The Auxiliary Power Unit (APU) of an aircraft is inoperative. There are no ground-start facilities available at the aerodrome, but the APU is necessary to start the engines. Therefore, one engine is kept running while the aircraft is refueled, and ground serviced. The temperature is around 0 C and a light snow is falling. De-icing treatment is permitted only with engines off. If all the engines are shut down, the aircraft can only be re-started once the APU is repaired. To depart from the airport as planned, the Commander decides not to de-ice. A few minutes after take-off, the aircraft develops ice-formation on the wings and consequently, it stalls.
Which of the following statements most correctly explains the decision-making of the Commander?

Question

The Auxiliary Power Unit (APU) of an aircraft is inoperative. There are no ground-start facilities available at the aerodrome, but the APU is necessary to start the engines. Therefore, one engine is kept running while the aircraft is refueled, and ground serviced. The temperature is around 0 C and a light snow is falling. De-icing treatment is permitted only with engines off. If all the engines are shut down, the aircraft can only be re-started once the APU is repaired.  To depart from the airport as planned, the Commander decides not to de-ice. A few minutes after take-off, the aircraft develops ice-formation on the wings and consequently, it stalls.  
  Which of the following statements most correctly explains the decision-making of the Commander?

Answer

The Commander has made a good assessment of the situation but takes too much time to reach a decision. As a result, the risk of ice contamination increases, along with a reduction in aircraft performance.

0%

Answer

The decision to depart is good, but the Commander fails to review the decision once they have taken-off byignoring the influence of ice contamination on aircraft performance.

Answer

The Commander properly assesses the situation and evaluates the options correctly, giving priority to the aircraft departing on time and minimizing inconvenience to the passengers.

Answer

The Commander fails to properly evaluate his/her options before take-off by underestimating the risk of ice formation during flight and/or ignoring the influence of ice contamination on aircraft performance.

100%

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The Auxiliary Power Unit (APU) of an aircraft is inoperative. There are no groun...

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