All sources of power that could initiate unlocking or unlatching of any door must be isolated from the latching and locking systems prior to flight, and the key structural parts of flight must be able to bear the structural limit loads and ultimate loads, and the method of continuous airworthiness event monitoring based on risk management depends on adequate of monitoring data. These airworthiness requirements are interpreted in combination with actual cases, which will be of great help to engineers. Based on this, taking the accident investigation report of United Airlines flight 811 as the blueprint, and according to the current domestic airworthiness regulations and normative documents, this paper used the method of analytical interpretation to study the exposed problems. The results showed that the design of the driving system of the front cargo compartment latch of flight 811 did not meet the airworthiness requirements that it was necessary to disconnect the latch before flight and could not restore power to the cabin door during flight; The design of L-shaped anchor for the front cargo hold door of flight 811 did not meet the requirements of load design and verification in airworthiness regulations; The FAA made mistakes in its assessment of the safety impact and airworthiness risk level of the opening of the front cargo hold door of the aircraft in flight. The content of the article can be used as a reference for aircraft door researcher and aircraft continuous Airworthiness researcher.