The Heat Exchanger,air to Air,aircra, cataloged under National Stock Number 1660-01-374-8668, 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 Triumph Thermal Systems, Llc. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 1660-01-374-8668 |
| Primary Part Number | UA537577-5 |
| Item Name | Heat Exchanger,air to Air,aircra |
| FSC / FSG | 1660 / 16 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment |
| Manufacturer | Triumph Thermal Systems, Llc |
| Status | ACTIVE |
| FSC Application Data | AIRCRAFT BLEED AIR SYSTEM |
| 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 |
|---|---|
| UA537577-5 PRIMARY | Triumph Thermal Systems, Llc (USA) |
| Reference | Meaning |
|---|---|
| 1810800-107 | 5/2 Secondary reference U.S. Government activity |
| L0500890 | D/9 Drawing number reference only The Boeing Company Div Legacy Am&m |
NSN 1660-01-374-8668 is a Heat Exchanger,air to Air,aircra, manufactured by Triumph Thermal Systems, Llc, classified under FSC 1660, Aircraft Air Conditioning, Heating, and Pressurizing Equipment. Status: active.
NSN 1660-01-374-8668 has 1 manufacturer part number on file: UA537577-5 (Triumph Thermal Systems, Llc).
Key specifications for UA537577-5: FSC Application Data: AIRCRAFT BLEED AIR SYSTEM; Special Features: LOCATION NEAR BLEED AIR INLET AND RAM AIR EXHAUST; MODIFICATION IS TO INSTALL TWO MORE .38 INCH THICK MIN-K COVERS (MINUS CRES FOIL OUTER SHELL) IN; End Item Identification: B-1B AIRCRAFT. 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 1660-01-374-8668 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.