当前位置：文档库 › MiL-PRF-23699G

MiL-PRF-23699G

METRIC

PERFORMANCE SPECIFICATION

LUBRICATING OIL, AIRCRAFT TURBINE ENGINE,

SYNTHETIC BASE, NATO CODE NUMBERS: O-152, O-154, O-156, and O-167

This specification is approved for use by all Departments and Agencies of the Department of Defense.

1. SCOPE

1.1 Scope. This 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.

1.2 Classification. The lubricating oil is furnished in the following classes as specified:

Comments, suggestions, or questions on this document should be addressed to: Commander, Naval Air Warfare Center Aircraft Division, Code 4L8000B120-3, Highway 547, Lakehurst, NJ 08733-5100 or emailed to michael.sikora@https://www.wendangku.net/doc/8f1421679.html,. Since contact information can change, you may want to verify the currency of this address information using the ASSIST Online database at https://https://www.wendangku.net/doc/8f1421679.html,.

AMSC N/A FSC 9150

2. APPLICABLE DOCUMENTS

2.1 General. The documents listed in this section are specified in sections 3 and 4 of this specification. This section does not include documents cited in other sections of this specification or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements cited in sections 3 and 4 of this specification, whether or not they are listed.

2.2 Government documents.

2.2.1 Specifications and standards. The following specifications and standards form a part

of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract.

FEDERAL STANDARD

FED-STD-791 - Testing Methods of Lubricants, Liquid Fuels, and Related

Products

DEPARTMENT OF DEFENSE SPECIFICATIONS

MIL-PRF-7808 - Lubricating Oil, Aircraft Turbine Engine, Synthetic Base

MIL-DTL-85694 - Spectrometric Oil Standards

DOD-PRF-85734 - Lubricating Oil, Helicopter Transmission System, Synthetic

Base

SD-6 - Provisions Governing Qualification, Qualified Products Lists

and Qualified Manufacturers Lists

(Copies of these documents are available online at https://www.wendangku.net/doc/8f1421679.html, or

https://https://www.wendangku.net/doc/8f1421679.html, or from the Standardization Document Order Desk, 700 Robbins

Avenue, Building 4D, Philadelphia, PA 19111-5094.)

2.2.2 Other Government documents, drawings, and publications. The following other Government documents, drawings, and publications form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract.)

DEPARTMENT OF DEFENSE TECHNICAL MANUAL

DEPARTMENT OF THE NAVY

NAVAIR 17-15-50.2 - Joint Oil Analysis Program Manual Volume II,

Spectrometer and Physical Test Laboratory Operating

Requirements and Procedures.

(Application for copies are available from Naval Air Systems Command, Navy Oil Analysis Program, 22229 Elmer Road, Building 2360, Unit 4, Patuxent River, MD 20670-1534.)

2.3 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract.

ASTM INTERNATIONAL

ASTM D92 - Standard Test Method for Flash and Fire Points by Cleveland Open

Cup Tester

ASTM D97 - Standard Test Method for Pour Point of Petroleum Products

ASTM D445 - Standard Test Method for Kinematic Viscosity of Transparent and

Opaque Liquids (and Calculation of Dynamic Viscosity) ASTM D471 - Standard Test Method for Rubber Property-Effect of Liquids

ASTM D892 - Standard Test Method for Foaming Characteristics of Lubricating

Oils

ASTM D972 - Standard Test Method for Evaporation Loss of Lubricating Greases

and Oils

ASTM D1748 - Standard Test Method for Rust Protection by Metal Preservatives

in the Humidity Cabinet

ASTM D2532 - Standard Test Method for Viscosity and Viscosity Change After

Standing at Low Temperature of Aircraft Turbine Lubricants ASTM D2603 - Standard Test Method for Sonic Shear Stability of

Polymer-Containing Oils

ASTM D4057 - Standard Practice for Manual Sampling of Petroleum and

Petroleum Products

ASTM D4177 - Standard Practice for Automatic Sampling of Petroleum and

Petroleum Products

ASTM D4636 - Standard Test Method for Corrosiveness and Oxidation Stability of

Hydraulic Oils, Aircraft Turbine Engine Lubricants, and Other

Highly Refined Oils

ASTM D5185 - Standard Test Method for Multielement Determination of Used

and Unused Lubricating Oils and Base Oils by Inductively

Coupled Plasma Atomic Emission Spectrometry (ICP-AES)

