To MB2002
In regards to your first post about level off...
Standby ALT is what you need to look at...as I think was pointed out...the Static sensor runs straight to it without being "corrupted" by an ADR.
On take off the only reason why this sensor would be blocked would be if maintenance covered it up and it was not picked up on a walk round,...
To TyroPicard
1 which comes to mind was I think Lan Chile with exactly what happened above...the other methinks was an Air India....I will dig around and post if I find specifics..