What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
Pilot was enroute in VMC conditions from martinsburg / eastern WV regional airport (mrb)to a site approximately 7 miles sw of Charleston Yeager Airport (crw), WV for the purpose of aerial mapping with an onboard camera system and cameraman. Approximately 60 miles from crw and at 10,500 feet AGL he experienced a problem with the left engine of which there was no EGT indication and the manifold pressure indicated low. He diverted to Charleston/Yeager Airport (crw), WV to have maintenance look at the issue. He was able to maintain power with the left engine in cruise and during the approach. During the approach sequence the pilot neglected to put the landing gear handle completely down - only to mid position, did not verify three green landing gear indicators, and the landing gear remained retracted. The landing gear warning horn did sound but the pilot thought it was the stall warning horn. The pilot landed the aircraft with the gear retracted on runway 23. The aircraft propellers sustained damage and the underside of the aircraft sustained minor damage. The pilot noted some smoke in the cockpit prior to exiting the aircraft, however no fire was present. The pilot and cameraman were unhurt.
As the FAA filed it
PILOT WAS ENROUTE IN VMC CONDITIONS FROM MARTINSBURG / EASTERN WV REGIONAL AIRPORT (MRB)TO A SITE APPROXIMATELY 7 MILES SW OF CHARLESTON YEAGER AIRPORT (CRW), WV FOR THE PURPOSE OF AERIAL MAPPING WITH AN ONBOARD CAMERA SYSTEM AND CAMERAMAN. APPROXIMATELY 60 MILES FROM CRW AND AT 10,500 FEET AGL HE EXPERIENCED A PROBLEM WITH THE LEFT ENGINE OF WHICH THERE WAS NO EGT INDICATION AND THE MANIFOLD PRESSURE INDICATED LOW. HE DIVERTED TO CHARLESTON/YEAGER AIRPORT (CRW), WV TO HAVE MAINTENANCE LOOK AT THE ISSUE. HE WAS ABLE TO MAINTAIN POWER WITH THE LEFT ENGINE IN CRUISE AND DURING THE APPROACH. DURING THE APPROACH SEQUENCE THE PILOT NEGLECTED TO PUT THE LANDING GEAR HANDLE COMPLETELY DOWN - ONLY TO MID POSITION, DID NOT VERIFY THREE GREEN LANDING GEAR INDICATORS, AND THE LANDING GEAR REMAINED RETRACTED. THE LANDING GEAR WARNING HORN DID SOUND BUT THE PILOT THOUGHT IT WAS THE STALL WARNING HORN. THE PILOT LANDED THE AIRCRAFT WITH THE GEAR RETRACTED ON RUNWAY 23. THE AIRCRAFT PROPELLERS SUSTAINED DAMAGE AND THE UNDERSIDE OF THE AIRCRAFT SUSTAINED MINOR DAMAGE. THE PILOT NOTED SOME SMOKE IN THE COCKPIT PRIOR TO EXITING THE AIRCRAFT, HOWEVER NO FIRE WAS PRESENT. THE PILOT AND CAMERAMAN WERE UNHURT.