The Valve Assembly Relief,cylinder,b, cataloged under National Stock Number 1620-01-040-6929, is classified within Federal Supply Class 1620 (Aircraft Landing Gear Components) of the Aircraft Components and Accessories group. The manufacturer of record is Derosa Engineering, Inc. Dba Derosa Engineering Inc. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 6 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1620-01-040-6929 |
| Primary Part Number | 4G14577-101A |
| Item Name | Valve Assembly Relief,cylinder,b |
| FSC / FSG | 1620 / 16 — Aircraft Landing Gear Components |
| Manufacturer | Derosa Engineering, Inc. Dba Derosa Engineering Inc |
| Status | ACTIVE |
| General Characteristics Item Description | VALVE BODY 1 P/N 4G14578-101A,INSERT 1 P/N 4G14579-101A,POPPET 1 P/N 4G14580-101A,WASHER 2 P/N 4G14581-101A,SPRING 1 P/N 4G14584-101A,ROLLER 1P/N Q8116,FILTER 1 P/N 25028 A |
| 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 |
|---|---|
| 4G14577-101A | Derosa Engineering, Inc. Dba Derosa Engineering Inc (USA) |
| 4G14577-101A | Special Projects Mfg Co Inc (USA) |
| 4G14577-101A | Hdi Landing Gear Usa Inc (USA) |
| 4G14577-101A | Goodrich Corporation (USA) |
| 4G14577-101A | Tactair Fluid Controls Inc (USA) |
| 4G14577-101A | Heroux-Devtek Inc (CAN) |
| Reference | Meaning |
|---|---|
| 4G14577-101A | 5/9 Secondary reference Eagle Tool & Machine Co., Inc. |
| 4G14577-101A | 5/2 Secondary reference U.S. Government activity |
| 4G14577-101A | 5/9 Secondary reference Goodrich Corporation Div Advanced Structures Landing Systems |
| 4G14577-101A | 3/2 Design control — primary reference U.S. Government activity |
| 4G14577-101A | 5/9 Secondary reference Honeywell International Inc. Dba Honeywell Div Aerospace-South Bend (westmoor St) |
NSN 1620-01-040-6929 is a Valve Assembly Relief,cylinder,b, manufactured by Derosa Engineering, Inc. Dba Derosa Engineering Inc, classified under FSC 1620, Aircraft Landing Gear Components. Status: active.
NSN 1620-01-040-6929 has 6 manufacturer part numbers on file: 4G14577-101A (Derosa Engineering, Inc. Dba Derosa Engineering Inc), 4G14577-101A (Special Projects Mfg Co Inc), 4G14577-101A (Hdi Landing Gear Usa Inc), 4G14577-101A (Goodrich Corporation), 4G14577-101A (Tactair Fluid Controls Inc) and 1 more.
Key specifications for 4G14577-101A: General Characteristics Item Description: VALVE BODY 1 P/N 4G14578-101A,INSERT 1 P/N 4G14579-101A,POPPET 1 P/N 4G14580-101A,WASHER 2 P/N 4G14581-101A,SPRING 1 P/N 4G14584-101A,ROLLER 1P/N Q8116,FILTER 1 P/N 25028 A; End Item Identification: ACFT C5A PO MASTER CY P/N 4G14572-101A MAIN LANDING GEAR A. 1 specification is 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 1620-01-040-6929 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.