AMC E 670 Contaminated Fuel Testing

• ED Decision 2018/014/R found in: CS-E Amdt 5 - Engines (Dec 2018)

AMC E 670 Contaminated Fuel Testing ED Decision 2018/014/R (1) Solid Contaminants (a) A contaminant with the characteristics detailed in the following table is acceptable. <table border="1" cellpadding="0" cellspacing="0" width="531"><thead><tr><td valign="top" width="208"><p><b>CONTAMINANT </b></p></td><td valign="top" width="162"><p><b>PARTICLE SIZE </b></p></td><td valign="top" width="161"><p><b>QUANTITY </b></p></td></tr></thead><tr><td valign="top" width="208"><p>FERROSO – FERRIC</p><p>Iron oxide (Fe₃0₄) Magnetite (Black)</p><p>FERRIC iron oxide (Fe₂0₃) Hematite</p><p>FERRIC iron oxide (Fe₂0₃) Hematite</p></td><td valign="top" width="162"><p>0 - 5 microns</p><p>0 - 5 microns </p><p>5 - 10 microns </p></td><td valign="top" width="161"><p>0.40 g/1000 litre </p><p>7.13 g/1000 litre</p><p>0.40 g/1000 litre</p></td></tr><tr><td valign="top" width="208"><p>Crushed quartz</p><p>Crushed quartz</p><p>Crushed quartz</p><p>Crushed quartz</p></td><td valign="top" width="162"><p>1000 – 1500 microns </p><p>420 – 1000 microns </p><p>300 – 420 microns </p><p>150 – 300 microns </p></td><td valign="top" width="161"><p>0.07 g/1000 litre </p><p>0.46 g/1000 litre </p><p>0.26 g/1000 litre </p><p>0.26 g/1000 litre </p></td></tr><tr><td valign="top" width="208"><p>Prepared dirt conforming to ISO 12103-1 A4 (Arizona test dust – coarse)</p></td><td valign="top" width="162"><p>Mixture as follows: </p><p>0 - 5 microns (9.25%) </p><p>5 - 10 microns (10.25%) </p><p>10 - 20 microns (14.5%) </p><p>20 - 40 microns (25%) </p><p>40 - 80 microns (29.5%) </p><p>80 - 200 microns (11.5%) </p></td><td valign="top" width="161"><p>2.11 g/1000 litre </p></td></tr><tr><td valign="top" width="208"><p>Cotton linters </p></td><td valign="top" width="162"><p>Below 7 staple (US Dept of Agriculture Grading Standards SRA-AMS 180 and 251) </p></td><td valign="top" width="161"><p>0.03 g/1000 litre </p></td></tr><tr><td valign="top" width="208"><p>Crude Napthenic Acid </p></td><td valign="top" width="161"><p>0.03 percent by volume </p></td></tr><tr><td valign="top" width="208"><p>Salt water prepared by dissolving salt in distilled water or other water containing not more than 200 parts per million of total solids </p></td><td valign="top" width="162"><p>4 parts by weight of NaC1</p><p>96 parts by weight of H₂ 0 </p></td><td valign="top" width="161"><p>0.01 percent by volume </p></td></tr></table> Additionally, for engines to be fitted to Aircraft with Carbon Fibre Composite Material Fuel Tanks: <table border="1" cellpadding="0" cellspacing="0" width="532"><tr><td valign="top" width="207"><p>Carbon fibre rods of tensile strength 5.59 GPa nominal. </p></td><td valign="top" width="169"><p>5 microns nominal diameter</p><p>0 to 2000 microns in length</p><p>Population distribution:</p><p>0 - 25 microns (43% ± 5%) </p><p>25 - 50 microns (25% ± 5%) </p><p>50 - 75 microns (13% ± 5%) </p><p>75 - 125 microns (12% ± 5%) </p><p>&gt;125 microns (7% ± 5%)</p><p>Maximum fibre length </p><p>2000 microns </p></td><td valign="top" width="156"><p>0.54 g/1000 litre </p></td></tr></table> (b) A test on the complete fuel system should be carried out either on a running Engine, or on a rig, using fuel continuously contaminated at a rate of 4.5 g of contaminant per 4 500 litres. (c) The point at which impending filter blockage will be indicated to the flight crew should also be established and the fuel system should be shown to be capable of continuing to operate without causing Engine malfunction for a further period equal to at least half the maximum flight duration of the aircraft in which it is likely to be installed. Once this has been established, it is permissible to clean or replace filter(s) as frequently as necessary for the remainder of the test. If blockage has not occurred by the time the total quantity of contaminant has reached the level specified in paragraph (d) below, the objective of this paragraph (c) may be considered to have been met. (d) The test should then be continued at typical running conditions with respect to Rotational Speeds, pressures, fuel flow, etc., for a sufficient time to ensure that the total weight of contaminant passing into the system would be equivalent to 500 hours of normal operation with fuel contaminated to a level of 0.5 g per 4 500 litres. At the conclusion of the test, the fuel system should be functioning satisfactorily. (2) Water Contaminant A test on the fuel system should be carried out, using the fuel contaminated with water, either on a running Engine or on a rig. The contaminated fuel should consist of fuel initially saturated with water at a fuel/water temperature of 27°C into which a further 0.2 ml of free water per litre of fuel has been evenly dispersed. The test should be conducted with the contaminated mixture cooled to the most critical condition for icing likely to be encountered in operation. (3) Transient Fuel Icing Conditions In compliance with [CS-E 670(a)](#_DxCrossRefBm1371447606), the applicant should consider the effect on Engine operability of the transient fuel icing conditions likely to be encountered in service in accordance with [AMC E 560(4)](#_DxCrossRefBm1371447745). [Amdt. No.: E/1] [Amdt No: E/5]