ASTM D5949 - Standard Test Method for Pour Point of Petroleum Products

(Automatic Pressure Pulsing Method)

ASTM D5950 - Standard Test Method for Pour Point of Petroleum Products

(Automatic Tilt Method)

ASTM D5985 - Standard Test Method for Pour Point of Petroleum Products

(Rotational Method)

ASTM D6595 - Standard Test Method for Determination of Wear Metals and

Contaminants in Used Lubricating Oils or Used Hydraulic Fluids

by Rotating Disc Electrode Atomic Emission Spectrometry (Copies of these documents are available from https://www.wendangku.net/doc/8f1421679.html, or ASTM International,100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.)

AMERICAN SOCIETY FOR QUALITY (ASQ)

ANSI/ASQ Z1.4 - Sampling Procedures and Tables for Inspection by Attributes (Copies of this document are available from https://www.wendangku.net/doc/8f1421679.html, or the American Society for Quality, 600 Plankinton Avenue, Milwaukee, WI 53203.)

NATIONAL TOXICOLOGY PROGRAM

Annual Report on Carcinogens

(Copies of this document are available from https://www.wendangku.net/doc/8f1421679.html, or the National Toxicology Program, P.O. Box 12233, Research Triangle Park, NC 27709.)

SAE INTERNATIONAL

AEROSPACE MATERIAL SPECIFICATIONS (AMS)

SAE AMS3085 Fluid, Reference for Testing AS5780 HPC Class (Polyol) Resistant

Material

SAE AMS3217/1 - Test Slabs, Acrylonitrile Butadiene (NBR-H), Medium-High

Acrylonitrile, 65-75

SAE AMS3217/4 - Test Slabs, Fluoroelastomer (FKM), 65-75

SAE AMS3217/5 - Test Slabs, Fluorosilicone (FVMQ) 55-65

SAE AMS7276 - Rubber: Fluorocarbon (FKM) High-Temperature-Fluid Resistant

Low Compression Set For Seals In Fuel Systems and Specific

Engine Oil Systems

SAE AMS R 83485 - Rubber, Fluorocarbon Elastomer, Improved Performance at Low

Temperatures

SAE AMS4900 - Titanium Sheet, Strip, and Plate Commercially Pure Annealed, 55

ksi (379 MPa) Yield Strength

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.wendangku.net/doc/8f1421679.html, 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.

3.3 Chemical and physical requirements. All classifications of the lubricating oil shall conform to the requirements specified in table I.

TABLE I. Physical, chemical, and performance requirements.

Characteristic Requirement Test Method Reference

Paragraph Acid assay Report FED-STD-791,

Method 3500

3.2.1 Viscosity, mm2/s (cSt) at -40 °C , maximum 13,000 ASTM D2532

Percent change after 72 hours at -40 °C,

maximum ±6 4.4.1 Viscosity, mm2/s (cSt), ASTM D445

at 100 °C 4.90 - 5.40

at 40 °C, minimum 23.0

Flash point, minimum 246 °C ASTM D92

Pour point, maximum -54 °C ASTM D97 or

ASTM D5950

ASTM D5985

ASTM D5949

Total acid number, mg KOH/g, maximum

STD, C/I, HTS classes EE class 1.00

0.75

SAE ARP5088

Evaporation loss, percent by weight, 6.5 hours

at 204 °C, maximum 10

ASTM D972 4.4.2

Foaming, foam volume, mL, maximum ASTM D892

5 minutes aeration at 24 °C 25

1 minute settling at 24 °C nil

5 minutes aeration at 93.5 °C 25

1 minute settling at 93.5 °C nil

5 minutes aeration at 24 °C (after test at

93.5 °C, above)

1 minute settling at 24 °C nil

TABLE I. Physical, chemical, and performance requirements - Continued.

