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5 Answers

Why is the pitot heat rocker switch cover on C172S green?

Asked by: 592 views General Aviation

Does anyone know why Pitot Heat rocker switch cover is green?

Is there color coding regulation in aviation industry ?

Also, I have gone through the FARs on anti icing and deicing but it does not specify which equipment(names) is officially certified.

If you could provide any credible source, that would be ideal.

 

Thank you.

Connor

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5 Answers



  1. KDS on Jul 17, 2017

    As far as I know, it’s not a certification standard. However, on newer Cessna aircraft the anti-ice elements are marked in green. Here is a section of the panel from a Cessna Citation, which has several heated areas:

    https://support.cessna.com/docs/custsupt/techpubs/expertSystem/eSys750/eSys750-R1.0/eSysInfo/30ata/Pst/SI063.JPG

    I believe the other part of your question was how do you know to what level of icing an aircraft can be operated. I “think” the answer is in the aircraft certification and stated in the aircraft flight manual.

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  2. B.J. on Jul 17, 2017

    I can say it’s the same on the caravan – all de-ice/anti-ice switches have green caps.

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  3. connor on Jul 19, 2017

    Thanks B.J!

    I understand it is not a certification standard, and neither PIM has information stating that they are anti-ice, or de-ice equipment.

    Where do I need to look up for further research??

    Connor

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  4. Ken White on Jul 19, 2017

    Honestly Connor I would just call Cessna and ask. I called them with a different question and after being transferred a couple of times I ended up talking to exactly the right person who was was happy to answer my question. It can’t hurt.

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  5. Kris Kortokrax on Jul 19, 2017

    A little intuitive thinking (or experience) should tell you that if you turn it on before entering the icing conditions, if will act as an anti-ice device (will prevent the formation of ice). If you are in the icing conditions and notice the problem on your airspeed indicator and turn pitot heat on, it will act as a deicing device (will melt the ice that has formed).

    On Monday, I was onboard a Hawker 800XP in the morning. Their icing switches were rockers (not toggle switches as in the 172) and they were white. In the afternoon, I was in an Airbus 355-F2 helicopter. That pitot heat switch was a metal toggle with no color. The green is just a Cessna thing.

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