What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
On February 25, 2013, N44ZF departed the Opa Locka Airport at approximately 0750 local time. The aircraft's initial destination was kdal (dallas love field) with 3 souls on board, including a two pilot crew consisting of privacy data omitted, and privacy data omitted, both type rated and current to fly the aircraft.
In the first 10 minutes or so of the flight it was determined that the aircraft was not achieving the proper level of cabin pressurization. Upon determining this fact, the crew stopped the climb of the aircraft at no more than 12,000 feet MSL, at which time the aircraft had a cabin altitude of approximately 6,000 feet.
Upon investigation of the cause it was discovered that the cabin door seal was not properly inflating and a decision was made by the PIC, privacy data omitted, that the aircraft would return to kopf for evaluation before further flight was undertaken. ATC was notified of the need to return and advised that there was not an emergency situation at hand.
The aircraft returned to kopf a few minutes later and executed a normal approach and landing without incident.
Maintenance technicians immediately surveyed the aircraft's systems related to the problem, identified door seal out of position. Technician re-seated seal in track and torqued the clamp. Work was performed using G-IV amm chapter 52-00-03
As the FAA filed it
ON FEBRUARY 25, 2013, N44ZF DEPARTED THE OPA LOCKA AIRPORT AT APPROXIMATELY 0750 LOCAL TIME. THE AIRCRAFT'S INITIAL DESTINATION WAS KDAL (DALLAS LOVE FIELD) WITH 3 SOULS ON BOARD, INCLUDING A TWO PILOT CREW CONSISTING OF ^PRIVACY DATA OMITTED^, AND ^PRIVACY DATA OMITTED^, BOTH TYPE RATED AND CURRENT TO FLY THE AIRCRAFT.
IN THE FIRST 10 MINUTES OR SO OF THE FLIGHT IT WAS DETERMINED THAT THE AIRCRAFT WAS NOT ACHIEVING THE PROPER LEVEL OF CABIN PRESSURIZATION. UPON DETERMINING THIS FACT, THE CREW STOPPED THE CLIMB OF THE AIRCRAFT AT NO MORE THAN 12,000 FEET MSL, AT WHICH TIME THE AIRCRAFT HAD A CABIN ALTITUDE OF APPROXIMATELY 6,000 FEET.
UPON INVESTIGATION OF THE CAUSE IT WAS DISCOVERED THAT THE CABIN DOOR SEAL WAS NOT PROPERLY INFLATING AND A DECISION WAS MADE BY THE PIC, ^PRIVACY DATA OMITTED^, THAT THE AIRCRAFT WOULD RETURN TO KOPF FOR EVALUATION BEFORE FURTHER FLIGHT WAS UNDERTAKEN. ATC WAS NOTIFIED OF THE NEED TO RETURN AND ADVISED THAT THERE WAS NOT AN EMERGENCY SITUATION AT HAND.
THE AIRCRAFT RETURNED TO KOPF A FEW MINUTES LATER AND EXECUTED A NORMAL APPROACH AND LANDING WITHOUT INCIDENT.
MAINTENANCE TECHNICIANS IMMEDIATELY SURVEYED THE AIRCRAFT'S SYSTEMS RELATED TO THE PROBLEM, IDENTIFIED DOOR SEAL OUT OF POSITION. TECHNICIAN RE-SEATED SEAL IN TRACK AND TORQUED THE CLAMP. WORK WAS PERFORMED USING G-IV AMM CHAPTER 52-00-03