Reference
Don't have one BUT BEA had two accident reports involving slush which they sat on prior to the Munich disaster, the second was a Dutch one iirc. Replicated with the Trident at Staines (premature droop retraction due to pilot error and the " unique" SOP).
I seem to remember that it was in one of the German reports (in German).
Have just googled Cap 153 G-ALZU but have only come up with the translated first German report..could not see any reference to the Canadian and Dutch accidents but there is a directive from the regulator dated 1947.
It is a fact that BA in the 80s could operate into Zurich when it was closed to Swissair due contamination.
You might find something in the flight global archives.
Another coincidence was that Stan Key of papa india was the union rep at the inquiry.
Last edited by blind pew; 14th Jun 2020 at 18:24.