-
the fuel pump pressure switches 23QA(24QA), 27QA(28QA).
 When it is in operation, each main pump supplies the fuel to:

 -its related engine
 -
the recirculation cooling system (Ref. 28-16-00)

 -
the crossfeed system (Ref. 28-23-00)

 -
the refuel/defuel system (Ref. 28-25-00) (for pressure defuel)

 -
the main transfer system (Ref. 28-26-00).

 1EFF : ALL 1 28-21-00Page 11 1 1 Aug 01/05 1 1 1CES 1

 **ON A/C ALL

 Each wing tank has a closed area which is a collector cell. The collector cell is made between RIB1 and RIB2, the front and the rear spars and the top and bottom skins. Clack valves, in the bottom of RIB2, let the fuel go into the collector cells but do not let the fuel go out. The collector cells make sure that the main pumps are always fully in fuel during all flight manoeuvres. In the collector cells are:
 -
two fuel pump canisters and their related fuel pump elements (which together make the main pumps)

 -
two fuel strainers

 -a suction valve
 -two check valves.

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 The canisters 1QM(3QM) 2QM(4QM) are attached to the wing bottom skin and fully contain the fuel pump element. Each canister has:
 -
an upper outlet that connects to the engine feed line

 -
an upper outlet that connects to a sequence valve

 -
a (smaller) outlet that connects to the scavenge jet pumps 66QM(69QM), 67QM(68QM) and the fuel pump pressure switches 23QA(28QA), 27QA(24QA)

 -
a vent valve installed on the top of the canister

 -
a lower inlet that connects to the fuel strainers 6QM(8QM), 5QM(7QM).
 The engine feed outlet from each canister has an internal check valve.
 The check valves 33QM(36QM), 34QM(35QM) are in the line to the scavenge jet
 pumps.
 The vent valve is installed in a flametrap at the top of the canister. Gas
 or air that is removed from the fuel by the pump, is sent back to the fuel
 tank through the vent valve. The valve prevents fuel flow in the opposite
 direction and is opened by a probe in the related fuel pump.
 When the fuel pump is not in operation the check valves prevent a flow of
 fuel back through the pump.

 **ON A/C 301-399,
 The canisters 1QM(3QM) 2QM(4QM) are attached to the wing bottom skin and fully contain the fuel pump element. Each canister has two (upper) outlets that connect to:
 -
the engine feed line

 -
the transfer system (Ref. 28-26-00)

 -two (smaller) outlets that connect to the recirculation system (Ref. 28-16-00) and the fuel pump pressure switches 23QA(24QA), 27QA(28QA)
 -a vent valve installed on the top of the canister.
 1EFF : ALL 1 28-21-00Page 12 1 1 Aug 01/05 1 1 1CES 1 The engine feed outlet from each canister has an internal check valve. The check valves 149QM(151QM), 150QM(152QM) are installed in the transfer system outlet. The vent valve is installed in a flametrap at the top of the canister. Gas or air that is removed from the fuel by the pump, is sent back to the fuel tank through the vent valve. The valve prevents fuel flow in the opposite direction and is opened by a probe in the related fuel pump. When the fuel pump is not in operation the check valves prevent a flow of fuel back through the pump.

 The canisters have a single (lower) inlet that connects to the fuel strainers 6QM(8QM), 5QM(7QM).

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 The canisters 84QM(85QM) are attached to the center tank bottom skin and fully contain the fuel pump element. Each canister has:
 -an upper outlet that connects to the engine feed line
 -
a (smaller) outlet that connects to the scavenge jet pumps 89QM(90QM), and the fuel pump pressure switches 39QA(40QA)

 -
a vent valve installed on the top of the canister

 -
a lower inlet that connects to a fuel strainer. The vent valve is installed in a flametrap at the top of the canister. Gas or air that is removed from the fuel by the pump, is sent back to the fuel tank through the vent valve. The valve prevents fuel flow in the opposite direction and is opened by a probe in the related fuel pump. When the fuel pump is not in operation the check valves prevent a flow of fuel back through the pump.

 **ON A/C ALL
 The canister makes it possible to replace the fuel pump element when there is fuel in the fuel tank. When the fuel pump element is replaced, the internal check valve, the second check valve and a slide valve seal the canister.
　
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