The Lamp,flashtube, cataloged under National Stock Number 6240-01-306-1137, is classified within Federal Supply Class 6240 (Electric Lamps) of the Lighting Fixtures and Lamps group. The manufacturer of record is U S Dept of Transportation Federal Aviation Administration. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6240-01-306-1137 |
| Primary Part Number | FT81U |
| Item Name | Lamp,flashtube |
| FSC / FSG | 6240 / 62 — Electric Lamps |
| Manufacturer | U S Dept of Transportation Federal Aviation Administration |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| FT81U PRIMARY | U S Dept of Transportation Federal Aviation Administration (USA) |
| Reference | Meaning |
|---|---|
| 44B0556-3 | 5/9 Secondary reference Siemens Energy & Automation, Inc. Dba Siemens Airfield Solutions Div Siemens Energy & Automation Dba Siemens Airfield Solutions |
| FT81U | 3/9 Design control — primary reference Siemens Energy & Automation, Inc. Dba Siemens Airfield Solutions Div Siemens Energy & Automation Dba Siemens Airfield Solutions |
NSN 6240-01-306-1137 is a Lamp,flashtube, manufactured by U S Dept of Transportation Federal Aviation Administration, classified under FSC 6240, Electric Lamps. Status: active.
NSN 6240-01-306-1137 has 1 manufacturer part number on file: FT81U (U S Dept of Transportation Federal Aviation Administration).
Key specifications for FT81U: Special Features: FUNCTION: H V FLASHING LAMP ASSY; REFERENCE DATA: 3A1A1M TU-6850.54, FA 9987, MALSR, HV REIL & REIL FLASHING LIGHT SYSTEMS, SEC 1-10, PG 8-38; End Item Identification: SFLIII, FA9987, REIL FLASHTUBE. 0 specifications are documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). Hazard information on this page is shown exactly as it appears in the DLA record.
NSN 6240-01-306-1137 has DEMIL Code B. 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.