Characteristic Requirement Test Method Reference

Paragraph Rubber compatibility

Rubber swell, percent increase

SAE AMS3217/1, 72 hours at 70 °C

SAE AMS3217/4, 72 hours at 204 °C

Standard silicone rubber, 96 hours at 121 °C Tensile strength loss, percent, max

Standard silicone rubber, 96 hours at 121 °C 5 - 25

5 - 25

FED-STD-791

Method 3604

Method 3433

4.4.3 and

4.4.3.1

Expanded Rubber Compatibility

SAE AMS3217/5, 72 hours at 150 o C Rubber swell, percent increase

Tensile strength loss, percent, max Elongation loss, percent, max

Hardness loss, max EE Class only

2 - 25

ASTM D471 4.4.4 and

4.4.4.1

Fluorocarbon SAE AMS7276

Suspended o-rings: 70 hours at 175 °C Tensile strength loss, percent, max Elongation loss, percent, max

Mass increase, percent, max

Rubber swell, percent increase

Hardness loss, percent, max EE Class only

5 - 17

SAE ARP6179 4.4.4 and

4.4.4.2

Fluorocarbon SAE AMS7276

Compressed o-rings: 480 hrs at 175 °C Compression set, percent, max EE Class only

SAE ARP6179 4.4.4 and

4.4.4.2

Fluorocarbon SAE AMS-R-83485 Suspended/Compressed o-rings:

480 hours at 175 °C

Tensile strength loss, percent, max Elongation loss, percent, max

Mass increase, percent, max

Rubber swell, percent increase

Hardness loss, percent, max

Compression set, percent, max EE Class only

5 - 25

SAE ARP6179 4.4.4 and

4.4.4.3

Compatibility

Turbidity

Sediment, mg/l, maximum Compatible

None

FED-STD-791

Method 3403 4.4.5

Low temperature Storage Stability, 6 weeks at -18 °C No crystallization,

separation or

gelling.

4.4.6

Stability Testing of First Production Run Meet conformance

inspection 4.4.7

TABLE I. Physical, chemical, and performance requirements - Continued.

Characteristic Requirement Test Method Reference

Paragraph Thermal stability and corrosivity at 274 °C

Viscosity change, maximum

Total acid number change, mg KOH/g, maximum

Weight of metal change, maximum

5.0 percent

6.0

+/- 4.0 mg/cm2

FED-STD-791,

Method 3411 4.4.8

Sediment

Visual undissolved water

Sediment through 1.2 micron filter, maximum

Total ash content, maximum

none

10 mg/l

1 mg/l

FED-STD-791,

Method 3010 4.4.9

Shear stability, viscosity loss at 40 °C,

maximum 4 percent ASTM D2603 4.4.10 Trace metal content by RDE-AES, ppm

(mg/kg), maximum Aluminum (Al)

Iron (Fe)

Chromium (Cr)

Silver (Ag)

Copper (Cu)

Tin (Sn)

Magnesium (Mg) Nickel (Ni)

Titanium (Ti)

Silicon (Si)

Zinc (Zn)

Lead (Pb)

Molybdenum (Mo) Boron (B) 2

ASTM D6595 4.4.11

Trace metal content ICP-AES, ppm (mg/kg), maximum

Aluminum (Al)

Iron (Fe)

Chromium (Cr)

Silver (Ag)

Copper (Cu)

Tin (Sn)

Magnesium (Mg) Nickel (Ni)

Titanium (Ti)

Silicon (Si)

Zinc (Zn)

Lead (Pb)

Molybdenum (Mo) Boron (B) 2

ASTM D5185 4.4.11

TABLE I. Physical, chemical, and performance requirements - Continued.

Characteristic

Requirement

Test Method Reference

Paragraph STD and

C/I Classes

HTS and

EE Classes

Corrosion and oxidative stability a) 72 hours at 175 °C

Viscosity, percent change

Total acid number change, mg KOH/g, maximum

Metal weight change, mg/cm2, maximum

Steel

Silver (Ag)

Aluminum (Al)

Magnesium (Mg)

Copper (Cu)

Titanium (Ti)

Sludge content (filtered through 10 μm), mg/100 mL of oil, maximum -5 to +15

2.0

±0.2

±0.4

---

0 to +10

1.0

±0.2

±0.4

---

ASTM D4636,

Alternate

Procedure 2

4.4.12

Corrosion and oxidative stability b) 72 hours at 204 °C

Viscosity, percent change

Total acid number change, mg KOH/g, maximum

Metal weight change, mg/cm2, maximum

Steel

Silver (Ag)

Aluminum (Al)

Magnesium (Mg)

Copper (Cu)

Titanium (Ti)

Sludge content, (filtered through 10 μm), mg/100 mL oil, maximum -5 to +25

3.0

±0.2

±0.4

---

0 to +22.5

2.0

±0.2

±0.4

---

ASTM D4636,

Alternate

Procedure 2

4.4.12

TABLE I. Physical, chemical, and performance requirements - Continued.

