What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
N15791 a Piper PA-28-140, impacted an object (rebar) protruding from the terrain when the pilot landed 300 feet short of runway 16 threshold at Chehalis airport, Chehalis, Washington. The commercial pilot was receiving a flight review from his flight instructor. As part of the flight review after several landings the instructor pulled engine power and informed the commercial pilot the engine failed. The commercial pilot then executed an engine out procedure (simulated power-off landing). Because he failed to manage his glide profile in a manner that allowed him to extend the airplane's glide all the way to the approach end of the runway, and since he did not add engine power, the airplane touched down in a grassy area just over 300 feet short of the runway threshold impacting a peace of rebar protrudding from the ground. The rebar was outside the runway safety area and protruding about a foot and a half above the ground. It had been placed there by Chehalis airport maintenance personnel to mark the location of a future approach lighting system.
As the FAA filed it
N15791 A PIPER PA-28-140, IMPACTED AN OBJECT (REBAR) PROTRUDING FROM THE TERRAIN WHEN THE PILOT LANDED 300 FEET SHORT OF RUNWAY 16 THRESHOLD AT CHEHALIS AIRPORT, CHEHALIS, WASHINGTON. THE COMMERCIAL PILOT WAS RECEIVING A FLIGHT REVIEW FROM HIS FLIGHT INSTRUCTOR. AS PART OF THE FLIGHT REVIEW AFTER SEVERAL LANDINGS THE INSTRUCTOR PULLED ENGINE POWER AND INFORMED THE COMMERCIAL PILOT THE ENGINE FAILED. THE COMMERCIAL PILOT THEN EXECUTED AN ENGINE OUT PROCEDURE (SIMULATED POWER-OFF LANDING). BECAUSE HE FAILED TO MANAGE HIS GLIDE PROFILE IN A MANNER THAT ALLOWED HIM TO EXTEND THE AIRPLANE'S GLIDE ALL THE WAY TO THE APPROACH END OF THE RUNWAY, AND SINCE HE DID NOT ADD ENGINE POWER, THE AIRPLANE TOUCHED DOWN IN A GRASSY AREA JUST OVER 300 FEET SHORT OF THE RUNWAY THRESHOLD IMPACTING A PEACE OF REBAR PROTRUDDING FROM THE GROUND. THE REBAR WAS OUTSIDE THE RUNWAY SAFETY AREA AND PROTRUDING ABOUT A FOOT AND A HALF ABOVE THE GROUND. IT HAD BEEN PLACED THERE BY CHEHALIS AIRPORT MAINTENANCE PERSONNEL TO MARK THE LOCATION OF A FUTURE APPROACH LIGHTING SYSTEM.