MIL-PRF-23699 Lubricating Oil, Aircraft Turbine Engine, Synthetic Base, Nato Code Numbers: O-152, O-154, O-156, And O-167This specification covers four classes of gas turbine engine lubricating oils, primarily used for aircraft engines, which have a nominal viscosity of 5 centistokes at 100 ┬░C and which are typically made with neopentyl polyol ester base stocks. This oil is identified by NATO Code Numbers O-152, O-154, O-156, and O-167.

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MIL-PRF-23699G

AEROSPACE RECOMMENDED PRACTICE (ARP)

SAE ARP5088

Test Method for the Determination of Total Acidity in Polyol Ester

and Diester Gas Turbine Lubricants by Automatic Potentiometric

Titration

SAE ARP6166

Minisimulator Method

SAE ARP6179

Evaluation of Gas Turbine Engine Lubricant Compatibility with

Elastomer O-Rings

(Copies of these documents are available from https://www.sae.org or from the Society of

Automotive Engineers International, 400 Commonwealth Drive, Warrendale, PA 15096-0001.)

2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a

conflict between the text of this document and the references cited herein, the text of this

document takes precedence. Nothing in this document, however, supersedes applicable laws and

regulations unless a specific exemption has been obtained.

3. REQUIREMENTS

3.1 Qualification. The lubricating oil furnished under this specification shall be products

that are authorized by the qualifying activity for listing on the applicable qualified products list

before contract award (see 4.2, 6.3, 6.4, and 6.5).

3.2 Materials. The composition of the lubricating oil is not limited; however, materials

containing barium, organic compounds of titanium, and known or suspected human carcinogens

(as defined by the National Toxicology Program's Annual Report on Carcinogens) are

prohibited. Recycled basestocks are permitted; however, each batch shall be fully tested in

accordance with the qualification requirements of this specification. If a tricresyl phosphate

(TCP) additive is used, the TCP additive shall not contain more than 0.2 percent by weight of

ortho cresol containing isomers of tricresyl phosphate. The manufacturer may be required to

submit certification of conformance to this section (see 6.2).

3.2.1 Acid assay. The acid components, in mole percent, of the finished oil submitted as

the qualification test sample, and reported on batch conformance reports, shall be determined in

accordance with FED-STD-791, method 3500 or other equivalent gas chromatography methods.

The manufacturer may then select a range of 10 mole-percent for each acid component to bracket

the values measured on the qualification sample by the qualifying laboratory. The major acid

components (10 mole-percent or greater) of production lots of oil shall fall within the stated

range for each acid. The minor acid components shall not exceed 10 total mole-percent in bulk

lots.

a. Alternate methods may be used if approved by the qualifying activity; however, only

FED-STD-791, method 3500, shall be used for referee tests.