Characteristic

Requirement

Test Method Reference

Paragraph STD and C/I

Classes

HTS and EE

Classes

Corrosion and oxidative stability c) 72 hours at 218 °C

Viscosity, percent change

Total acid number change, mg KOH/g, maximum

Metal weight change, mg/cm2, maximum Steel

Silver (Ag)

Aluminum (Al)

Magnesium (Mg)

Copper (Cu)

Titanium (Ti)

Sludge content (filtered through 10 μm), mg/100 mL oil, maximum 120

±0.2

---

±0.2

60 max

10 max

±0.2

---

±0.2

ASTM

D4636,

Alternate

Procedure 2

4.4.12

3.4 Bench performance requirements. Bench performance requirements shall be as specified in table II.

TABLE II. Bench performance requirements.

3.5 Full-scale performance requirements.

3.5.1 Turboshaft engine. The oils shall be tested in a full-scale turboshaft engine in accordance with

4.4.17 to evaluate its serviceability and to ensure that engine components are compatible with the lubricating oil. The post-test condition of the engine shall not indicate excessive or unusual deposits, wear or corrosion which are attributed to the test oil.

3.5.2 Service evaluation. The oil shall be rated as satisfactory after the model engine evaluation and flight evaluation tests specified in

4.4.18.

3.6 Toxicity. The lubricating oil shall have no adverse effect on the health of personnel when used for its intended purpose (see 6.8).

4. VERIFICATION

4.1 Classification of inspections. The inspection requirements specified herein shall be classified as follows:

a. Qualification inspection (see 4.2).

b. Conformance inspection (see 4.3).

4.2 Qualification inspection. Qualification inspection shall consist of testing to all the requirements specified in this specification. When required by the qualification activity, additional evaluations (engine and flight test service evaluation) may be required on candidate formulations.

4.2.1 Qualification process. The general outline of the qualification process (see 6.3) is described in SD-6.

4.2.2 Requalification. Requalification shall be required when any change is made in source of manufacture, purity, or composition of the lubricating oil base stocks or additives. A minor change in the oil formulation may be made without requalification testing, but only after notification to, and approval by, the qualification activity. Two specific requalification categories are reblend and rebrand, outlined in 4.2.2.1 and 4.2.2.2.

4.2.2.1 Reblend lubricating oil. A reblend lubricating oil is an original qualified product, as specified in 4.2, in which one or more ingredients have been blended by a manufacturer other than the manufacturer of the original formulation. A sample of the reblended lubricating oil shall be subjected to the qualification tests (see 4.2). The engine performance requirements (see 3.

5.1) may be waived, at the discretion of the qualification activity, if the other test results indicate equivalence to the original formulation. Reblend approvals are initiated by the process specified in

6.3.

4.2.2.2 Rebrand lubricating oil qualification. A rebrand lubricating oil is a lubricating oil which has successfully passed the qualification tests (see 4.2) and is manufactured by the original formulator at the original manufacturing site but is packaged/distributed using a second party identifying trade name. Rebrand approvals are initiated by the process specified in 6.3.

4.2.3 Qualification inspection sample. The qualification test sample shall consist of 208 liters (55 gallons) of finished lubricating oil and 19 liters (5 gallons) of the base oil without additives. A minimum of 100 grams of each additive ingredient used in the manufacture of the qualification test sample shall be submitted prior to qualification (see 6.3.2).

4.3 Conformance inspection. Conformance inspection of production lots shall consist of all of the tests specified in table III. Failure of production lots to pass any of the conformance tests shall be cause for rejection of the lot.

TABLE III. Conformance tests.

4.3.1 Manufacturing tolerances. Finished turbine engine oils shall be of the same composition and manufactured at the same plants and by the same methods as those used in the qualified formulation.

4.3.1.1 Additives. Additives shall be of the same composition and manufactured at the same plants and by the same methods as those used in the qualified formulation. Additive treat rates for each manufactured batch shall not vary from those specified in table IV.

TABLE IV. Additive batch concentration tolerances.

