Narrative:

The call for a flight from the hospital came in around xa:00. The flight required us to fly from a to airport B; then to airport C and back to airport a. Upon; showing up at the airport I removed the covers and preflighted the aircraft including checking the oil through the engine service doors and re-latching the doors (both latches on each door where flush and clicked into locked position). We departed airport a and landed at airport B about 12 minutes later. The patient was brought to the aircraft by the ambulance; the rest of the crew and I never left the aircraft. We departed airport B at xb:24; while en-route we were advised that there was another potential flight. We landed at airport C at about xc:00; where the ambulance met the aircraft (again the crew and I never left the aircraft). Dispatch informed us that the pending flight was a go; so I decided it would be quickest to get fuel in airport a and not in airport C. We departed airport C at xc:24; halfway to airport a ATC asked us to keep the speed up; due to a 737 in trail. I asked; for a descent in order to keep the IAS at 215kts. A loud bang that shook the aircraft occurred between 6000 ft and 5000 ft; about 15 to 20 miles from ZZZ. First thought was that the nurses in the cabin dropped the monitor; thinking that was kind a lot of force; I decided to check. The crew said nothing fell and asked me what the bang was. I then scanned the engine instruments and they all looked normal. I then thought maybe we hit something; so I started to slow the aircraft down and I turned on the ice lights; scanned the wings no damage was apparent. My next thought was maybe a gear door departed the aircraft. I worked all the controls cautiously; while checking for response; again all seemed normal. I landed the aircraft normally at about xc:48 and parked. After inspecting the aircraft I noticed the right side inboard engine inspection panel departed the aircraft during flight. The two top hinges broke in half and the panel they were attached to broke away from the securing braces and bent the top panel up and outward. It also appears that the vertical stabilizer boot was cut by the panel's departure. The only abnormality I was able to find was the holes the locking pins sit in while locked were worn and elongated (all the housings on all the doors show the same kind of wear). There appears to be no structural damage to the aircraft; not requiring any NTSB part 830 reporting.

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Original NASA ASRS Text

Title: King Air pilot reports right inboard engine inspection panel departing the aircraft in flight at 215 knots. Panel had been opened and relatched by the crew two legs prior to the incident.

Narrative: The call for a flight from the Hospital came in around XA:00. The flight required us to fly from A to airport B; then to airport C and back to airport A. Upon; showing up at the airport I removed the covers and preflighted the aircraft including checking the oil through the engine service doors and re-latching the doors (both latches on each door where flush and clicked into locked position). We departed airport A and Landed at Airport B about 12 minutes later. The patient was brought to the aircraft by the ambulance; the rest of the crew and I never left the aircraft. We departed airport B at XB:24; while en-route we were advised that there was another potential flight. We landed at airport C at about XC:00; where the ambulance met the aircraft (again the crew and I never left the aircraft). Dispatch informed us that the pending flight was a go; so I decided it would be quickest to get fuel in airport A and not in airport C. We departed airport C at XC:24; halfway to airport A ATC asked us to keep the speed up; due to a 737 in trail. I asked; for a descent in order to keep the IAS at 215kts. A loud bang that shook the aircraft occurred between 6000 FT and 5000 FT; about 15 to 20 miles from ZZZ. First thought was that the nurses in the cabin dropped the monitor; thinking that was kind a lot of force; I decided to check. The crew said nothing fell and asked me what the bang was. I then scanned the engine instruments and they all looked normal. I then thought maybe we hit something; so I started to slow the aircraft down and I turned on the ice lights; scanned the wings no damage was apparent. My next thought was maybe a gear door departed the aircraft. I worked all the controls cautiously; while checking for response; again all seemed normal. I landed the aircraft normally at about XC:48 and parked. After inspecting the aircraft I noticed the right side inboard engine inspection panel departed the aircraft during flight. The two top hinges broke in half and the panel they were attached to broke away from the securing braces and bent the top panel up and outward. It also appears that the vertical stabilizer boot was cut by the panel's departure. The only abnormality I was able to find was the holes the locking pins sit in while locked were worn and elongated (all the housings on all the doors show the same kind of wear). There appears to be no structural damage to the aircraft; not requiring any NTSB Part 830 reporting.

Data retrieved from NASA's ASRS site as of April 2012 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.