ROYCO LGF and SSF are mineral oil based hydraulic fluids designed specifically for use in aircraft landing gear systems shock struts and other fluid dampening systems.
Modern additive technology for greatly im- proved lubricity and extreme pressure anti-wear performance is used to provide the performance levels required by today’s wide body aircraft.
Applications:
ROYCO SSF and ROYCO LGF were specifically developed to improve “slip stiction” and to alleviate “ladder cracking” in landing gear struts due to sudden and severe shock loads encountered in these aircraft during landing.
ROYCO LGF and SSF are approved for use in most current models of Boeing, Lockheed, McDonnell Douglas, Airbus, and many other manufacturers of commercial transports.
Composition:ROYCO LGF consists of hydraulic fluid conforming to MIL-H-5606 plus LUBRIZOL 1395 and other additives to improve landing gear performance.
ROYCO SSF is a preservative grade of hydraulic fluid conforming to MIL-PRF-6083 plus LUBRIZOL 1395 and other additives.
Approvals:
ROYCO SSF and LGF are qualified to Boeing Materials Specification BMS 3-32 (Type I and II respectively). They also conform to Douglas Specification DPM-6177.
Documentation supporting other transport manufacturers’ specification may be obtained upon request.
| PROPERTIES | ROYCO SSF | ROYCO LGF |
| Kinematic Viscosity, cSt | | |
| @ 40°C | 14.5 | 14.5 |
| @-40°C | 560 | 423 |
| @-54°C | 2640 | 1780 |
| Flash Point, °C | 108 | 110 |
| Total Acid Number, mg KOH/g | 2.6 | 2.4 |
| Specific Gravity, 15.6°C, g/cc | 0.882 | 0.874 |
| API Gravity | 28.9 | 20.5 |
| 4-Ball Wear, scar diameter, mm2 | 0.43 | 0.43 |
