B737 Scavenge Jet Pump
BOEING STATE ON PAGE 12.20.2 OF VOLUME 2 THAT FUEL IS TRANSFERED FROM THE CENTER TANK
TO MAIN TANK No 1 UNDER CERTAIN CONDITIONS.
MY ACTUAL UNDERSTANDING IS THAT FUEL IS " NOT TRANSFERED " AT ALL.
WHEN THE " SCAVENGE JET PUMP " ( APROX 80 KG/HR ) OPERATES, IT SYPHONS FUEL FROM THE CENTRE TANK AND
COMBINES IT WITH FUEL SUCTION FEED FROM MAIN TANK No 1 AND SENDS IT TO THE ENGINE VIA THE
No 1 FUEL MANIFOLD.
THE " ILLUSION " OF THE TRANSFER OF FUEL COMES ABOUT BECAUSE THE DECREASE IN FUEL TANK QUANTITY
IN MAIN TANK No 1 IS LESS THAN THAT IN MAIN TANK No 2 ( PROVIDING FF ARE APPROX SAME ) GIVING A FUEL IMBALANCE.
DOES ANYONE ELSE SEE IT THIS WAY ( IE PAGE 12.20.4 ) ?