Mobil HyJet V
Fire-resistant Type V phosphate ester hydraulic fluid for commercial aircraft, SAE AS1241
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Approved by
Standards & approvals
SAE AS1241
Fire-resistant phosphate-ester aircraft hydraulic fluid
SAE Aerospace standard for fire-resistant phosphate-ester hydraulic fluids for commercial aircraft (Types IV/V).
NSA 307110 Type V
Airbus NSA 307110 Type V (aviation hydraulic fluid)
Airbus specification for phosphate-ester aviation hydraulic fluids, Type V, for high-pressure hydraulic systems including the 5000 psi system of the A380.
Boeing DMS2014H Type 5
Boeing DMS 2014H Type 5
Boeing (former Douglas, Long Beach) specification for phosphate-ester, fire-resistant aircraft hydraulic fluids, Type 5.
Boeing BMS 3-11P Type V
Boeing specification for phosphate-ester, fire-resistant aircraft hydraulic fluids, Type V, with better thermal stability than Type IV. Applies to the hydraulic systems of Boeing aircraft.
Also listed
Specifications
- Brand
- Mobil (ExxonMobil)
- Range
- Mobil HyJet
- Category
- Aviation hydraulic fluids
- Manufacturer code
- 201550303030
- Availability
- On request
Typical characteristics
| Property | Typical value | Method |
|---|---|---|
| Acid numbermgKOH/g | 0.04 | ASTM D974 |
| Bulk Modulus, Isothermal secant at 100 F/3000 psipsi | 210000 | ASTM D6793 |
| Calcium, ppm, ICPES | 4 | |
| Chlorine, ppm, XRF | 10 | |
| Conductivity @ 20 C, MicS/cm | 0.4 | ASTM D2624 |
| Foam, Sequence I, Collapse Time, s | 32/18 | ASTM D892 |
| Foam, Sequence II, Collapse Time, s | 23/13 | ASTM D892 |
| Foam, Sequence III, Collapse Time, s | 34/19 | ASTM D892 |
| Kinematic viscosity @ 100 Fmm2/s | 10.6 | ASTM D445 |
| Kinematic viscosity @ 127.6 Cmm2/s | 2.6 | ASTM D445 |
| Kinematic viscosity @ -15 Fmm2/s | 132 | ASTM D445 |
| Kinematic viscosity @ 210 Fmm2/s | 3.6 | ASTM D445 |
| Kinematic viscosity @ -65 Fmm2/s | 1350 | ASTM D445 |
| Potassium, ppm, ICPES/AA | 38 | |
| Shear stability, % Kinematic viscosity Loss, 40 C% | 21 | ASTM D5621 |
| Sodium, ppm, ICPES | 1 | |
| Specific gravity, 25 C/25 C | 0.997 | ASTM D4052 |
| Specific Heat Capacity, cal/g-deg.C, Reference | 0.42 | |
| Sulphur, ppm, ICPES/XRF | 51 | |
| Thermal Conductivity at 40 C, Cal / (cm s oC), Reference | 33x10^-5 (0.0799) | |
| Viscosity index | 280 | ASTM D2270 |
| Water content, mass% | 0.09 | ASTM D6304 |
| Pour point°F | -80 | ASTM D97 / ASTM D5950 |
| NAS 1638 class, HIAC | 7 | ISO 11500 |
Complete documentation

Manufacturer's description
Mobil HyJet V is a Type V fire-resistant phosphate ester hydraulic fluid with thermal and hydrolytic stability superior to commercially available Type IV fluids. Better stability means less fluid degradation in aircraft systems, longer in-service fluid life, and potentially lower maintenance costs for aircraft operators. It provides excellent high- and low-temperature flow properties, strong rust protection, and improved erosion protection compared with Type IV fluids. Designed for commercial aircraft phosphate ester hydraulic systems, Mobil HyJet V meets SAE AS1241 requirements and is compatible in all proportions with other commercial Type IV and Type V phosphate ester aviation hydraulic fluids. Its low density helps reduce aircraft weight and fuel consumption, while its excellent low- and high-temperature viscosity balance and deposit control support precise hydraulic system control and longer equipment life. The fluid is approved by major airframe manufacturers, including Airbus (NSA 307110N, Type V), Boeing (BMS 3-11P, Type V, Grade A and C; Boeing-Long Beach DMS2014H, Type 5) and Gulfstream (1159SCH302J, Type V), and appears on their Qualified Products Lists.
Applications
- Mobil HyJet V is designed for use in commercial aircraft phosphate ester hydraulic systems.
- It meets the SAE AS1241 requirements and is included in commercial and business airframe manufacturer Qualified Products Lists.
- Compatible in all proportions with commercial Type IV and Type V phosphate ester aviation hydraulic fluids.
Performance & benefits
- Higher stability than Type IV fluids, meeting Boeing BMS 3-11 and SAE AS1241 Type IV and Type V requirements, which reduces the need to replace fluid due to degradation and lowers hydraulic system maintenance costs.
- Improved flammability characteristics over meeting just the Type V requirements.
- Low density, reducing the weight of hydraulic fluid carried by the aircraft, fuel consumption and operating costs.
- Excellent rust protection, reducing the risk of equipment damage in the event of major water contamination.
- Excellent low- and high-temperature viscosity balance, providing precise hydraulic system control and response even during extended-range or polar flights.
- Excellent deposit control, extending the aircraft hydraulic system's equipment life and reducing maintenance costs.
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