This is an excerpt from a report made to the Aviation Safety Reporting System. The narrative is written by the pilot, rather than FAA or NTSB officials. To maintain anonymity, many details, such as aircraft model or airport, are often scrubbed from the reports.
The DA40 Diamond Star’s rear door was closed and latched prior to takeoff with no door annunciation.
During the takeoff roll around the time of rotation, we received a door annunciation.
After rotation, I looked back at the door and noticed it had come slightly open. The safety latch did not appear to be holding the door closed.
I elected to make closed traffic and return for landing to shut the door.
I did not touch the door as the checklist advises against touching the rear door in flight.
At around 500-600 feet AGL, just prior to turning crosswind, the rear door came off of the airplane.
We continued the pattern and landed safely.
Primary Problem: Aircraft