Originally Posted by
ericferret
Sight glasses are notorious on engines and gearboxes.
Got called out to a police BO 105 which was suffering from low engine oil pressure.
An initial look at the tanks appeared to show oil levels normal.
A closer look showed a full tank for one engine and a "tide mark" for the second.
A look into the tank confirmed no oil.
Yes, an AAC Lynx was lost in Germany for that reason.