R TASK 28-12-00-810-805

R Fuel - Tank Venting, L(R) Wing Tank (Inner Cell) Overpressure Protector Broken R (Not Coded With FIN) Installed on the Access Panel 540HB(640HB), Type 25A
R WARNING : OBEY THE FUEL SAFETY PROCEDURES.
_______
R CAUTION : DO NOT LET THE REFUEL PRESSURE BE MORE THAN THE MAXIMUM SAFE PRESSURE
_______ R OF 50psi (3.45bar).
R 1. Possible Causes
_______________
R - VALVE-REFUEL, L WING TK (7QU)
R - VALVE-REFUEL, R WING TK (8QU)
R - VALVE-FLOAT VENT, L WING TK INR (16QM)
R - VALVE-FLOAT VENT, R WING TK INR (17QM)
R - the refuel supply pressure is above the safe limit
R - L(R) wing-tank vent-pipe/duct
R - L(R) wing-tank (inner-cell) overpressure protector

R 2. Job Set-up Information

______________________
R A. Referenced Information
R -------------------------------------------------------------------------------R REFERENCE DESIGNATION R -------------------------------------------------------------------------------
R  AMM  28-12-00-200-001  Inspection of the Tank Venting System 
R  AMM  28-12-43-000-002  Removal of the Vent Float-Valve 16QM (17QM) 
R  AMM  28-12-43-400-002  Installation of the Vent Float-Valve 16QM (17QM) 
R  AMM  28-12-46-000-001  Removal of the Overpressure-Protector Outlet 
R  AMM  28-12-46-200-001  Inspection of the Wing-Tank Overpressure Protector 
R  Outlet 
R  AMM  28-12-46-400-001  Installation of the Overpressure-Protector Outlet 
R  AMM  28-25-00-710-003  Operational Test of the Refuel System 
R  AMM  28-25-51-000-001  Removal of the Refuel Valve 7QU, (8QU) 
R  AMM  28-25-51-400-001  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  inner-cell access-panel/door (type 25A) between Ribs 13 and 14) is 
R  to protect the L(R) wing-tank inner-cell structure from possible 
R  damage. 
R  The operation of this overpressure protector will safely release 
R  the (unwanted) pressure to the atmosphere. 
R  The defects that follow (and/or) can cause the over pressure 
R  protector to break/operate:

 「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 : 001-049, 051-099, 101-149, 151-199, ∞∞28-12-00∞∞∞∞∞∞∞∞∞∞Page 219
 201-299, 401-499, Aug 01/05 CES

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 16QM(17QM) cannot open (or sufficiently) to R 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 (inner-cell) and the
R outside atmospheric pressure was more than the correct safe
R operating pressure (Ref. AMM 28-12-00 P.Block 001).
　
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