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  • Heated Ice Probe

    Q.ID 211054: 'How does a heated ice probe indicate icing conditions?'

    The correct answer is marked as:
    'Ice warning light cycling on and off in the cockpit'.

    Couldn't the answer also be:
    'Ice visible from the cockpit'?

    As both VIBRATING ROD and HOT ROD systems are heated ice probes, how would you know which answer they're after? Thank you

  • #2
    Lou,

    The pilot noticing icing by looking out of the window is an excellent way of detecting ice. However, the question asks how the hot rod system works. It does so as described in both the correct answer and in the explanation to the question. Best not to try to second guess the question setter - they are really not that clever

    Hope that helps?

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    • #3
      Appreciate the reply.. but no, sorry Chris.. more confused than ever.

      The BGS explanation (to Q.211054) makes it clear the question is referring to the VIBRATING ROD system - not the HOT ROD system. However surely both systems could be described as a 'heated ice probe'?

      VIBRATING ROD: 'A rod in the device is vibrated at 40 KHz. When ice forms on the rod, it slows down which illuminates the ice warning light and activates a heater within the rod. This melts the ice so the rod returns to its 40 KHz, extinguishing the warning light until ice forms on it again. If the light remains on constantly the ice detector is faulty.'

      HOT ROD: 'An aerofoil section rod is mounted below the pilot side screen angled back. The rod is painted black and contains a heater element. When ice forms on the rod, the pilot can heat it removing the ice, then observe and time how quickly it takes the ice to reform. A light that illuminates the rod allows the pilot to use the system at night.'

      Couldn't either system be applied in the context of this question?

      Comment


      • #4
        See your point Lou. The question was created from feedback, so may need a tweak to make it less ambiguous. I'll have another look.

        Comment


        • #5
          Chris I came across that question again, and see it has been amended to: 'How does a 'hot rod' ice probe indicate icing conditions?'..

          However the answer - and explanation - still seem to refer to the vibrating rod (Rosemount) system.

          Is this correct? I thought the hot rod was a external visual aid, with no indications in the cockpit..? Thank you.

          Comment


          • #6
            You are correct. The question now reflects reality, even if it does not reflect the original EASA wording...

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