MIL-STD-1518E
distillation, vapor pressure, and freezing point.
5.4.2 Sampling requirements. In addition to submitting the sample addressed in 5.4.1, the contractor is responsible for performing all sampling and testing per TABLE I and TABLE III (if process is performed).
5.4.3 Sampling procedures. The validity of test results is greatly influenced by sampling procedures. The basic principle of any sampling procedure is to obtain a sample or composite of several samples in such a manner that the sample to be submitted for testing will be truly representative of the product. For sampling procedures, see the API Manual of Petroleum Measurement Standards, Chapter 8 or ASTM methods D4057, D4177, D5854 and T.O. 42B-1-1.
5.4.4 Sample size. In general, all samples of aircraft reciprocating engine fuels and jet engine fuels will be a minimum quantity of one gallon. Samples of engine lubricating oils and other liquid petroleum products will be a minimum quantity of one gallon. Grease samples will be five pounds in size and should be submitted in original package, if possible. Sample quantities larger than those mentioned are not necessary, but are acceptable.
5.4.5 Questionable quality products. Samples will be submitted to an Aerospace Fuels Laboratory any time doubt exists as to the quality or identity of petroleum products in storage or use. These samples will be authorized by the Quality Assurance Representative with fuel surveillance responsibility at that facility.
5.4.6 Disposal of samples. Unused portions of fuel samples must be accumulated in an
approved container, such as a metal drum. The container shall be appropriately labeled, segregated from other lab products, and kept away from sources of ignition. Return unused portions of fuel samples to storage or dispose of them in accordance with the installation recoverable and waste petroleum products management program. Every effort will be made to use this product for its original purpose. Fuel
samples containing petroleum ether used for rinse purposes should not be considered as waste fuel. This product should be returned to storage unless otherwise contaminated.
5.4.7 Aircraft defueling. Before starting the defuel operation, determine the type of fuel contained in the aircraft. Aircraft sumps shall then be drained to discard water and excess sediment. Defueled product should be returned to the aircraft if there is no reason to suspect contamination. Fuel returned to the same aircraft must pass through a filter separator. See 5.4.8 for fuel to be used in other aircraft. If
fuel cannot be returned to the aircraft, follow the defuel/servicing clause in the contract.
5.4.8 Fuel serviced to aircraft from defueled inventory. Aviation turbine fuel N.O.S. (see 3.6.6) and fuel defueled from aircraft but dispensed to other aircraft must meet the minimum quality criteria in TABLE III. It must pass through two filter separators from storage to aircraft. Defueled commingled product meeting the requirements of Table III shall not be serviced to aircraft which require JP-5 when the
flash point is below 60°C (140°F).
5.4.9 Change of product grade. In the event of a product change from jet fuel to aviation gasoline or vice-versa, contact the applicable Service Control Point (SCP) for instructions.
5.4.9.1 Controls and marking. Change the servicing controls and the unit markings as necessary to reflect the grade of fuel.
5.4.10 Records and quality checks required.
a. Tank cleaning (see 5.1.4).
b. Filter element replacement (see 5.1.6.1).
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