What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
On December 27, 2013 the pilot in command on a flight from spirit of st. louis airport (ksus) to palm beach international (kpbi). Shortly after departure at approximately 16,000FT the PIC got a master caution cabin altitude light. The PIC declared an emergency and was given clearance to land back at (ksus). The aircraft landed with out incident. After returning to (ksus) the PIC realized that the air source select switch on the pressurization panel was in the "off" position. This switch should of been in the "both" position for cabin pressurization. The PIC confirmed the system was working ok, refueled the aircraft and departed for (kpbi)
As the FAA filed it
ON DECEMBER 27, 2013 THE PILOT IN COMMAND ON A FLIGHT FROM SPIRIT OF ST. LOUIS AIRPORT (KSUS) TO PALM BEACH INTERNATIONAL (KPBI). SHORTLY AFTER DEPARTURE AT APPROXIMATELY 16,000FT THE PIC GOT A MASTER CAUTION CABIN ALTITUDE LIGHT. THE PIC DECLARED AN EMERGENCY AND WAS GIVEN CLEARANCE TO LAND BACK AT (KSUS). THE AIRCRAFT LANDED WITH OUT INCIDENT. AFTER RETURNING TO (KSUS) THE PIC REALIZED THAT THE AIR SOURCE SELECT SWITCH ON THE PRESSURIZATION PANEL WAS IN THE "OFF" POSITION. THIS SWITCH SHOULD OF BEEN IN THE "BOTH" POSITION FOR CABIN PRESSURIZATION. THE PIC CONFIRMED THE SYSTEM WAS WORKING OK, REFUELED THE AIRCRAFT AND DEPARTED FOR (KPBI)