The Generator,tachometer, cataloged under National Stock Number 6680-00-445-1246, 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 Aircraft Appliances and Equipment Limited Div Aircraft Appliances and Equipment Ltd.. Government technical data includes 6 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6680-00-445-1246 |
| Primary Part Number | TG255-002 |
| Item Name | Generator,tachometer |
| FSC / FSG | 6680 / 66 — Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments |
| Manufacturer | Aircraft Appliances and Equipment Limited Div Aircraft Appliances and Equipment Ltd. |
| Status | ACTIVE |
| Mounting Facility Type and Quantity | 4 UNTHREADED HOLE(S) |
| Current Type | UNABLE TO DECODE |
| Mounting Method | FLANGE |
| Nominal Center to Center Distance Between Mounting Facilities Parallel to Length | 1.861 INCHES IN |
| Nominal Center to Center Distance Between Mounting Facilities Parallel to Width | 1.861 INCHES IN |
| Length of Shaft From Housing | UNABLE TO DECODE |
| 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 |
|---|---|
| TG255-002 | Aircraft Appliances and Equipment Limited Div Aircraft Appliances and Equipment Ltd. (CAN) |
| Reference | Meaning |
|---|---|
| 332C218P2 | 7/2 Vendor item drawing reference General Electric Company |
| TG255-002 | 3/9 Design control — primary reference Advance Power /energx/ Inc |
| 2CM9AAH-4 | 5/9 Secondary reference General Electric Co Aircraft Instruments Dept Electro Chemical Energy Conversion Programs |
| 2CM9AAH-4 | 3/2 Design control — primary reference U.S. Government activity |
NSN 6680-00-445-1246 is a Generator,tachometer, manufactured by Aircraft Appliances and Equipment Limited Div Aircraft Appliances and Equipment Ltd., classified under FSC 6680, Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments. Status: active.
NSN 6680-00-445-1246 has 1 manufacturer part number on file: TG255-002 (Aircraft Appliances and Equipment Limited Div Aircraft Appliances and Equipment Ltd.).
1 possible match (shared part number, not a government interchangeability claim): 6680-00-553-8892. Verify interchangeability with system specifications before substitution.
Key specifications for TG255-002: Mounting Facility Type and Quantity: 4 UNTHREADED HOLE(S); Current Type: UNABLE TO DECODE; Overall Length: 4.095 INCHES IN; Mounting Method: FLANGE. 6 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 6680-00-445-1246 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.