R 2. Job Set-up Information
______________________
R A. Referenced Information
R -------------------------------------------------------------------------------R REFERENCE DESIGNATION R -------------------------------------------------------------------------------
R AMM 28-12-00-200-001 R AMM 28-12-43-000-003 R AMM 28-12-43-400-003 R AMM 28-12-46-000-001 R AMM 28-12-46-200-001 R R AMM 28-12-46-400-001 R AMM 28-25-00-710-003 R AMM 28-25-51-000-001 R AMM 28-25-51-400-001 Inspection of the Tank Venting System Removal of the Float Vent Valve 212QM(213QM) Installation of the Float Vent Valve 212QM(213QM) Removal of the Overpressure-Protector Outlet Inspection of the Wing-Tank Overpressure Protector Outlet Installation of the Overpressure-Protector Outlet Operational Test of the Refuel System Removal of the Refuel Valve 7QU, (8QU) Installation of the Refuel Valve 7QU, (8QU)
R AMM 28-12-00 P.Block 001 TANK VENTING SYSTEM
R 3. Fault Confirmation
__________________
R A. Test
R NOTE : The function of the overpressure protector (located at the
____ R access-panel/door (type 27B) between Ribs 19 and 20) is to protect R the L(R) wing-tank structure from possible damage. R The operation of this overpressure protector will safely release R the (unwanted) pressure to the atmosphere.
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R The defects that follow (and/or) can cause the overpressure R protector to break/operate: R - the refuel supply pressure is above the safe limit R - the L(R) wing-tank vent pipe/duct is blocked R - the float vent valve 212QM(213QM) cannot open (or sufficiently) R to release the (unwanted) pressure R - the related L(R) wing-tank refuel valve 7QU(8QU) does not close R correctly.
R (1) Do the Inspection of the Wing-Tank Overpressure Protector Outlet R (Ref. AMM TASK 28-12-46-200-001).
R (a) If the overpressure protector outlet: R R - and the related items are as specified, no more troubleshooting R work steps are necessary R R - is found to be serviceable but the related items are not as R specified (example, corroded, wire mesh damaged), make them R good before you do the close-up R R - safety disc has operated (is broken or damaged), do Para. 4.A.
R NOTE : The overpressure protector outlet is only included as a
____
R Possible Cause in this TSM procedure.
R 4. Fault Isolation_______________
R A. Procedure
R NOTE : Read all of the steps in this paragraph before you start work.
____
R The order in which the work steps are done is best decided by the
R maintenance staff together with:
R - other malfunction indications
R - the fuel configuration
R - the aircraft location.
R (1) If the (frangible) overpressure protector outlet has operated (is R broken), it is important to do all the steps that follow to find what R caused it to break.
R NOTE : The reasons why a burst disc can break are as follows:
____
R
R - a defective/unserviceable disk (non standard)
R that breaks below the (its) correct operating pressure
R
R - a serviceable disk that operated because the pressure
R difference between the wing-tank and the outside atmospheric
R pressure was more than the correct safe operating pressure
R (Ref. AMM 28-12-00 P.Block 001).
「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 : 301-399, ∞∞28-12-00∞∞∞∞∞∞∞∞∞∞Page 224
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R (2) Do a check of the applicable fuel tanker or fuel hydrant hose end
R pressure.
R (a) If the fuel pressure is more than 50psi (3.45bar):
R
R - change the fuel pressure if possible or
R
R - get another source of fuel supplied at the correct pressure.
R NOTE : If the fuel tanker or fuel hydrant hose end pressure is____
R more than the maximum safe pressure it can cause:
R - a refuel valve that has been commanded to shut, to stay
R open
R - a overpressure protector (burst disc) to operate
R - damage to the refuel gallery.
R (3) Do a check of the related L(R) wing-tank refuel valve 7QU(8QU) as
R follows:
R (a) Remove the applicable refuel valve 7QU(8QU) (Ref. AMM TASK 28-25-
R 51-000-001).
R (b) Do a visual inspection of the refuel valve 7QU(8QU), valve
R position.
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