Engine covers
Guys,
I have always covered engines and used the other blanks and bungs even on a short turn around if there is any waiting.
The reason being is that I have had wasps enter the pitot tube causing me to abort a take off when there was a major speed discrepancy during the acceleration. This was an expensive extra few days down route.
Also past discussions with members of the AAIB have led me to believe that they regularly see bearing wear, on engines they have stripped, which is due to windmilling with no oil lubrication. Whilst I have never heard of this wear being a contributory cause to a failure it will affect engine efficiency and overhaul costs.
Regards
MM