R  (3) Obey the fuel safety procedures when you do work on the fuel system 
R  (Ref. TASK 28-00-00-910-001). 
R  (4) Put warning notices in the cockpit to tell persons not to operate: 
R  - the aircraft engines 
R  - the flap/slat system 
R  - the fuel system. 
R  Subtask 28-11-00-860-101 
R  B. Aircraft Maintenance Configuration 
R  WARNING : MAKE SURE THAT ALL THE CIRCUITS IN MAINTENANCE ARE ISOLATED_______ 
R  BEFORE YOU SUPPLY ELECTRICAL POWER TO THE AIRCRAFT. 
R  (1) Energize the aircraft electrical circuits (Ref. TASK 24-41-00-861-
R  002). 
R  (2) Do the EIS start procedure (ECAM only) (Ref. TASK 31-60-00-860-001). 
R  (3) On panel 115VU, make sure that the ENG 1 and 2 switches are in the 
R  OFF position. 
R  Subtask 28-11-00-960-054 
R  C. Replace the Fuel Filter Elements 
R  (1) Replace the No. 1 and 2 engine fuel filter elements (Ref. TASK 73-11-
R  10-920-001). 
R  (2) Replace the APU fuel filter element: 
R  - for the 131-9(A) APU (Ref. TASK 49-32-41-920-001) 
R  - for the GTCP 36-300 APU (Ref. TASK 49-32-11-610-001) 
R  - for the APS 3200 APU (Ref. TASK 49-32-11-610-002). 
R  4. Procedure_________ 
R  Subtask 28-11-00-670-056 
R  A. Biocidal Shock Treatment for Moderate Contamination - With Fuel Mixed 
R  with Kathon Biocide 
R  (1) Drain the water from all of the fuel tanks (Ref. TASK 12-32-28-281-
R  001). 
R  (2) Defuel the aircraft (Ref. TASK 28-25-00-650-001).

R  (3) Drain the remaining fuel from all of the tanks (Ref. TASK 28-25-00-
R  650-003). 
R  (4) In not more than 10 days, refuel all the fuel tanks to the maximum 
R  capacity, with fuel mixed with MICROBIOLOGICAL CONTAMIN. PROTECT. 
R  MATERIALS (Material No. 17-003A), at a concentration of 100 ppm (by 
R  weight) (Ref. TASK 12-11-28-650-003). 
R  NOTE : AIRBUS recommends that you refuel the aircraft to the maximum____ 
R  capacity. If this is not done (for operational reasons) 
R  microbiological contamination can stay in the upper part of 
R  the tanks. 
R  Subtask 28-11-00-860-102 
R  B. Aircraft Maintenance Configuration 
R  (1) Do the EIS stop procedure (Ref. TASK 31-60-00-860-002). 
R  (2) De-energize the aircraft electrical circuits (Ref. TASK 24-41-00-862-
R  002). 
R  Subtask 28-11-00-670-057 
R  C. Fuel System Treatment 
R  (1) Let the fuel stay in the tanks for between 12 and 24 hours. 
R  NOTE : In a high ambient temperature, the soak time must be a minimum____ 
R  of 12 hours. In a low ambient temperature, the soak time must 
R  be a minimum of 24 hours. AIRBUS recommends that you always 
R  let the fuel stay in the tanks for 24 hours. 
R  (2) During the soak time: 
R  - do not move the aircraft 
R  - do not operate the fuel pumps or APU 
R  - do not do water drain tests, a high concentration of biocide will 
R  be in the sample. 
R  (3) After the soak time, the fuel and biocide is burned through the APU 
R  and engines during normal operations. 
R  NOTE : Obey the engine manufacturers restrictions and guidelines for____ 
R  your aircraft.

R  5. Close-up________ 
R  Subtask 28-11-00-942-110 
R  A. Removal of Equipment 
R  NOTE : For disposal of waste fuel, refer to the local regulations.____ 
R  (1) Make sure that the work area is clean and clear of tool(s) and other 
R  items. 
R  (2) Remove the warning notice(s). 
R  (3) Remove the ground support and maintenance equipment, the special and 
R  standard tools and all other items. 
R  (4) Remove the safety barriers. 
R  Subtask 28-11-00-960-055 
R  B. Replace the Fuel Filter Elements 
R  NOTE : The fuel filter elements must be replaced again after 50 to 75____ 
R  hours of operation. 
R  (1) Replace the No. 1 and 2 engine fuel filter elements again (after 50 
R  to 75 hours operation) (Ref. TASK 73-11-10-920-001). 
R  (2) Replace the APU fuel filter element again (after 50 to 75 hours 
　
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