Safety recommendation
NTSB Recommends FAA Action on 747 Cargo Door Lock Mechanism
Federal Aviation Administration urged to issue airworthiness directive for torque limiting devices on Boeing 747 cargo doors.
The National Transportation Safety Board has recommended that the Federal Aviation Administration issue an airworthiness directive requiring that the manual drive units and electrical actuators for Boeing 747 cargo doors have torque limiting devices. This measure is intended to ensure that the lock sectors, modified per AD-88-12-04, cannot be overridden during mechanical or electrical operation of the latch cams.
Original regulatory source: https://data.ntsb.gov/carol-main-public/sr-details/A-89-092