What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
Cessna 206 performing a post maintenance test flight due to low oil pressure discrepancy. After one successful touch and go upon reaching 600' AGL the pilot heard a loud bang followed by vibration and oil covering the windshield. Pilot landed without incident. Maintenance discovered a large hole in top of the engine case at the no.4 cylinder location.
As the FAA filed it
CESSNA 206 PERFORMING A POST MAINTENANCE TEST FLIGHT DUE TO LOW OIL PRESSURE DISCREPANCY. AFTER ONE SUCCESSFUL TOUCH AND GO UPON REACHING 600' AGL THE PILOT HEARD A LOUD BANG FOLLOWED BY VIBRATION AND OIL COVERING THE WINDSHIELD. PILOT LANDED WITHOUT INCIDENT. MAINTENANCE DISCOVERED A LARGE HOLE IN TOP OF THE ENGINE CASE AT THE NO.4 CYLINDER LOCATION.