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An aircraft descends from FL340 to an airfield at MSL, where ambient temperature is +10ºC. Relating to the "Cold Soak Effect", which of the following statements is correct?
  • A
    Pitot tube and static port may be covered in ice.
  • B
    Wings may be covered in ice.
  • C
    Rudder may be covered in ice.
  • D
    Horizontal stabilizer may be covered in ice.

Cold-soak Effect

The wings of aircraft are said to be “cold-soaked” when they contain very cold fuel as a result of having just landed after a flight at high altitude or from having been re-fuelled with very cold fuel. Whenever precipitation falls on a cold-soaked aircraft when on the ground, clear icing may occur. Even in ambient temperatures between -2°C and +15°C, ice or frost can form in the presence of visible moisture or high humidity if the aircraft structure remains at 0°C or below. Clear ice is very difficult to be detected visually and may break loose during or after takeoff. The following factors contribute to cold-soaking: temperature and quantity of fuel in fuel cells, type and location of fuel cells, length of time at high altitude flights, temperature of re-fuelled fuel and time since re-fuelling.

Source: aircrafticing.grc.nasa.gov

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