MIL-PRF-87257 Hydraulic Fluid, Fire Resistant; Low Temperature, Synthetic Hydrocarbon Base, Aircraft And MissileThis specification describes the characteristics and provides the requirements for a synthetic hydrocarbon base hydraulic fluid for use in the -54??C to +200??C temperature range in aircraft and missile hydraulic systems. This hydraulic fluid is identified by NATO Code No. H-538 \(see 6.5\).

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MIL-PRF-87257B

VERIFICATION

4.1

Classification of inspection

Qualification inspection (see 4.2).

Conformance inspection (see 4.3).

4.2

Qualification inspection

4.2.1 Qualification inspection sample

Qualification samples shall consist of a 1-gallon container of hydraulic fluid. The following may

also be requested at the option of the qualifying agent: 1 quart of the base stock before addition

of additive agents, 1 ounce red dye, 1 quart of blending fluid, 4 ounces anti-wear agent, 1 ounce

of any other additive used in the formulation. In the event additives are supplied as

concentrated solutions, an equivalent quantity of the solution shall be furnished. The qualifying

activity will request data as noted in 6.3.2 to accompany the qualification samples.

4.2.2 Qualification tests

Qualification sample(s) shall be subjected to all the tests specified in section 4.4 and table I

except particulate contamination.

4.2.3 Retention of qualification

In order to retain qualification of a product approved for listing on the Qualified Products List

(QPL), the manufacturer shall verify, by certification to the qualifying activity, that the

manufacturer's product complies with the requirements of this specification. The time of

periodic verification by certification shall be in two-year intervals from the date of original

qualification. The Government reserves the right to re-examine the qualified product whenever

deemed necessary to determine that the product continues to meet any or all of the

specification requirements. Requalification is required every five years.

4.3 Conformance inspection

Conformance inspection shall consist of testing the sample against all requirements specified in

table III. In the event of a particulate contamination count failure, the referee method shall be

the microscopic method detailed in ASTM F 312. Samples shall be labeled completely with

information identifying the purposes of the sample, name of product, specification number, lot

and batch number, date of manufacture, date of sampling, and contract number.