R **ON A/C 301-399,
R (Ref. Fig. 001A, 002A)
R -------------------------------------------------------------------------------R FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA R | | | | DOOR | REF. R -------------------------------------------------------------------------------R 48QM PROTECTOR-FUEL VENT, L NACA INTAKE 550 550AB 28-10-00 R 49QM PROTECTOR-FUEL VENT, R NACA INTAKE 650 650AB 28-10-00 R 46QM PROTECTOR-OVERPRESSURE, L VENT SURGE 550 550CB 28-12-41 R TK R 47QM PROTECTOR-OVERPRESSURE, R VENT SURGE 650 650CB 28-12-41 R TK R 96QM PROTECTOR-OVERPRESSURE, CTR TK 141 147AZ 28-20-00 R 212QM VALVE-FLOAT VENT, LEFT WING 540 540RB 28-12-43 R 213QM VALVE-FLOAT VENT, RIGHT WING 640 640RB 28-12-43 R 50QM CHECK VALVE-FUEL DRAIN, L WING TK 540 540AB 28-12-44 R INR FWD R 51QM CHECK VALVE-FUEL DRAIN, R WING TK 640 640AB 28-12-44 R INR FWD R 120QM CHECK VALVE-FUEL DRAIN, L WING TK 540 540AB 28-12-44 R INR REAR R 121QM CHECK VALVE-FUEL DRAIN, R WING TK 640 640AB 28-12-44 R INR REAR R 93QM CHECK VALVE-FUEL DRAIN, CTR TK 141 147AZ 28-20-00 R 214QM CLACK VALVE 540 540RB 28-11-42 R 215QM CLACK VALVE 640 640RB 28-11-42 R 216QM CLACK VALVE 540 540RB 28-11-42 R 217QM CLACK VALVE 640 540RB 28-11-42
1EFF : ALL 1 28-12-00Page 5 1 1 May 01/04 1 1 1CES 1
R Vent Surge Tank
R Figure 002A
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**ON A/C ALL
3. System Description
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The tank venting system lets the air in or out of the fuel tanks as necessary. This function lets the fuel storage and the fuel distribution systems operate correctly.
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
The fuel tank venting system has these components:
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the vent protector (flame arrestor) 48QM(49QM)
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the surge-tank overpressure protector 46QM(47QM)
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the wing tank overpressure protector 102QM(103QM)
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the center tank overpressure protector 96QM
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the wing tank vent float valve 15QM(18QM), 16QM(17QM)
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the check valves 50QM(51QM), 52QM(53QM), 93QM, 120QM(121QM).
**ON A/C 301-399,
The fuel tank venting system has these components:
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the vent protector (flame arrestor) 48QM(49QM)
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the surge-tank overpressure protector 46QM(47QM)
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the wing tank overpressure protector
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the center (transfer) tank overpressure protector 96QM
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the wing tank vent float valve 212QM(213QM)
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the check valves 50QM(51QM), 120QM(121QM)
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the clack valves 214QM(215QM), 216QM(217QM).
**ON A/C ALL
The LH(RH) wing has a vent surge tank (surge tank) between the RIB22 and the RIB26. The vent surge tank is open to the external air through a stack pipe which is connected to a NACA duct. The NACA duct is on the access panel 550AB(650AB) in the bottom of the vent surge tank. The vent surge tank lets the air flow through it in each direction. It is also a temporary reservoir for the fuel that can come into it from the vent pipes. The vent surge tanks have a capacity (before fuel can flow overboard) of 190 liters (50 U.S. gal).
The vent protector 48QM(49QM) is installed in the stack pipe. If a ground fire occurs, it prevents the ignition of the fuel vapour in the surge tank
1EFF : ALL 1 28-12-00Page 7 1 1 Aug 01/05 1 1 1CES 1 (and thus the tank venting-system). It also lets the air flow freely through it in two directions, and prevents ice formation.
If a failure occurs in the fuel system (which causes large quantities of fuel to enter the surge tank), then the vent protector lets the fuel flow freely overboard.
The overpressure protector 46QM(47QM) in the vent surge tank makes sure the pressure in the vent surge tank is not more than the specified limit. If the flow of air into (or out of) the surge tank is blocked, the overpressure protector breaks to release the pressure. If fuel enters the vent surge tank and causes the overpressure protector to break, then this fuel will go overboard. The overpressure protector is on the access panel 550CB(650CB).
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
During flight, fuel can collect in the vent surge tank. If this occurs, a jet pump (Ref. 28-21-00) moves the fuel into the related wing tank outer cell. Each wing tank and the center tank has a vent system. The vent pipes in the LH wing tank and the center tank connect to the LH vent surge tank through the LH stringer vent duct. The vent pipes in the RH wing tank connect to the RH vent surge tank through the RH stringer vent duct.
The vent for the LH(RH) inner cell between RIB2 and RIB3 is a 63.5 mm (2.5in.) dia. pipe. One end of the pipe is open and turned to face the upper wing at the highest point adjacent to RIB2/front spar. The other end of the vent pipe is connected to the stringer vent duct outboard of RIB2.
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