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    r         FEEDBACK_
CCM ALL
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┃                                ┃                            ┃1.70.40     P 6       ┃
┃                                ┃                            ┣━━━━━┳━━━━━┫
┃I  ~-L A318                     ┃l         POWERFUELNSYSTEM  ┃SEQ 005 1 ┃I REV 23  ┃
┃ aw aw ,, ~L,~ A319             ┃                            ┃          ┃          ┃
┃ Lli,~ A320                     ┃                            ┃          ┃          ┃
┃      A~7-~'M" A321             ┃                            ┃          ┃          ┃
┃   FLIGHT CREW OPERATING MANUAL ┃                            ┃          ┃          ┃
┗━━━━━━━━━━━━━━━━┻━━━━━━━━━━━━━━┻━━━━━┻━━━━━┛
Some of the fuel flowing out of the HMU goes to cool the oil systems of the Integrated Drive
Generators (IDGs). It then returns to the fuel pump unit or to the tank.
The Fuel Return Valve (FRV), controlled by the FADEC, ensures that this flow
e
At low engine thrust, if the oil going into the IDG is too hot, the cooling fuel is sent back
to the tank (300 kg/h)~
If oil temperature continues to rise, the ECU increases the minimum N2~
If oil temperature still keeps rising, the FAOEC increases the fuel flow to the tank (from 300
to 600 kg/h, depending on fuel return temperature)~
The fuel return valve is always mixing hot fuel with cold fuel so that the temperature of fuel
returning to the tank stays below I00~C (from 200 to 400 kg/h, depending on fuel return
temperature).
Fuel recirculation to the tank is inhibited (FVR closed) in the following cases :
- at engine shutdown
- during takeoff and climb
-if:
   ~ wing tank level is below about 300 kg (660 Ib).
   ~ there is fuel overflow in the surge tank
   ~ fuel feed is by gravity only~
- when fuel temperature in the wing tank in flight is above 52.5~C
Note : On the ground high fuel temperature in the wing tanks does not cause the FRV
       to close.
FUEL TANK
TO OUTER
  TANK
CCM ALL
CCM ALL
~:        I           I  ,        ,
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┃  .*,,.8, ,, ~e~ A319           ┃POWER PLANT   ┃1.70.40     P 7       ┃
┃                                ┃              ┣━━━━━┳━━━━━┫
　
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本文鏈接地址：AIRBUS A320 Flight Crew Operating Manual5(164)