Incident Details
The pilot in command reported that during the loading of the seventh and final passenger, the airplane tipped onto its tail and impacted the ramp surface. The tail stand was not installed, and neither the pilot nor the co-pilot noticed the omission before passenger loading began.
Post-Flight Inspection
According to the operator's National Transportation Safety Board Accident/Incident report form 6120.1, after a review of photographs sent to company maintenance, no "major damage" was visually identified. The airplane was released for service, and the flight crew completed the revenue flight. After the airplane reached a company domicile, it was grounded following a further visual inspection that revealed substantial damage to the aft bulkhead.
The pilot reported no mechanical malfunctions or failures with the airplane that would have precluded normal operation.