Safety recommendation
NTSB Recommends FAA Action on Cargo Door Indicators
Federal Aviation Administration urged to issue airworthiness directive for non-plug cargo doors.
The National Transportation Safety Board recommends that the Federal Aviation Administration issue an airworthiness directive for non-plug cargo doors on all transport category airplanes requiring the installation of positive indicators to ground personnel and flight crews confirming the actual position of both the latch cams and locks, independently.
Original regulatory source: https://data.ntsb.gov/carol-main-public/sr-details/A-89-093