High density altitude can reduce turbojet aircraft performance in which of the following ways?
A
It reduces the likelihood of maintaining laminar flow over the airfoils as airspeed and altitude increase.
B
It reduces thrust because there is a reduced mass of gases to force out of the exhaust.✓ Correct Answer
C
It reduces thrust because there is an increased mass of gases that inhibits the outflow of exhaust.
Explanation
A turbojet produces thrust by accelerating a mass of air and exhaust gases; in thinner, high-density-altitude air there is less mass to accelerate, so thrust decreases. Denser flow would increase thrust, and laminar flow over the wing is unrelated to engine output.
Related performance questions
Keep practising
Study more FAA Airline Transport Pilot questions, or take a timed practice quiz.