During winter ground operations, airport maintenance crews apply heated Type I de-icing fluids at high pressure to remove accumulated snow and frost from aircraft wings. Because Type I mixtures have low viscosity and shed quickly during taxiing, ground handlers apply unheated Type IV anti-icing fluid immediately afterward. This thicker fluid adheres to horizontal surfaces, forming a protective barrier that absorbs freezing precipitation until takeoff. Once the aircraft accelerates down the runway, the aerodynamic shearing force sweeps the temporary layer away, restoring the wing's clean profile without compromising lift.
According to the passage, how is the secondary anti-icing coating removed from the aircraft?
- AMaintenance crews spray heated mixtures at high pressure to wash off the thicker fluid before taxiing.
- BInternal wing heating elements melt the remaining compound after the plane reaches flight altitude.
- Airflow created as the airplane accelerates down the tarmac pushes the protective film off the wings.Answer
- DA deliberate loss of aerodynamic lift forces the fluid barrier to detach from the aircraft.
Answer
Airflow created as the airplane accelerates down the tarmac pushes the protective film off the wings.
The text directly states that as the aircraft accelerates along the runway, the 'aerodynamic shearing force sweeps the temporary layer away.' The correct choice rephrases 'aerodynamic shearing force' as 'airflow created as the airplane accelerates down the tarmac' and 'sweeps the temporary layer away' as 'pushes the protective film off the wings.'
Step-by-Step Solution
Key Concept
Paraphrased Fact Recognition