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Old 11-12-2015, 10:35 AM   #1
AlphaOneSix
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Default How it Works: Mi-8 Ice Protection System

Well, someone mentioned wanting to know about the ice protection system on the Mi-8, so here it is. As usual, there is a caveat.

The aircraft I work on are all newer, so none of our aircraft have the RIO-3 Ice Detector set anymore, which is what we have in DCS. The attached documentation only talks about the SO-121VM ice detection system. So I will expand here to fill in the gap.

The big difference is in how the two detectors work. The SO-121VM uses a vibrating head where the frequency of the vibration changes as ice builds up on the detector. When the frequency changes to a certain point, the detector sends the ICING signal. The older RIO-3 uses a radioactive source in the detector tip with a beta particle sensor in the base. As ice builds up on the detector tip, the beta rays are partially blocked, and when the beta ray sensor detects a sufficiently low number of beta ray emissions from the detector tip, it activates the ICING signal. In both cases, the amount of ice needed to set off an ICING signal is 0.3mm.

The difference on the anti-ice control panel that you should notice right away is that there is no ice detector test button and there is no ice detector heating switch. Both of these functions are built into the SO-121VM, so they were removed from the panel. But the ice detector heater works just like the right engine and windshield anti-ice, i.e. it's automatic unless you turn it on manually. The heating process for the RIO-3 is exactly the same as the SO-121VM that I discuss in the attached PDF. The test button just makes sure that the heating element in the ice detector is working.
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File Type: pdf Mi-8 Ice Protection System.pdf (2.45 MB, 1809 views)
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Old 11-12-2015, 01:06 PM   #2
Corrigan
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Fantastic, thanks so much.
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Old 11-12-2015, 07:17 PM   #3
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Thanks! Don't stop!
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Old 11-12-2015, 07:45 PM   #4
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Nice, Thank you!
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Old 11-13-2015, 02:53 AM   #5
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This is gold!!! Thank you for this
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Old 06-02-2017, 09:00 PM   #6
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Lovely... musta missed this one!
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Old 07-04-2017, 10:23 AM   #7
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Many thanks for that - much appreciated.

Can you explain why the left engine de-icing is manual only? Am I missing something obvious?
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Old 07-04-2017, 12:23 PM   #8
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It is explained on the page 46 of the posted pdf:

"The left engine and DPD anti-ice will not activate automatically. It should be turned on manually approximately 1 minute after the right engine anti-ice activates, and only if the right engine continues to operate normally (i.e. has not lost power due to ice ingestion)."
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Old 07-04-2017, 02:31 PM   #9
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hi guys,
for the easiest way, what should we do when we hear icing warning?
is everything automatic and we should do nothing or turn on left engine a-i ?
should we turn it off after icing is over?

and, the round panel which shows main / rotor / blades etc. should we do something with this?

ps: i use auto start function
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Old 07-04-2017, 09:46 PM   #10
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First, check if your circuit breakers for the de-icing system are actually engaged, otherwise, turn them on.

Next up,one post above yours;

The left engine and DPD anti-ice will not activate automatically. It should be turned on manually approximately 1 minute after the right engine anti-ice activates, and only if the right engine continues to operate normally (i.e. has not lost power due to ice ingestion)
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