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Exxon Mobil Hyjet IV-A Plus Aviation Hydraulic Fluid

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Overview

Exxon HyJet IV-A plus is a fire-resistant phosphate ester hydraulic fluid designed for use in commercial aircraft. It is the best-performing Type IV fluid and approaches to a great extent many of the performance capabilities of Type V fluids, including high temperature stability, long fluid life, low density, and rust protection.
It is superior to all other Type IV fluids in these respects. Exxon HyJet IV-A plus meets the specifications of all major aircraft manufacturers and SAE AS1241

Features

Features
Advantages and Potential Benefits
Best in high temperature stability among Type IV fluids
Longer fluid life.
Lesser need to replace fluid due to degradation.
Reduced hydraulic system maintenance costs
Lowest density Type IV fluid
Reduced weight of the hydraulic fluid carried by aircraft.
Reduced aircraft fuel consumption, lower operating costs
Effective rust protection
Reduced the risk of equipment damage in the event of major water contamination
Excellent low temperature flow (viscosity) properties
Precise hydraulic system control and response even during extended range/polar flights.
Longer equipment life
Excellent deposit control
Longer equipment life.
Reduced maintenance costs
Excellent protection against electro-chemical corrosion (erosion)
Protection against servo valve and pump damage
Approved by all major aircraft manufacturers
Use as fleet lubricant by airline operators
Fully compatible with all approved phosphate ester hydraulic fluids
Flexibility in use by airline operators

Specifications

HyJet IV-A plus
Meets Type lV, Low desnsity
Is in Qualified products List
SAE Aerospace Standard AS1241C
X
Not Applicable
Airbus NSA307110N
X
X
ATR NSA307110N
X
X
Boeing BMS 3-11P, Type IV, Class 1 and Type V, Grade B and Grade C Â
X
X
Boeing (Douglas Division) DMS 2014H
X
X
British Aerospace (Avro) BAC.M.333C
X
X
Bombardier/Canadair BAMS 564-003A
X
X
Bombardier/DeHavilland
X
X
Cessna
X
X
Embraer
X
X
Fokker
X
X
Gulfstream Aerospace 1159SCH302J
X
X
Lockheed C-34-1224C
X
X

Applications

  • Exxon HyJet IV-A plus fire-resistant aviation hydraulic fluid is used in commercial aircraft hydraulic systems where phosphate hydraulic fluids are recommended. It is compatible in all proportions with commercial Type IV and Type V phosphate ester aviation hydraulic fluids.
  • Exxon HyJet IV-A plus meets or exceeds the following industry and aircraft builder specifications. It is approved against all commercial aircraft manufacturer requirements and is included in their Qualified Products Lists.

Documents

Properties
Test Method
HyJet IV-A plus (1)
Limits
Kinematic Viscosity, cSt
ASTM D 445
at -53.9ºC (-65ºF)
1320
2000 max
at -26.1ºC (-15ºF)
130
135 max
at 37.8ºC (100ºF)
10.6
10.0 -11.0
at 98.9ºC (210ºF)
3.6
3.35 - 3.75
at 127.6ºC (260ºF)
2.6
1.5 min
Viscosity Index
ASTM D 2270
280
Shear Stability, % Viscosity Drop at 40ºC
ASTM D 5621
22
Pour Point, ºC (ºF)
ASTM D 97
‹-62 (-80)
-62 (-80) max
Specific Gravity at 25ºC/25ºC (77ºF/77ºF)
ASTM D 4052
0.996
0.990 -1.002
Density at 15.6ºC (60ºF), g/mL (lb/gal)
ASTM D 4052
0.999 (8.35)
Acid Number, mg KOH/g
ASTM D 974
0.04
0.1 max
Water, Karl Fischer, mass %
ASTM D 6304
0.1
0.2 max
Flammability
Flash Point, ºC (ºF)
ASTM D 92
176 (349)
160 (320) min
Fire Point, ºC (ºF)
ASTM D 92
188 (370)
177 (350) min
Autoignition Point, ºC (ºF)
ASTM D 2155
›427 (800)
400 (752) min
Foaming Tendency/Stability, mL foam/sec to collapse
ASTM D 892
Sequence I
27/15
250/100 max
Sequence Il
23/13
150/50 max
Sequence Ill
28/16
450/250 max
Particle Count, NAS 1638 Class
Auto Counter
4
7 max
Chemical Elements, ppm
Calcium
103
120 max
Potassium
38
48 max
Chlorine
10
50 max
Sodium
1
15 max
Sulfur
224
350 max
Four-Ball Wear, Scar diameter at 75ºC/600rpm/1hour, mm
Modified ASTM D 4172
4 kg
0.22
0.45 max
10 kg
0.33
0.50 max
40 kg
0.73
0.55 – 0.85
Electrical Conductivity at 20ºC, microSiemens/cm
1.4
0.5 min
Bulk Modulus, Isothermal secant at 100ºF/3000 psi, psi
210,000
Thermal Conductivity at 40ºC, cal/sec/cm2/ºC (Btu/hr/ft2/ºF)
33x10^-5 (0.0799)
Coefficient of Thermal Expansion, 25 to 100ºC, per ºC (per ºF)
0.00086 (0.00048)
Specific Heat Capacity at 40 ºC, cal/g/ºC (same as Btu/lb/ºF)
0.41

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Please note, Aircraft Spruce Canada's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce Canada assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: Can you please tell me what the shelf life is on this Exxon Mobil Hyjet IV-A Plus Aviation Hydraulic Fluid product? This will depend on how much or how little we purchase at one time.

Shelf life: 10 years in quarts/gallons; 5 years in pails/drums.

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