The Heat Exchanger,air to Air,aircra, cataloged under National Stock Number 1660-01-253-9510, 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 Ontic Engineering & Manufacturing, Inc Dba Ontic Us. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1660-01-253-9510 |
| Primary Part Number | 78D52-3 |
| Item Name | Heat Exchanger,air to Air,aircra |
| FSC / FSG | 1660 / 16 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment |
| Manufacturer | Ontic Engineering & Manufacturing, Inc Dba Ontic Us |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 78D52-3 PRIMARY | Ontic Engineering & Manufacturing, Inc Dba Ontic Us (USA) |
| 123SCEC5150-5 PRIMARY | Northrop Grumman Systems Corporation (USA) |
| 123SCEC5150-5 | Northrop Grumman Systems Corporation (USA) |
| Reference | Meaning |
|---|---|
| 78D52-1 | 5/9 Secondary reference Grimes Aerospace Company |
| 78D52-3 | 3/9 Design control — primary reference Grimes Aerospace Company |
| 8951378D52 | 5/9 Secondary reference Grimes Aerospace Company |
| 78D52-3 | 5/9 Secondary reference Honeywell International Inc. Dba Honeywell International |
NSN 1660-01-253-9510 is a Heat Exchanger,air to Air,aircra, manufactured by Ontic Engineering & Manufacturing, Inc Dba Ontic Us, classified under FSC 1660, Aircraft Air Conditioning, Heating, and Pressurizing Equipment. Status: active.
NSN 1660-01-253-9510 has 3 manufacturer part numbers on file: 78D52-3 (Ontic Engineering & Manufacturing, Inc Dba Ontic Us), 123SCEC5150-5 (Northrop Grumman Systems Corporation), 123SCEC5150-5 (Northrop Grumman Systems Corporation).
Key specifications for 78D52-3: End Item Identification: ACFT E-2C. 0 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.
NSN 1660-01-253-9510 has DEMIL Code Q. 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.