scavenge pump

English edit

scavenge pump (plural scavenge pumps)

(chiefly aviation) A fuel pump used to remove the last dregs of usable fuel from a fuel tank once the fuel level in the tank has fallen too low for the primary fuel pumps to be able to draw fuel from the tank.
- 2000 August 23, National Transportation Safety Board, “1.6.2.2 747-100 Fuel Pump System Description”, in Aircraft Accident Report: In-flight Breakup Over the Atlantic Ocean, Trans World Airlines Flight 800, Boeing 747-131, N93119, Near East Moriches, New York, July 17, 1996‎^[1], archived from the original on 11 July 2022, page 40:
  The scavenge pump is designed to remove the last amounts of usable fuel from the CWT and pump it into the left inboard (No. 2) fuel tank. The intake opening for this pump is located very close to the bottom of the tank between the mid spar and SWB2. Although the scavenge pump removes fuel that is unobtainable by the jettison/override pumps, a small amount of residual fuel will remain in the fuel tank that the scavenge pump is not able to remove (unusable fuel). In the 747 CWT, the jettison/override and scavenge pumps are mounted on the rear spar such that the pump motor is external to the tank but contains fuel-cooled windings.