRIMARY | Northrop Grumman Systems Corporation (USA) |
| Reference | Meaning |
|---|---|
| 123SCEC5111-3 | 5/9 Secondary reference Northrop Grumman Systems Corporation |
| 187150-3-1 | 5/9 Secondary reference Honeywell International Inc. Div Aerospace - Torrance |
NSN 1660-01-342-1552 is a Heat Exchanger,air to Water,airc, manufactured by Northrop Grumman Systems Corporation, classified under FSC 1660, Aircraft Air Conditioning, Heating, and Pressurizing Equipment. Status: active.
NSN 1660-01-342-1552 has 1 manufacturer part number on file: 123SCEC5111-3 (Northrop Grumman Systems Corporation).
Key specifications for 123SCEC5111-3: Overall Diameter: 19.820 INCHES NOMINAL IN; End Item Identification: ACFT MODEL E-2C. 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 1660-01-342-1552 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.