Airlines also must inspect scavenge pump wiring on older Boeing 747 aircraft for deterioration of insulting materials in electrical connectors.
12.
The scavenge pump from the TWA plane is part of the 4 percent of the airplane that searchers have not recovered.
13.
The vertically mounted, tube-shaped separators contained a centrifugal impeller at the top connected to an impeller-type scavenge pump at the bottom.
14.
The search for the remaining 10 percent is now focusing on a missing fuel pump, known as a " scavenge pump ."
15.
The pump in question is called a " scavenge pump, " which drains out the last few gallons from the center tank.
16.
Therefore, an inverted V engine would have a minimum of two scavenge pumps and a pressure pump in the pump " stack ".
17.
There were also designs that employed a scavenge pump or similar to remove oil from the crankcase and return it to the lubricating-oil reservoir.
18.
Airlines will also be required to inspect scavenge pump wiring on some older Boeing 747 aircraft to detect deterioration of insulting materials in electrical connectors.
19.
The presence of the scavenge pump was necessary to ensure the entire separator did not simply fill up with high-pressure coolant coming from the engine.
20.
"How important is it whether it was the fuel gauge wiring, the scavenge pump or some other wiring ? " one former board official asked.
