The Generator,tachometer, cataloged under National Stock Number 6680-00-522-6397, is classified within Federal Supply Class 6680 (Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments) of the Instruments and Laboratory Equipment group. The manufacturer of record is Combat Capabilities Development Command (ccdc) Armaments Center Dba Ccdc Div Logistics Research and Engineering Directorate. Government technical data includes 12 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6680-00-522-6397 |
| Primary Part Number | 139C7804 |
| Item Name | Generator,tachometer |
| FSC / FSG | 6680 / 66 — Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments |
| Manufacturer | Combat Capabilities Development Command (ccdc) Armaments Center Dba Ccdc Div Logistics Research and Engineering Directorate |
| Status | ACTIVE |
| Mounting Facility Type and Quantity | 1 CLAMP COLLAR |
| Electrical Resistance | 300.0 OHMS |
| Calibration Speed in RPM | 1000.0 |
| Mounting Method | CLAMP RING(S) |
| Accuracy Range in Percent | -0.05 TO 0.05 |
| Features Provided | HORIZONTAL MOUNTING POSITION AND VERTICAL MOUNTING POSITION |
| Specific Use | AH-1 HELICOPTER |
| Calibration Voltage Output Type in Volts | 7.0 DC |
| Length of Shaft From Housing | UNABLE TO DECODE |
| Excitor Type | SELF-EXCITED |
| Terminal Type and Quantity | 1 CONNECTOR, PLUG |
| Rotor Speed Rating in RPM | 15000.0 SINGLE FULL LOAD |
| 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 |
NSN 6680-00-522-6397 is a Generator,tachometer, manufactured by Combat Capabilities Development Command (ccdc) Armaments Center Dba Ccdc Div Logistics Research and Engineering Directorate, classified under FSC 6680, Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments. Status: active.
NSN 6680-00-522-6397 has 2 manufacturer part numbers on file: 139C7804 (General Dynamics-Ots, Inc. Div Ordnance and Tactical Systems), 139C7804 (Combat Capabilities Development Command (ccdc) Armaments Center Dba Ccdc Div Logistics Research and Engineering Directorate).
Key specifications for 139C7804: Mounting Facility Type and Quantity: 1 CLAMP COLLAR; Electrical Resistance: 300.0 OHMS; Overall Length: 2.358 INCHES IN; Calibration Speed in RPM: 1000.0. 12 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 6680-00-522-6397 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.