Aug 01/05 CES
R TASK 28-12-00-810-803 R Fuel - Tank Venting, L(R) Surge Tank Overpressure Protector 46QM(47QM) Broken R WARNING : OBEY THE FUEL SAFETY PROCEDURES.
_______ R 1. Possible Causes
_______________
R - PROTECTOR-FUEL VENT, L NACA INTAKE (48QM)
R - PROTECTOR-FUEL VENT, R NACA INTAKE (49QM)
R - PROTECTOR-OVERPRESSURE, L VENT SURGE TK (46QM)
R - PROTECTOR-OVERPRESSURE, R VENT SURGE TK (47QM)
R - intake Assy, NACA vent
R - surge-tank vent-duct between Ribs 23 and 24.
R 2. Job Set-up Information
______________________
R A. Referenced Information
R -------------------------------------------------------------------------------R REFERENCE DESIGNATION R -------------------------------------------------------------------------------
R IPC 28-12-41-03 R AMM 28-12-00-200-001 R AMM 28-12-41-000-001 R AMM 28-12-41-200-003 R AMM 28-12-41-400-001 R R AMM 28-12-47-000-001 R AMM 28-12-47-400-001 Inspection of the Tank Venting System Removal of the Overpressure Protector 46QM (47QM) Inspection of the Overpressure Protector 46QM (47QM) Installation of the Overpressure Protector 46QM (47QM) Removal of the NACA Vent Intake Installation of the NACA Vent Intake
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 46QM(47QM) is to____
R protect the left(right) wing surge-tank structure from possible
R damage.
R The operation of the overpressure protector 46QM(47QM) will safely
R release the (unwanted) pressure directly to the atmosphere.
R The defects that follow (and/or) can cause the overpressure
R protector 46QM(47QM) break/operate:
R - the surge tank vent duct is blocked
R - the surge tank flame arrestor is blocked
R - the surge tank NACA intake is blocked.
R A blockage as given above/before can cause the overpressure
R protector to break/operate because the normal ventilation path was
R not able to release the unwanted pressure (quickly or
R sufficiently) safely to the atmosphere.
「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 ∞∞28-12-00∞∞∞∞∞∞∞∞∞∞Page 212
Aug 01/05 CESR (1) Do the Inspection of the Overpressure Protector 46QM(47QM) (Ref. AMM R TASK 28-12-41-200-003).
R (a) If the overpressure protector 46QM(47QM): R R - and the related items are as specified, no more troubleshooting R work steps are necessary R R - safety disc has operated (is broken or damaged), and/or the R related items are not as specified (example, corroded, wire R mesh damaged), do Para. 4.A.
R NOTE : The overpressure protector 46QM(47QM) is only included as
____
R a 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 46QM(47QM) 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 center tank and the adjacent left R wing tank was more than the correct safe operating pressure R (Ref. AMM 28-12-00 P.Block 001).
R (2) Do an Inspection of the Tank Venting System items that follow (Ref. R AMM TASK 28-12-00-200-001):
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