external-noticable-critical-operation-conditions-4Fuel systemLeak (chapter 23.5)Causes:- Secondary failures by the exit of a fracture fragment.- Failure at a pipe line. (fretting, fatigue fracture, chapter 23.5)- Seal problems, e.g., at maintenance problems. Typical operation condition:- more pronounced at high fuel pressure respectively high flow rate (Ill. 19.2-2.2).- Fuel discharge more probable at low hights or on ground. Feature/symptoms:- indication only when the leak is behind the flow meter.- Fuel discharge, fuel mist, fuel signs at the pylon.- Fire exit/fire warning.Suitable behaviour: - Decision considering that no fuel shortage will occur. - Introduction for the emergency, - Preparation during landing. Consequences for the engine:- Fire at low hights more probable. Malfunction of the shutdown(chapter 22.2)Causes:- malfunction of the fuel shut-off valve.- Suction of foreign fuel, e.g. open tank cover. Clogging (chapter 22.2)Causes:- consequence of a pump failure.-Contamination during maintenance.- Contamination of the fuel with water, rust, algaes.- Ice formation in the filter. Typical operation condition:primarily at high powerlike start or climb.Features/symptoms:- signs of a high bypass flow in the filter area.- Engine outage, when also several fuel problems.suitable behaviour: accordant "Aircraft Flight Manual". Misinterpretation:- Fuel shortage.Fuel mistWhat we can see during "passing by".BA.Rossmann Typical operation condition:shut down of the engineFeatures/Symptoms:-shut down of the engine not possible. suitable behaviour: actuation of the cell side valve by pulling the "Fire handle". Does not function if foreign fuel is ingested.Consequences for the engine:rest fuel in the system canlet the engine run some minutes further.With foreign fuel: extremeengine damages.