I was wondering how rare it is for multiple alpha probes to be blocked? In a recent incident an A321 experienced this and I was wondering where on the probe the blockage occurred as the probe is heated.It also seems strange that multiple probes were affected without other probes(pitots) also being blocked.
A previous thread was written about this two years ago(
http://www.pprune.org/tech-log/50366...oa-probes.html) but doesn't reference the applicable OEB. My airline has just issued a notice about this and refers to OEB 48.Can someone upload images of the different kind of probes please.