Nominal Composition of the Approved Material, %wt Range as Percentage of the Nominal Value

≥2 ± 5

>0.1 - <2 ±10

≤0.1 ±20

4.3.1.2 Basestocks. Basestocks shall be of the same composition and manufactured at the same plants and by the same methods as those used in the qualified formulation. Incidental cross contamination by neopentyl polyol esters other than those used in the original qualification, but suitable by nature and quality for use in aviation turbine oil applications, shall not exceed 1.0 percent by weight.

4.3.2 Government lot acceptance. In accordance with the contract, Government lot acceptance testing is required.

4.3.2.1 First production lot samples. Stability testing on the first production run will be performed as outlined in 4.4.7. A sample of five cases of 1 quart containers (120 containers) of material from the first production lot supplied to the procuring agency after qualification.

4.3.2.2 Production lot samples. In accordance with the contract, samples from every production lot will be supplied to the procuring activity.

4.3.2.3 Production lot shipping address: Production lot samples (see 4.3.2.1 and 4.3.2.2) shall be shipped to Naval Air Station, Hazmart Building 2385, Sample (AIR 4.4.2), 22680 Hammond Road, Patuxent River, MD 20670.

4.3.3 Sampling and inspection of oil. Each bulk lot (see 6.9) of material shall be sampled at random in accordance with ASTM D4057 or ASTM D4177 for the conformance inspection tests (see table III). Inspections shall meet or exceed requirements specified in the government contract or order.

4.3.3.1 Conformance test inspection report. The conformance inspection report (see 6.2) on each lot of oil shall be provided via electronic means or mailed to the following address: ATTN: Naval Air Systems Command, AIR 4.4.2.2, Propulsion Lubricants Team, 22229 Elmer Road, Building 2360, Unit 4, Patuxent River, MD 20670-1534.

4.3.4 Examination of filled containers. A random sample of filled containers from each packaged lot (see 6.9), taken in accordance with ASQ-Z1.4, shall be examined with regard to fill, closure, sealing and leakage.

4.4 Test methods. All tests shall be performed in accordance with tables I, II, and III.

4.4.1 Low temperature viscosity. For the purposes of determining the percent viscosity change, the initial viscosity shall be determined 35 ±1 minutes after the viscometer is placed in the bath maintained at -40 ±1.05 °C and again at 72 hours ±5 minutes after completion of initial viscosity.

4.4.2 Evaporation loss. Bath temperature shall be maintained at 204 ±1°C, for the 6.5 hour test period. Air temperature shall be maintained at 204 ±1°C, using a pre-heater, if necessary.

4.4.3 Rubber compatibility. Standard elastomer stocks shall conform to SAE AMS3217/1, SAE AMS3217/4, SAE AMS3217/5, SAE AMS7276, and SAE AMS R 8348

4.4.3.1 Rubber swell. SAE AMS3217/1 and SAE AMS3217/4 shall be tested in accordance with FED-STD-791, method 3604. Standard Silicone Rubber shall be tested in accordance with FED-STD-791, method 3433.

4.4.4 Expanded rubber compatibility. The expanded rubber compatibility tests performed using ASTM D471 and SAE ARP6179 test methods are only required for the EE class.

4.4.4.1 SAE AMS3217/5 rubber compatibility. ASTM D471 modified procedure uses eight specimens, four cut using ASTM Die C (for tensile strength, elongation, and hardness properties) and four cut to 50 by 25 mm (for swell property). All eight specimens shall be suspended using stainless steel hangers submerged in 900 mL of oil in a sealed quart glass jar (a screw on lid lined with aluminum foil may be used). Aging shall be performed in an oven as stated in ASTM D471 with the single glass jar replacing the multiple test tube arrangement. Eight control specimens shall be used for baseline tensile strength, elongation, and hardness measurements.

4.4.4.2 SAE AMS7276 rubber compatibility. SAE AMS7276 shall be tested in duplicate with the EE candidate oil along with a single Reference Oil 300 (RO300 as in accordance with SAE AMS 3085) test and a single MIL-PRF-23699 STD class test; thus, a total of four cell assemblies per SAE ARP6179 are needed for one EE class qualification test. The results are invalid if either the RO300 or the STD tests fail any of their respective elastomer property limits. The limits for the RO300 control oil for suspended testing are tensile strength loss: 30 percent minimum, swell increase: 22 percent minimum, and hardness loss: 24 percent minimum. The limits for the STD control oil for suspended testing are tensile strength loss: 25 percent maximum, swell increase: 17 percent maximum, and hardness loss: 20 percent maximum. The limits for the compressed tests for RO300 and STD control oils are a compression set loss of 45 percent minimum and 35 percent maximum, respectively. The combined average of the duplicate tests for the candidate EE oil shall be reported along with the average of the RO300 and STD class oil tests for each of the listed properties. A single batch of SAE AMS7276 material has been set aside for this testing at the qualification laboratory as suggested in

SAE ARP6179.

