What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23)On March 27, 2001, at 1015 EST, while descending through 3,000 feet, the main cabin door opended while approaching to land at Richmond international airport (ric). The aircraft landed safely on runway 34 without further incident. Further investigation revealed two (2) failed micro switches in the main cabin door, one for the latch pin the other for the latch handle. A lock of lubrication was also noted which made the operation of the latching handle hard to operate, which may have caused the latching pin not to engage properly. It was noted that one latching cam assembly was not properly aligned with the locked alignment sight gauge.
As the FAA filed it
(-23)ON MARCH 27, 2001, AT 1015 EST, WHILE DESCENDING THROUGH 3,000 FEET, THE MAIN CABIN DOOR OPENDED WHILE APPROACHING TO LAND AT RICHMOND INTERNATIONAL AIRPORT (RIC). THE AIRCRAFT LANDED SAFELY ON RUNWAY 34 WITHOUT FURTHER INCIDENT. FURTHER INVESTIGATION REVEALED TWO (2) FAILED MICRO SWITCHES IN THE MAIN CABIN DOOR, ONE FOR THE LATCH PIN THE OTHER FOR THE LATCH HANDLE. A LOCK OF LUBRICATION WAS ALSO NOTED WHICH MADE THE OPERATION OF THE LATCHING HANDLE HARD TO OPERATE, WHICH MAY HAVE CAUSED THE LATCHING PIN NOT TO ENGAGE PROPERLY. IT WAS NOTED THAT ONE LATCHING CAM ASSEMBLY WAS NOT PROPERLY ALIGNED WITH THE LOCKED ALIGNMENT SIGHT GAUGE.