(a) The Refuel/Defuel: 1 Fully defuel the aircraft (Ref. AMM TASK 28-25-00-650-001) and
_ (Ref. AMM TASK 28-25-00-650-003).
 2 Refuel the aircraft (Ref. AMM TASK 12-11-28-650-003) or (Ref.
_
 AMM TASK 12-11-28-650-004).

 3 Make a record of the fuel load put on the aircraft as shown by
_
 the tanker or fuel hydrant.

 (b) Manual Magnetic Indicators (MMIs): 1 Use the MMI secondary direct-reading system (Ref. AMM 28-43-

_ 00) to calculate the FOB when the aircraft is on the ground (Ref. AMM TASK 12-11-28-650-007).

 (c) Compare the FOB values obtained from the FQIS and defuel/refuel, or MMIs.

 (d) Troubleshoot if necessary: 1 Refer to the Fault Symptoms, at the front of the TSM and/or

_ chapter 28, for the related Task number.
 2 Do the applicable trouble shooting procedure related to the
_ observation or failure message.
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞28-11-00∞∞∞∞∞∞∞∞∞∞Page 207
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 (3) Fuel Used (FU) The FU data is supplied from each engines FADEC system. The source of the data is a fuel flow sensor/transmitter mounted on each engine.
 (a) Examine the PFR/CFDS(ENG) for a related flow sensor problem or message:
 1 If a flow sensor problem or message is shown:
_ a Refer to the Fault Symptoms, at the front of the TSM and/or

_ chapter 28, for the related Task number.
 b Do the applicable trouble shooting procedure related to the
_ observation or failure message.
 2 If there is no fuel flow sensor problem or message shown, do
_
 the next step.

 (4) Only continue with this procedure if you are sure that the FOB and FU values, at the time of the event, were correct.
 - if no data is available as to the location of the fuel leakage, do all of Para. 4.A.

 - if the leakage is reported to come from a fuel tank, go to Para. 4.A., step (4)

 - if the leakage is reported to come from an engine fuel supply pipe-line, go to Para. 4.A., step (5)

 - if the leakage is reported to come from an engine/IDG cooling return (to tank) fuel pipe-line, go to Para. 4.A., step (6).

 NOTE : This procedure is not a full list of all items/LRUs that can
____ possibly leak (possible causes). It is only a guide to logical Trouble-shooting to find the source of the leak.
 4. Fault Isolation
_______________
 A. Procedure
 WARNING : OBEY THE FUEL SAFETY PROCEDURES.
_______

 (1) Do a visual check, for a (obvious) fuel leak, at:
 - the lower surface of the aircraft wings

 - the engine pylons and the overboard drains at the aft fairings

 - the engine nacelles

 - the fuselage adjacent to and below the wing box/center tank area

 - the main landing gear bays

 - the aircraft drain mast

 - the hardstanding.

 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞28-11-00∞∞∞∞∞∞∞∞∞∞Page 208
 Aug 01/05R CES

 NOTE : The fuel leakage can be caused by incorrect assembly, damage,
____ the natural deterioration of fuel sealant, or an unserviceable seal.
 - if you can see a large fuel leakage, do step (2) and then (3)

 - if you can see a small fuel leakage (seepage) or no fuel leakage, do step (3).

 (2) If you can see a large fuel leakage:
 (a) Put a container (example, barrel - 42 gal.) under the aircraft at the position where the fuel comes from (example, the drain mast).

 (b) Defuel the applicable/adjacent fuel tank, or if necessary, defuel the aircraft (all tanks) (Ref. AMM TASK 28-25-00-650-001).

 (c) In accordance with the local regulations: 1 Remove all the spilt fuel.

_
 2 Clean the fuel spillage from the aircraft.

_
 3 Clean the fuel spillage from the area on the ground (hard

_
 standing).

 (3) If you can see a small fuel leakage:

 (a) If the leak is found from:

 - the aircraft's drain mast, do the TSM procedure (Ref. TASK 28-13-00-810-801)

 - the pylon drains at the aft fairings, do step (5) and (6).

 - the aircraft's main fuel tanks, do step (4).

 (b) If a leak is not found, do step (7).

 (4) Do the fuel tank leak checks and repair as necessary (Ref. AMM TASK 28-11-00-280-002).

 (a) Do a manual refuel of the applicable tank when the repair is complete (Ref. AMM TASK 12-11-28-650-004).
　
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