4.4.4.3 SAE AMS R 83485 Rubber Compatibility. SAE AMS R 83485 shall be tested in duplicate with the EE candidate oil per SAE ARP6179. The combined average of the duplicate tests for the candidate EE oil shall be reported.

4.4.5 Compatibility. The compatibility test shall be performed in accordance with

FED-STD-791, method 3403 with the following exception: petroleum ether, with a boiling range of 30 to 60 °C, n-heptane, or hexane, shall be used in place of 1,1,1-trichloroethane

(O-T-620). Upon completion of the l68 hour oven period, the test flasks shall be stored in the dark at room temperature 24 ±5 °C for 21 days before visual inspection for turbidity. Sediment shall be determined in accordance with FED-STD-791, method 3010. If the amount of sediment collected after the exposure period is greater than the limit specified in table I additional testing may be performed on the mixture to determine that its performance meets the requirements of this specification. The additional testing may include all of the tests specified in this specification. Referee lubricating oils shall consist of selected oils qualified under this specification, MIL-PRF-7808 and DOD-PRF-85734.

4.4.6 Low temperature storage. Three one quart samples of oil shall be stored in a cold chamber maintained at -18 ±2.5 °C for 6 weeks. At the end of the storage period, the oil shall be visually inspected for evidence of crystallization, additive separation, and gelling.

4.4.7 Stability testing of first production run. Five cases of one quart containers (120 containers) from the first production batch of the tentatively qualified oil procured for U.S. government use (original qualification, reblend, or rebrand) shall be stored at a temperature of not lower than -40 °C and not greater than 60 °C for l2 months. At the end of the l2 month storage period the samples shall be examined for conformance to the inspection requirements of conformance inspection (see 4.3).

4.4.7.1 Tentative qualification approval. Tentative qualification approval is given to products meeting the qualification inspection (see 4.2). Final qualification approval shall be awarded upon successful completion of the stability testing of first production run. Failure to pass this test shall be cause for withdrawal of approval.

4.4.8 Thermal stability and corrosivity. Post test oil viscosity sample shall be compared with viscosity of new oil samples tested at 40 °C. Post test oil total acid number is compared

to the total acid number of the new oil sample. The viscosity shall be determined in accordance with ASTM D445. The total acid number shall be determined in accordance with

SAE ARP5088.

4.4.9 Sediment. Sediment measurement may be made using a silver membrane filter. If the total sediment does not exceed 1 mg/l, the ash content does not need to be determined.

4.4.10 Shear stability. Use an irradiation period of 30 minutes on a 30 mL oil sample at a power setting which causes 11.5 ±0.5 percent viscosity loss to a 30 mL sample of ASTM Reference Fluid, when irradiated for five minutes. ASTM Reference Fluid A is a petroleum oil

containing a polymer capable of being broken down by turbulence at high rates of shear;

typical viscosities are 10.7 mm2/s (cSt) at 100 °C and 57 mm2/s (cSt) at 40 °C. ASTM Reference Fluid A may be obtained from vendors listed in the ASTM D2603 method.

4.4.11 Trace metal content. The trace metal content of the oil for qualification testing shall

be determined both with a Rotating Disc Electrode - Atomic Emission Spectrometer (RDE-AES)

and Inductively Coupled Plasma - Atomic Emission Spectrometer (ICP-AES) spectrometer.

4.4.11.1 Spectrometer standardization. The spectrometer shall be standardized and

correlated in accordance with the JOAP Program Manual, NAVAIR 17-15-50.2 using

MIL-DTL-85694 standards. Immediately after standardizing the spectrometer, five determinations of the oil for trace metal content shall be performed. The average of the

five determinations shall be reported. Samples requiring trace metal content determinations

may be sent to: Naval Air Station, Hazmart Building 2385, Sample (AIR 4.4.6) – NOAP, 22680 Hammond Road, Patuxent River, MD 20670.

