The Time Reference,atomic Frequency, cataloged under National Stock Number 6645-01-442-1885, is classified within Federal Supply Class 6645 (Time Measuring Instruments) of the Instruments and Laboratory Equipment group. The manufacturer of record is Rockwell Collins, Inc. Dba Collins Aerospace Government Systems Div Collins Aerospace - Government Systems. Government technical data includes 4 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6645-01-442-1885 |
| Primary Part Number | 622-7225-006 |
| Item Name | Time Reference,atomic Frequency |
| FSC / FSG | 6645 / 66 — Time Measuring Instruments |
| Manufacturer | Rockwell Collins, Inc. Dba Collins Aerospace Government Systems Div Collins Aerospace - Government Systems |
| Status | ACTIVE |
| General Characteristics Item Description | POWER: 115.0VAC,47-63 HZ; 65 LBS WT; 10.500 IN . H,19.000IN. W; POWER SUPPLY HEATER; TIMEKEEPING POWER SUPPLY1; CHARGE & CONTROL POWER SUPPLY 1; TIME DISPLAY CCB 1;POWER CONDITIONER ASSEMBLY 1;BACKPLANE 1; TRANSORB CCA 1; ALUMINUM CASE 1; DIFFERENCE IS THE SOFTWARE HAS BEEN UP GRADED AND EVENTUALLY THIS WILL BE THE ONLY ITEM THAT WILL BE PROCURED AND IN THE SYSTEM VAC |
| Criticality Code Justification | CBBL AND NHCFD |
| Features Provided | ELECTROSTATIC SENSITIVE |
| Nuclear Hardness Critical Feature | HARDENED |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL D — Destroy Item |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | M |
| Part Number | Manufacturer |
|---|---|
| 622-7225-006 PRIMARY | Rockwell Collins, Inc. Dba Collins Aerospace Government Systems Div Collins Aerospace - Government Systems (USA) |
| Reference | Meaning |
|---|---|
| O-1849/GRC-228 | 5/1 Secondary reference U.S. Government activity |
NSN 6645-01-442-1885 is a Time Reference,atomic Frequency, manufactured by Rockwell Collins, Inc. Dba Collins Aerospace Government Systems Div Collins Aerospace - Government Systems, classified under FSC 6645, Time Measuring Instruments. Status: active.
NSN 6645-01-442-1885 has 1 manufacturer part number on file: 622-7225-006 (Rockwell Collins, Inc. Dba Collins Aerospace Government Systems Div Collins Aerospace - Government Systems).
Key specifications for 622-7225-006: General Characteristics Item Description: POWER: 115.0VAC,47-63 HZ; 65 LBS WT; 10.500 IN . H,19.000IN. W; POWER SUPPLY HEATER; TIMEKEEPING POWER SUPPLY1; CHARGE & CONTROL POWER SUPPLY 1; TIME DISPLAY CCB 1;POWER CONDITIONER ASSEMBLY 1;BACKPLANE 1; TRANSORB CCA 1; ALUMINUM CASE 1; DIFFERENCE IS THE SOFTWARE HAS BEEN UP GRADED AND EVENTUALLY THIS WILL BE THE ONLY ITEM THAT WILL BE PROCURED AND IN THE SYSTEM VAC; Criticality Code Justification: CBBL AND NHCFD; Features Provided: ELECTROSTATIC SENSITIVE; End Item Identification: MILSTAR. 4 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 6645-01-442-1885 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.