The Heatsink Assembly,left Side, cataloged under National Stock Number 1270-01-089-2755, is classified within Federal Supply Class 1270 (Aircraft Gunnery Fire Control Components) of the Fire Control Equipment group. The manufacturer of record is Lockheed Martin Corporation. Government technical data includes 2 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1270-01-089-2755 |
| Primary Part Number | 143121 |
| Item Name | Heatsink Assembly,left Side |
| FSC / FSG | 1270 / 12 — Aircraft Gunnery Fire Control Components |
| Manufacturer | Lockheed Martin Corporation |
| Status | ACTIVE |
| FSC Application Data | ACFT GUNNERY FIRE CONTROL COMPONENT |
| General Characteristics Item Description | ITEM IS 14-230 IN. LG,10.250 IN. W;CONSISTS OF 1 HEATSINK,DIPBRAZED;1 COVER,BRAZING SH,AL ALY,CLASS 5 TEMPER F PER MIL-B-20148,0.050 IN. THK;1 FINS FROM FIN STOCK;53 PADS,AL ALY ROUND,6061 TEMP T6,PER QQ-A-225/8,0.437 IN. DIA31 PLATE,AL ALY SH,6061 TEMP T4 PER QQ-A-250/11,0.125 IN. THK;AND 2 STIFFENERS,AL ALY SH,6061 TEMP T4,PER QQ-A-250/11,0.062 IN. THK IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 143121 PRIMARY | Lockheed Martin Corporation (USA) |
| Reference | Meaning |
|---|---|
| 143121 | 5/9 Secondary reference Lockheed Martin Corp Electronics and Missiles Div |
NSN 1270-01-089-2755 is a Heatsink Assembly,left Side, manufactured by Lockheed Martin Corporation, classified under FSC 1270, Aircraft Gunnery Fire Control Components. Status: active.
NSN 1270-01-089-2755 has 1 manufacturer part number on file: 143121 (Lockheed Martin Corporation).
3 possible matches (shared part number, not a government interchangeability claim): 4320-01-198-0825, 3120-01-226-9138, 5945-01-248-0793. Verify interchangeability with system specifications before substitution.
Key specifications for 143121: FSC Application Data: ACFT GUNNERY FIRE CONTROL COMPONENT; General Characteristics Item Description: ITEM IS 14-230 IN. LG,10.250 IN. W;CONSISTS OF 1 HEATSINK,DIPBRAZED;1 COVER,BRAZING SH,AL ALY,CLASS 5 TEMPER F PER MIL-B-20148,0.050 IN. THK;1 FINS FROM FIN STOCK;53 PADS,AL ALY ROUND,6061 TEMP T6,PER QQ-A-225/8,0.437 IN. DIA31 PLATE,AL ALY SH,6061 TEMP T4 PER QQ-A-250/11,0.125 IN. THK;AND 2 STIFFENERS,AL ALY SH,6061 TEMP T4,PER QQ-A-250/11,0.062 IN. THK IN; End Item Identification: AN/AVQ-26,TARGET DESIGNATOR SET-ELECTRO-OPTICAL. 2 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.
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.