4.4.11.2 ICP adjustments. In accordance with ASTM D5185, modifications that allow for

the adjustments in the dilution of the sample are allowed to accurately measure 2 ppm (mg/kg) of metals in the ICP-AES spectrometer.

4.4.11.3 Trace metal conformance testing option. Trace metal content for conformance

testing (table III) can be tested using either RDE-AES spectrometer or ICP-AES spectrometer for

the same elements outlined in table I.

4.4.12 Corrosion and oxidation stability. The corrosion and oxidation stability test shall be performed in accordance with ASTM D4636, Alternate Procedure 2, with the following modifications:

a.Duplicate tests shall be run at three separate tests temperatures, each conducted for a

72 hour-duration, at the bath or block temperatures of: 175 ±2.5 °C, 204 ±2.5 °C, and

218 ±2.5 °C. The individual results shall be reported.

b. A suitable liquid medium or fluidized sand bath heating apparatus may be used in lieu

of an aluminum block heater.

c. After the sample tube has been in a liquid heating medium (or aluminum block) for 15

minutes, connect the dry air supply, adjust the air flow rate, and begin the test time.

d. An electrolytic grade silver test square shall be substituted for the cadmium plated

steel square; in the 218 °C test, substitute titanium conforming to SAE AMS4900 (or

equivalent), for copper and magnesium; stainless steel or nickel-chrome wire may be

used to tie the metal coupons together at all test conditions.

e. Post test oil viscosity sample is compared with viscosity of new oil samples tested at

40 °C . Post test oil total acid number is compared to the total acid number of the

new oil sample. The total acid number shall be determined in accordance with

SAE ARP5088.

f. The glassware from FED-STD-791, method 5308 can be used.

The post-test sludge content shall be determined as follows:

g. Decant oil from the test tube through a preweighed l0.0 micron

polytetrafluouroethylene filter (Militec LCWP 047-00 or equivalent) and measure

filtrate volume.

h. Set filtrate aside for viscosity and acid number tests.

i. Remove all sludge from test equipment with rubber policeman, wash equipment and

filtered sludge with petroleum ether, oven dry sludge sample, and weigh and compute

sludge weight per 100 mL of oil.

j. Do not add the petroleum ether washings to the oil filtrate used for viscosity and acid number. Petroleum ether, with a boiling range of 30 to 60 °C, n-heptane, or hexane

shall be used in place of 1,1,1-trichloroethane (O-T-620).

4.4.13 Gear load carrying ability. The average of six determinations for STD, C/I, and HTS classes of oil shall be not less than 102 percent of the reference oil (Hercolube A, see 4.4.13.1) when tested in accordance with FED-STD-791, method 6508 and table II. The average of six determinations for EE class of oil shall not be less than 110 percent of the reference oil. All six determinations shall be made on the same machine. The reference oil average rating used to obtain the relative ratings shall also be reported. Only the Ryder gear machines having a reference oil average rating of 2,100-2,600 lb/in. after eight determinations are acceptable.

4.4.13.1 Source for standard reference oil for Ryder Gear Test (table II). Standard reference oil may be obtained from the Naval Air Systems Command, AIR 4.4.2.2, Propulsion Lubricants Team, 22229 Elmer Road, Building 2360, Unit 4, Patuxent River, MD 20670-1534.

4.4.14 Bearing deposits.

a.Post test oil viscosity sample is compared with viscosity of new oil samples tested at

40 °C. Post test oil total acid number is compared to the total acid number of the new oil

sample. The viscosity shall be determined in accordance with ASTM D445. The total

acid number shall be determined in accordance with SAE ARP5088.

4.4.14.1 Classes STD and C/I. The qualification sample will be evaluated in a 100 hour test in accordance with table II (FED-STD-791, Method 3410, severity level 1-1/2).

4.4.14.2 Classes HTS and EE. The qualification sample will be evaluated in a 200 hour test in accordance with table II (FED-STD-791, Method 3410, severity level 1-1/2).

4.4.15 Minisimulator test. The enhanced ester qualification sample after a 100-hour minisimulator test (SAE ARP6166) shall perform in accordance with table II.

a. Post test oil viscosity sample is compared with viscosity of new oil samples tested at

40 °C. Post test oil total acid number is compared to the total acid number of the new

oil sample. The viscosity shall be determined in accordance with ASTM D445. The

total acid number shall be determined in accordance with SAE ARP5088.

