Flashcards on Aircraft Engine Fuel Metering Systems
Aircraft Engine Fuel Metering Systems Explained: A Student Guide
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Aircraft engine fuel systems
11 cards
Card 1
Question: What are the two purposes of the manifold valve (or flow divider) in the fuel injection system of a horizontally opposed aircraft engine?
Answer: 1) Provide a constant discharge fuel pressure for idling. 2) Provide a positive shutoff for the fuel when the engine is shut down.
Card 2
Question: How does the mixture control change the air-fuel mixture ratio on the Teledyne-Continental fuel injection system?
Answer: Full rich: all fuel goes to the manifold valve. Idle cutoff: all fuel is returned to the pump inlet. Intermediate positions vary the amount sent to th
Card 3
Question: Why must the diaphragms of a pressure carburetor be soaked before flight?
Answer: Soaking restores the diaphragms to the flexibility they had when the carburetor was calibrated.
Card 4
Question: What are the two basic types of fuel controls for aircraft turbine engines?
Answer: Hydropneumatic and electro-hydromechanical.
Card 5
Question: How does exhaust gas temperature (EGT) indicate the air-fuel mixture in a reciprocating engine?
Answer: A stoichiometric mixture produces the highest EGT. The mixture is adjusted to the highest EGT, then enriched to place it on the rich side of stoichiom
Card 6
Question: What is controlled by adjusting the orifice in the fuel pump of a Teledyne-Continental fuel injection system?
Answer: The high unmetered fuel pressure.
Card 7
Question: What do the letters stamped on the flats of a fuel injection nozzle signify?
Answer: They designate the relative size of the injector orifice: the lower the letter in the alphabet, the smaller the fuel flow.
Card 8
Question: What is the function of the de-richment valve in a pressure carburetor used with an antidetonation injection (ADI) system?
Answer: When ADI fluid flows, the de-richment valve automatically closes to lean the mixture; when ADI stops, it opens and the mixture returns to rich.
Card 9
Question: What is the function of the economizer (power enrichment) system in an aircraft carburetor?
Answer: It allows economical lean operation except at full power; when throttle is opened for full power the system automatically enriches the mixture to remo
Card 10
Question: What position should the mixture control be in for starting an engine equipped with a pressure carburetor?
Answer: Idle cutoff — the engine is started using fuel from the primer system.