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A-A-59290
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SPECIFICATION, GRADE, TYPE,
CLASS |
DESCRIPTION |
USES |
A-A-59290
Products |
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This commercial item
description (CID) covers a commercially available ethylene glycol that
has been modified with corrosion inhibitors.
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hydraulic fluid, arresting gear
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The modified glycol is generally used in aircraft arresting gear systems as a hydraulic fluid and is not interchangeable with any other type of grade of hydraulic fluid.
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Arresting Gear
(QC Lubricants)
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A-A-59290 Scope
This commercial item description (CID) covers a commercially available ethylene glycol that has been modified with corrosion inhibitors. The modified glycol is generally used in aircraft arresting gear systems as a hydraulic fluid and is not interchangeable with any other type of grade of hydraulic fluid.
A-A-59290 Composition
The hydraulic fluid shall be a mixture of ethylene glycol, water, triethanolamine phosphate, and sodium mercaptobenzothiazole (NaMBT)
TABLE I. Composition
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| |
Percent by Weight |
| Component |
Minimum |
Maximum |
| Ethylene
glycol |
93.95 |
------- |
| Water 1/ |
2.50 |
3.00 |
| Triethanolamin phosphate
2/ |
2.25 |
2.75 |
| NaMBT 3/ |
0.20 |
0.30 |
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1/ Total percent water includes any water present in the other components.
2/ A mixture of commercially pure triethanolamine and commercially pure
phosphoric acid.
3/ An aqueous solution of not less than 45 percent by weight of NaMBT and
water. Chemically pure sodium sulfite, when used as a stabilizer, shall be
not greater than 1 percent by weight of the formulated NaMBT solution.
NaMBT shall conform to the requirements of table II.
TABLE II. Chemical and physical properties of NaMBT inhibitor
| Property |
Requirement |
Test Method |
| Color |
Not darker than 15 |
ASTM-D1544 |
| Specific gravity at 25°C/25°C (77°F/77°F) |
1.27 ±0.03 |
ASTM-D1122 |
| Suspended matter |
None |
Visual |
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Solubility at 25° ±5°C (77° ±8°F) in: Water after 24 hours
1/
Ethylene glycol after 24 hours 2/ Water and ethylene
glycol after
16 hours 3/
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Soluble; slight haze, maximum Soluble; no
haze or cloudiness Soluble; slight opalescence, maximum |
Visual |
| Free alkalinity at 25° ±3°C (77° ±5°F),
grams of NaOH per 100 mL of sample 4/ |
0.05 to 0.75 |
ASTM-D1121 |
1/ Total
percent water includes any water present in the other components.
2/ A mixture of commercially pure
triethanolamine and commercially pure
phosphoric acid.
3/ An aqueous solution of not less than 45
percent by weight of NaMBT and
water. Chemically pure sodium sulfite, when used as a stabilizer, shall
be
not greater than 1 percent by weight of the formulated NaMBT solution.
NaMBT shall conform to the requirements of table II.
TABLE III. Chemical and physical properties of hydraulic fluid
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Property
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Requirement
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Test Method or Paragraph
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Phosphate content (calculated as phosphoric acid), percent,
minimum
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0.56
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3.3.1
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pH value of a 50 percent aqueous solution (by volume) at 25°
±3°C (77° ±5°F)
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7.2 to 7.8
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ASTM-D1287
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Boiling point, minimum
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165°C (329°F)
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ASTM-D1120
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Ash content, percent by weight, maximum
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0.52
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ASTM-D1119
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Specific gravity of undiluted material at
15.5°C/15.5°C (60°F/60°F)
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1.111 to 1.123
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ASTM-D1122
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Viscosity at 37.7°C (100°F), centistokes, minimum
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9.0
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ASTM-D445
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Give us a call for pricing and availability.
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