________________________________________________________
 1. General
_______
 The Integrated Drive Generator (IDG) oil-cooling system (Ref. 24-21-00) uses part of the fuel supply to each engine. During oil cooling the temperature of the fuel increases. The fuel recirculation for the cooling system (recirculation system) moves the warm fuel from the IDG cooling system to the wing tank.
 Each engine has a recirculation pipe which moves the warm fuel to the wing tank. The interface between each IDG oil-cooling system and each recirculation pipe is a Fuel Return Valve (FRV) (Ref. 73-10-00).
 The operation of the FRV is controlled by the Full Authority Digital Engine
 Control (FADEC) system (Ref. 73-20-00).
 2. Component Location
__________________

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 (Ref. Fig. 001)
 **ON A/C 301-399,
 (Ref. Fig. 001A)

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 -------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF.
 -------------------------------------------------------------------------------122QM CHECK VALVE-FUEL RECIRCULATION, L 471 471BL 28-20-00 123QM CHECK VALVE-FUEL RECIRCULATION, R 481 482BR 28-20-00 124QM VALVE-PRESSURE HOLDING, L WING TANK 540 540MB 28-16-41 125QM VALVE-PRESSURE HOLDING, R WING TANK 640 640MB 28-16-41
 1EFF : ALL 1 28-16-00Page 1 1 1 Aug 01/05 1 1 1CES 1

 Recirculation System - Component Location
 Figure 001

R 1EFF : 001-049, 051-099, 101-149, 151-199, 1 28-16-00Page 2 1201-299, 401-499, 1Aug 01/05 1 1 1CES 1

R  Recirculation System - Component Location 
R  Figure 001A 
R 1EFF :  301-399,  1  28-16-00 Page 3 
1  1  May 01/04
 1  1
 1CES  1

 **ON A/C 301-399,
 -------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF. -------------------------------------------------------------------------------
122QM CHECK VALVE-FUEL RECIRCULATION, L 471 471BL 28-20-00 123QM CHECK VALVE-FUEL RECIRCULATION, R 481 482BR 28-20-00 218QM VALVE-PRESSURE HOLDING 540 540JB 28-20-00 219QM VALVE-PRESSURE HOLDING 640 640JB 28-20-00 222QM CHECK VALVE 540 540AB 28-20-00 223QM CHECK VALVE 540 540AB 28-20-00 224QM CHECK VALVE 640 640AB 28-20-00 225QM CHECK VALVE 640 640AB 28-20-00
 **ON A/C ALL
 3. System Description
__________________

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 The recirculation system has (for each engine):
 -
a recirculation pipe

 -
a recirculation check-valve 122QM(123QM)

 -
a recirculation pressure-holding valve 124QM(125QM).

 The recirculation pipe is between the FRV (Ref.73-10-00) and the pressure holding valve at the outboard face of RIB17 in the wing tank. Two holes, one each side of RIB16, let the warm fuel go into the wing tank outer cell.
 **ON A/C 301-399,
 The recirculation system has (for each engine):
 -
a recirculation pipe

 -
a cooling fuel pipe

 -
a piccolo tube

 -three recirculation check-valves 222QM(223QM), 224QM(225QM), 122QM(123QM)
 -a recirculation pressure-holding valve 218QM(219QM).
 The recirculation pipe connects to the FRV (Ref.73-10-00) and the inboard face of RIB16 in the wing tank. Two holes at the end of the recirculation pipe let the fuel go into the wing tank. The piccolo tube is attached to the
 1EFF : ALL 1 28-16-00Page 4 1 1 Aug 01/05 1 1 1CES 1 end of the recirculation pipe. The piccolo tube has six holes that let the fuel go into the wing tank.

 The cooling fuel pipe attaches to the recirculation pipe at the outboard face of RIB15. The main fuel pumps (Ref. 28-21-00) move the fuel (at an ambient temperature) through the cooling fuel pipe to the recirculation pipe.
 **ON A/C ALL
 (Ref. Fig. 002) The recirculation check valve 122QM(123QM) is attached (through a mounting block and an insulating block) to the lower surface of the wing bottom skin in the engine pylon. It connects the recirculation pipe from the engine to the recirculation pipe in the wing. When the recirculation system is not in operation, it closes to prevent a fuel flow from the wing tank to the engine.
 **ON A/C 301-399,
 (Ref. Fig. 003) The recirculation check valves 222QM(223QM), 224QM(225QM) are in a manifold that is attached to the inboard face of RIB2. When the related fuel pump is not in operation, they close to prevent a fuel flow from the recirculation system to the main fuel pumps.
　
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