generally found wherever pockets of water exist in fuel tanks. It has a brown, black, or gray color, and a
stringy, fibrous-like appearance. FSII additive at 15 percent by volume is effective in controlling
microbial contamination. If water is absent, microbiological growth cannot occur.
PART C QUALITY SURVEILLANCE OF TESTING PROCEDURES
Fuels can be contaminated from time to time during the refining process. Particulate contaminant testing is
performed at various distribution locations to determine the effectiveness of fuel supply filtration systems. When
aviation fuel contains moderate to heavy sediment levels, the aircraft's fuel filter may clog and shut off the fuel
supply to the engine(s).
ASTM D-2276 Standard Test Method for Particulate Contamination in Aviation Turbine
Oven - static type
Petri dishes - approximately 125 mm in diameter with removable glass supports for membrane filters
Forceps - flat-bladed with unserrated, non-pointed tips
Test membrane filters, plain, 37-mm diameter, nominal pore size 0.8 micron
Control membrane filter (gridded control membrane filters may be used for purpose of identification)
Dispenser for flushing fluid with 0.4 micron membrane filters
Field monitor - complete with protective plugs and 34-mm support pads
Air ionizer - for the balance case
Selection and Preparation of Reagents.
Reagent grade chemicals shall be used in all tests. Unless otherwise indicated, it is intended that all
reagents shall conform to the specifications of the Committee on Analytical Reagents of the American
Chemical Society. Other grades may be used, provided it is ascertained that the reagent is of
sufficiently high purity to permit its use without lessening the accuracy of the determination.
Unless otherwise indicated, references to water shall be understood to mean reagent water as defined by
Type III of Specification D-1193.
Isopropyl alcohol. NOTE: Isopropyl alcohol is flammable.
Liquid detergent - water soluble.
Petroleum spirit (petroleum ether or IP petroleum spirit 40/60), boiling range 35 to 60 degrees Celsius.
Preparation of Test and Control Membrane Filters and Field Monitoring Prior to Sampling.
Two 37-mm membrane filters of nominal pore size 0.8-um are required: A test and a control membrane
filter. Matched-weight membrane filters may be used if so desired.
If matched-weight membrane filters are used, it is unnecessary to carry out the procedures detailed
below because they have been carried out previously by the membrane filter supplier. The two
membrane filters used for each individual test should be identified by marking the petri dishes used as
- Using forceps place the test and control membrane filters side by side in a clean petri dish. To
facilitate handling the membrane filters should rest on clean glass support rods in the petri dish.
- Place the petri dish with its lid slightly ajar, in an oven at 90+5 Celsius and leave it for 30 minutes.
- Remove the petri dish from the oven and place it near the balance. The petri dish cover should
be ajar but still protecting the membrane filters from contamination from the atmosphere. Allow 30
minutes for the membrane filters to come to equilibrium with the ambient air temperature and
- Remove the control membrane filter from the petri dish with forceps, handling by the edge only,
and place it centrally on the weighing pan. Weigh it and return it to the petri dish.