2.16 Abnormal combustion

Question 1

detonation occurs in a reciprocating aircraft engine when

Answer 1

the unburned charge in the cylinders explodes instead of burning normally

Question 2

detonation may occur at high power settings when

Answer 2

the fuel mixture ignites instantaneously instead of burning progressively and evenly

Question 3

if a pilot suspects that the engine (with a fixed pitch propeller) is detonating during climb out after takeoff, the initial corrective action to take would be to

Answer 3

lower the nose slightly to increase airspeed

Question 4

if the grade of fuel used in an aircraft engine is lower than specified for the engine, it will most likely cause

Answer 4

detonation

Question 5

the uncontrolled firing of the fuel/air charge in advance of normal spark ignition is known as

Answer 5

pre-ignition