Mobil HyJet™ IV-A Plus is a fire-resistant phosphate ester hydraulic fluid for commercial aircraft. A low-density SAE AS1241 Type IV fluid, it offers high-temperature stability, long fluid life and rust protection that approach Type V performance, and it is compatible in all proportions with commercial Type IV and Type V phosphate ester fluids.
Specifications and Approvals
- SAE AS1241D Type IV, Class 1 (low density)
- Boeing BMS 3-11P Type IV (low density) and Type V Grade B and C
- Airbus NSA 307110N Type IV (low density); Boeing Long Beach DMS2014H Type 4
- Also approved by ATR, BAE/Avro, Bombardier, Cessna, Embraer, Fokker, Gulfstream and Lockheed
Typical Properties
- Density at 15.6 °C (60 °F): 8.35 lb/US gal; specific gravity (25 °C): 0.996
- Kinematic viscosity: 10.6 mm²/s at 37.8 °C (100 °F); 1320 mm²/s at −54 °C (−65 °F)
- Flash point (COC): 176 °C (349 °F); fire point (COC): 188 °C (370 °F); autoignition: 427 °C (800 °F)
- Pour point: −62 °C (−80 °F); acid number: 0.04 mg KOH/g; cleanliness NAS 1638 Class 7
Benefits
- Lowest-density Type IV fluid, reducing hydraulic fluid weight on board
- Good low-temperature flow for extended-range and polar flights
- Protection against electrochemical erosion of servo valves and pumps; good deposit control
| Packing | 1 Qt or 1 Gallon or 5 Gallon or 55 USG |