The Synchro Assembly, cataloged under National Stock Number 5990-01-221-4422, is classified within Federal Supply Class 5990 (Synchros and Resolvers) of the Electrical and Electronic Equipment Components group. Government technical data includes 1 specification, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5990-01-221-4422 |
| Item Name | Synchro Assembly |
| FSC / FSG | 5990 / 59 — Synchros and Resolvers |
| Status | ACTIVE |
| General Characteristics Item Description | CONSISTS OF TWO SYNCHROS MOUNTED ON TOP OF BOX HOUSING THAT ENCLOSES GEARING; EACH SYNCHRO HAS A PLUG AND A CABLE WITH A CONNECTOR; TRAIN AXIS UNIT HAS 13 IN. LG CABLE TO ONE SYCHRO AND 7 IN. LG CABLE TO THE OTHER ONE IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL D — Destroy Item |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 636-4134-001 | 3/9 Design control — primary reference Rockwell Collins, Inc. Dba Collins Aerospace Government Systems Div Collins Aerospace - Government Systems |
NSN 5990-01-221-4422 is a Synchro Assembly, classified under FSC 5990, Synchros and Resolvers. Status: active.
Key specifications for 5990-01-221-4422: General Characteristics Item Description: CONSISTS OF TWO SYNCHROS MOUNTED ON TOP OF BOX HOUSING THAT ENCLOSES GEARING; EACH SYNCHRO HAS A PLUG AND A CABLE WITH A CONNECTOR; TRAIN AXIS UNIT HAS 13 IN. LG CABLE TO ONE SYCHRO AND 7 IN. LG CABLE TO THE OTHER ONE IN. 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 5990-01-221-4422 has DEMIL Code D. 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.