Fuel/Air Mixture Flashcards
(7 cards)
Why must pilots adjust fuel flow with the mixture control as altitude increases?
As altitude increases, air density decreases, causing the fuel/air mixture to become excessively rich. Adjusting the mixture ensures optimal power output.
What happens if the fuel/air mixture is too rich?
Excessive fuel consumption, rough engine operation, power loss, and spark plug fouling due to lower cylinder temperatures.
What are the consequences of an excessively lean mixture?
Rough engine operation, detonation, overheating, and power loss.
What instrument can help pilots optimize the fuel/air mixture?
The Exhaust Gas Temperature (EGT) gauge provides accurate feedback on exhaust temperatures, helping pilots lean the mixture for efficiency.
How does an EGT gauge work?
It measures the temperature of exhaust gases at the exhaust manifold, indicating the fuel/air mixture ratio. The mixture is leaned until the EGT peaks, then enriched slightly.
How is a fuel-injected engine’s mixture control adjusted?
The mixture control is moved to set the manufacturer’s recommended fuel flow using a fuel flow indicator.
How can pilots lean the mixture without instruments?
Lean the mixture until engine roughness develops, then enrich it slightly until smooth operation resumes.
