According to AMC E 670, what quantity of carbon fiber rods should be used per 1000 liters in fuel contamination testing for aircraft with carbon fiber composite fuel tanks?

0.54 g/1000 litre of carbon fiber rods should be used.

How should a complete fuel system be tested for solid contaminants per AMC E 670?

A test should be carried out on a running engine or rig, using fuel continuously contaminated at a rate of 4.5 g of contaminant per 4,500 liters.

What specific contaminant is relevant for engines fitted to aircraft with carbon fiber composite material fuel tanks, according to AMC E 670?

Carbon fibre rods of tensile strength 5.59 GPa nominal, with specific dimensions and population distribution, are relevant for engines fitted to aircraft with carbon fibre composite material fuel tanks.

What is the procedure for water contaminant testing in engine fuel systems according to AMC E 670?

The fuel system should be tested using fuel contaminated with water. The contaminated fuel should consist of fuel initially saturated with water at 27°C, with an additional 0.2 ml of free water per liter of fuel evenly dispersed. The test should be conducted with the mixture cooled to the most critical icing condition.

What are the acceptable solid contaminant characteristics for engine fuel testing according to AMC E 670?

Acceptable solid contaminants include various particle sizes and quantities of Ferroso-Ferric Iron oxide, Crushed quartz, Prepared dirt conforming to ISO 12103-1 A4, Cotton linters, Crude Napthenic Acid, and Salt water, as detailed in the provided table.

AMC E 670 Contaminated Fuel Testing

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ED Decision 2018/014/R

(1) Solid Contaminants

(a) A contaminant with the characteristics detailed in the following table is acceptable.

CONTAMINANT	PARTICLE SIZE	QUANTITY
FERROSO – FERRIC Iron oxide (Fe₃0₄) Magnetite (Black) FERRIC iron oxide (Fe₂0₃) Hematite FERRIC iron oxide (Fe₂0₃) Hematite	0 - 5 microns 0 - 5 microns 5 - 10 microns	0.40 g/1000 litre 7.13 g/1000 litre 0.40 g/1000 litre
Crushed quartz Crushed quartz Crushed quartz Crushed quartz	1000 – 1500 microns 420 – 1000 microns 300 – 420 microns 150 – 300 microns	0.07 g/1000 litre 0.46 g/1000 litre 0.26 g/1000 litre 0.26 g/1000 litre
Prepared dirt conforming to ISO 12103-1 A4 (Arizona test dust – coarse)	Mixture as follows: 0 - 5 microns (9.25%) 5 - 10 microns (10.25%) 10 - 20 microns (14.5%) 20 - 40 microns (25%) 40 - 80 microns (29.5%) 80 - 200 microns (11.5%)	2.11 g/1000 litre
Cotton linters	Below 7 staple (US Dept of Agriculture Grading Standards SRA-AMS 180 and 251)	0.03 g/1000 litre
Crude Napthenic Acid		0.03 percent by volume
Salt water prepared by dissolving salt in distilled water or other water containing not more than 200 parts per million of total solids	4 parts by weight of NaC1 96 parts by weight of H₂ 0	0.01 percent by volume

Additionally, for engines to be fitted to Aircraft with Carbon Fibre Composite Material Fuel Tanks:

Carbon fibre rods of tensile strength 5.59 GPa nominal.

5 microns nominal diameter

0 to 2000 microns in length

Population distribution:

0 - 25 microns (43% ± 5%)

25 - 50 microns (25% ± 5%)

50 - 75 microns (13% ± 5%)

75 - 125 microns (12% ± 5%)

>125 microns (7% ± 5%)

Maximum fibre length

2000 microns

0.54 g/1000 litre

(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), 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).

[Amdt. No.: E/1]

[Amdt No: E/5]

Details

Source-Title: AMC E 670 Contaminated Fuel Testing

Erulesid: ERULES-1963177438-11546 Compare versions

Domain: Initial airworthiness

Amendedby: Amendment 5

Applicabilitydate: 15 December, 2018

Entryintoforcedate: 15 December, 2018

Regulatorysource: ED Decision 2018/014/R Navigate

Regulatorysubject: CS-E

Typeofcontent: AMC to CS (Acceptable means of compliance to certification specification)

Parentir: CS-E 670 Contaminated Fuel

Origin: EASA

Category: EAR