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 Subtask 73-11-10-220-050
 C. Identification of Various Types of Contamination R (1) Contamination by solids in small amounts (dirt, sand, metallic
R  particles or sealant particles): NOTE : This can be considered as normal contamination of the engine
____
 main fuel filter.

 (a) Replace the fuel filter element (Ref. TASK 73-11-10-000-004) and (Ref. TASK 73-11-10-400-004).
 (2) Contamination by solid in large amounts such as dirt, sand, metallic debris or sealant particles (no visible bronze particles)
 NOTE : Possible causes are contaminated fuel, contaminated aircraft
____ fuel tank(s), damaged aircraft boost pump, damaged engine LP stage fuel pump, foreign material, etc...
 (a) Replace the fuel filter element (Ref. TASK 73-11-10-000-004) and (Ref. TASK 73-11-10-400-004).

 (b) Do a check of the fuel filter element on the opposite engine.

 (c) Do a check of the aircraft fuel tanks and clean them (Ref. TASK 28-11-00-600-003) .

 (d) Install a new fuel filter element on both engines (Ref. TASK 73-11-10-400-004).

 1 If the ECAM warning "FUEL FILTER CLOG" did not come into view:
_ a After 24 hours in service, examine and replace the fuel
_ filter cartridge (Ref. TASK 73-11-10-000-004) and (Ref. TASK 73-11-10-400-004).
 2 If the ECAM warning "FUEL FILTER CLOG" came into view:
_ a Do a borescope inspection of the combustion chamber liners
_ and high pressure turbine nozzle vanes (Ref. TASK 72-41-00-290-001).
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 b Do a borescope inspection of the stage 1 LPT nozzle

_
 assembly (Ref. TASK 72-53-00-290-003). R R - If borescope findings are unserviceable, remove the R engine. R R - If borescope findings are within limits, repeat the R borescope inspection as above after 100 hours of engine
 operation. R R - If the borescope findings did not change since last R inspection, resume normal inspection schedule. R R - If the borescope findings are unserviceable, remove the R engine. R R - If the borescope findings show a deviation since last R inspection but are still within the limits:
 Replace all fuel nozzles (Ref. TASK 73-11-40-000-002) and
 (Ref. TASK 73-11-40-400-002).
 Replace the fuel nozzle manifold.
 Drain all disconnected fuel lines and blow dry air inside
 to remove any contaminant that could be left.

R 3_ After 24 hours in service, examine and replace the fuel filterR cartridge (Ref. TASK 73-11-10-000-004) and (Ref. TASK 73-11-10-400-004).
 (3) Contamination by black sludge or slimy materials:
 NOTE : This contamination can be due to fungus growth:
____
 (a) Replace the fuel filter cartridge (Ref. TASK 73-11-10-000-004) and (Ref. TASK 73-11-10-400-004).

 (b) Do a check of the fuel filter on the opposite engine.

 (c) Clean the aircraft fuel tanks, flush the fuel lines and do a biocidal shock treatment (Ref. TASK 28-11-00-600-003) and (Ref. TASK 28-11-00-600-004).

 (d) After 24 hours in service, examine and replace the fuel filter cartridge (Ref. TASK 73-11-10-000-004) and (Ref. TASK 73-11-10-400-004).

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 (4) Contamination by bronze particles: CAUTION : THIS KIND OF CONTAMINATION CAN POTENTIALLY PARTIALLY OR
_______ TOTALLY CLOG THE ENGINE FUEL NOZZLES THUS LEADING TO AN ABNORMAL FUEL SPRAY AND CONSEQUENTLY CAUSE EXTENSIVE ENGINE HARDWARE DAMAGE. THE FOLLOWING TROUBLE SHOOTING SHALL BE STRICTLY APPLIED TO AVOID FURTHER ENGINE DAMAGE.
 NOTE : Evidence of bronze particles in the main fuel filter is
____ indicative of a main fuel pump HP bearin failure.
 (a) Do a borescope inspection of the 1 LPT nozzle assembly (Ref. TASK 72-53-00-290-003).

 (b) Do a borescope inspection of the 2 lpt nozzle segments assembly (Ref. TASK 72-54-00-290-007).

 1 If the borescope inspection findings are unserviceable, remove
_
 the engine.

 2 If the results of the borescope inspection findings are in the
_ specified limits, replace the engine fuel system components which follow:
 NOTE : When components are disconnected, their tubes must be
____ fully drained and blown with dry air to remove any bronze particles left.
　
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