4.4.16 Bearing corrosion (class C/I only). The candidate oil shall successfully pass three series of bearing corrosion tests:

a. The first series of tests shall be conducted on the candidate oil as received (new oil)

with a minimum of 18 of 36 bearing raceways being free from corrosion;

b. The second series shall be conducted on the post-test filtrate from the 204 °C.

Corrosion and oxidation stability test (stressed oil) (see table I) with a minimum of

three of six bearing raceways being free from corrosion.

c. The third series shall be run on the used oil from the turboshaft engine test (see 4.4.17)

with a minimum of three of six bearing raceways being free from corrosion.

d. Any batch of bearing corrosion tests shall also include one pass and one fail reference

oil test bearing for quality control purposes.

4.4.17 Turboshaft engine. The oil shall be subjected to an accelerated endurance test in a turboshaft engine for a period sufficient to determine its performance characteristics. Engine components shall be inspected for defects upon completion of the endurance test run. Any defects found in the components of the engine which are serviced by the oil shall be cause for disqualification. Engine test conditions and test period shall be specified by the activity responsible for qualification (see 4.2).

4.4.18 Service evaluation. When candidate lubricants that were the result of unique or unusual formulation or manufacturing technologies are submitted for qualification testing, the qualification activity (see 4.2) may require additional engine and flight test evaluations. The additional evaluations shall be conducted by the qualifying activity, or its designated representative, and shall consist of the following:

a. Model type test. A 150-hour, test cell operated, evaluation shall be conducted on a

minimum of two different models of aviation gas turbine engines used by the U.S.

Military.

b. Flight evaluation. A 2000-hour flight evaluation shall be conducted in a Government

owned aircraft having the same engine model as used in the Model type test, above.

4.4.18.1 Evaluation criteria. The rating criteria for both the model type test and the flight evaluation will be reported as satisfactory or unsatisfactory. The satisfactory rating is contingent upon the successful completion of the test duration without a lubricant-related discrepancy and the satisfactory condition of the lubricant-wetted parts upon post-test engine disassembly and inspection. The post-test condition of the candidate lubricant shall be free of deleterious features.

4.4.19 Conformance inspection testing methods. The following information is in support of the conformance testing required in table III.

4.4.19.1 Bearing deposits conformance testing. The bearing deposit test (see table II) shall be performed on the first three full-scale production lots of each qualified lubricating oil supplied to the procuring activity.

4.4.19.2 Ryder gear load carrying capacity conformance testing. The Ryder Gear test (see table II) shall be performed on the first ten full-scale production lots of each newly qualified Class C/I and EE lubricating oil supplied to the procuring activity. Additional requirements for performing the Ryder Gear test on subsequent production batches may be specified in the procurement contracts. Additional load carrying test methods may be deemed suitable for qualification of management of change issues at the discretion of the qualifying activity. The products shall meet the conformance test requirements as stated in 4.4.19.2.1 and 4.4.19.2.2.

4.4.19.2.1 Class C/I products criteria. Class C/I products shall meet one of the following criteria:

a. greater than or equal to 112 percent of the Herco A reference fluid value if measured by

two determinations.

b. greater than or equal to 106 percent of the Herco A reference fluid value if measured by

four determinations.

c. greater than or equal to 102 percent of the Herco A reference fluid value if measured by

six determinations.

4.4.19.2.2 Class EE products criteria. Class EE products shall meet the following criteria:

a. greater than or equal to 110 percent of the Herco A reference fluid value as measured by

six determinations.

4.4.19.3 Bearing corrosion conformance inspection procedures. The bearing corrosion test shall be performed on all production batches of Class C/I lubricant supplied, except as noted in 4.4.19.3.1. Each production batch of the oil shall successfully pass one series of bearing corrosion tests (see table II) on the new oil. This series shall consist of nine candidate specimens and one each of the pass and fail reference oils (see 4.4.16).

4.4.19.3.1 Corrosion additive. Confirmation of the presence of the corrosion additive may be conducted using a quantitative laboratory analytical method of analysis approved by the qualifying activity. Confirmation of the specified additive package by such approved methods may be substituted for a bearing corrosion test to satisfy the quality conformance test requirement.