The Spool,reservoir, cataloged under National Stock Number 1660-00-321-5750, 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 2 specifications, 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1660-00-321-5750 |
| Primary Part Number | U535603 |
| Item Name | Spool,reservoir |
| FSC / FSG | 1660 / 16 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment |
| Manufacturer | Triumph Thermal Systems, Llc |
| Status | ACTIVE |
| FSC Application Data | F15 ACFT |
| General Characteristics Item Description | STEEL,CORROSION RESISTING QQ-S-764 CLASS 303MA,PASSIVATEDPS363 UNITED AIRCRAFT PRODUCTS INC,0.277 IN. MIN 0.279 IN. MAXOD,0.490 IN. MIN 0.510 IN.MAX LG O/A,0.089 IN. MIN 0.099 IN.MAX ID IN |
| 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 |
|---|---|
| U535603 PRIMARY | Triumph Thermal Systems, Llc (USA) |
NSN 1660-00-321-5750 is a Spool,reservoir, manufactured by Triumph Thermal Systems, Llc, classified under FSC 1660, Aircraft Air Conditioning, Heating, and Pressurizing Equipment. Status: active.
NSN 1660-00-321-5750 has 1 manufacturer part number on file: U535603 (Triumph Thermal Systems, Llc).
Key specifications for U535603: FSC Application Data: F15 ACFT; General Characteristics Item Description: STEEL,CORROSION RESISTING QQ-S-764 CLASS 303MA,PASSIVATEDPS363 UNITED AIRCRAFT PRODUCTS INC,0.277 IN. MIN 0.279 IN. MAXOD,0.490 IN. MIN 0.510 IN.MAX LG O/A,0.089 IN. MIN 0.099 IN.MAX ID IN; End Item Identification: RESERVOIR ASSEMBLY US534121-7. 2 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 1660-00-321-5750 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.