2 Replace the fuel pump and filter assembly (Ref. TASK 73-11-10-
_ 000-003) and (Ref. TASK 73-11-10-400-003) with a new fuel filter cartridge.
3 Replace the fuel flow transmitter (Ref. TASK 73-31-10-000-002)
_
and (Ref. TASK 73-31-10-400-002).
4 Replace the servo-fuel heater (Ref. TASK 73-11-20-000-002) and
_
(Ref. TASK 73-11-20-400-002).
5 Replace the main oil/fuel heat exchanger (Ref. TASK 79-21-20-
_ 000-002) and (Ref. TASK 79-21-20-400-002).
6 Replace the IDG oil cooler (Ref. TASK 73-11-60-000-002) and
_
(Ref. TASK 73-11-60-400-002).
7 Replace the fuel return valve (Ref. TASK 73-11-50-000-002) and
_
(Ref. TASK 73-11-50-400-002).
8 Replace the downstream fuel filter (Ref. TASK 73-11-45-000-
_
040) and (Ref. TASK 73-11-45-400-040).
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Subtask 73-11-10-220-050-B
C. Identification of Various Types of Contamination
(1) Contamination by solids in small amounts (dirt, sand, metallic 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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E 56-5B E E E b Do a borescope inspection of the stage 1 LPT nozzle
_ assembly (Ref. TASK 72-53-00-290-003).
- If borescope findings are unserviceable, remove the engine.
- If borescope findings are within limits, repeat the borescope inspection as above after 100 hours of engine operation.
- If the borescope findings did not change since last
inspection, resume normal inspection schedule.
- If the borescope findings are unserviceable, remove the
engine.
- If the borescope findings show a deviation since last
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.
3 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).
(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). 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320飞机维护手册 AMM 发动机燃油和控制 ENGINE FUEL AND CONTRO(41)
