DOD-PRF-85734A
TABLE I. Physical, chemical, and performance requirements - Continued.
Characteristic
Requirement
Test method
ASTM or SAE FED-STD-791
16/
Corrosion and oxidative stability
---
5308
c) 72 hours at 218 °C (425 °F)
Viscosity, percent change, maximum 10/
150
Total acid number change, maximum 11/
10.0
Metal weight change, mg/cm2, maximum
±0.2
Steel
±0.2
Silver (Ag)
±0.2
Aluminum (Al)
---
Magnesium (Mg)
---
Copper (Cu)
±0.2
Titanium (Ti)
Sludge content (filtered through 10 µm),
50
mg/100 ml of oil, maximum
1/
Alternate methods may be used if approved by the qualifying activity; however, only
FED-STD-791, method 3500, "Monobasic Acid Components of Synthetic Ester Lubricants by Gas
Chromatography," shall be used for referee tests.
2/
The initial viscosity shall be determined 35 ±1 minutes after the viscometer is placed in the bath
maintained at -40° ±1°C (-40° ±2°F) and again at 72 hours ±5 minutes after completion of initial
viscosity.
3/
Bath temperature shall be maintained at 204°C ±1°C (400°F ±2°F), for a 6.5 hour test period.
ASTM-E1, Thermometer 80F shall be used. Air temperature shall be maintained at 204°C ±1°C
(400°F ±2°F), using a preheater, if necessary.
4/
Complete foam collapse is that point at which no more than a single row of bubbles remain
around the cylinder wall and air inlet tube. If this ring of bubbles around the cylinder wall
contains segments having two or more layers of bubbles and the difference in height of the foam
in the ring is not greater than 10 milliliters (ml), complete foam collapse is the point at which a
break occurs in the ring of bubbles without subsequent reforming of the ring.
5/
SAE-AMS3217/1 and SAE-AMS3217/4 shall be tested in accordance with FED-STD-791,
method 3604, "Swelling of Synthetic Rubber by Aircraft Turbine Lubricants." Standard silicone
rubber shall be tested in accordance with FED-STD-791, method 3433, "Compatibility of
Synthetic Aircraft Turbine Lubricants with Silicone Rubber."
6/
See paragraph 4.4.1 for test method details.
7/
See paragraph 4.4.2 for test method.
8/
See paragraph 4.4.3 for test method.
9/
Tentative qualification approval shall be given to products meeting all other tests of the
qualification inspection (see 4.2). Final qualification approval will be awarded upon successful
completion of the extended storage stability tests. Failure to pass the extended storage stability
tests is cause for withdrawal of qualification approval (see 4.4.3).
10/
Compared with viscosity of new oil samples tested at 40°C (104°F).
11/
The total acid number shall be determined in accordance with SAE-ARP 5088.
8
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