DC-10 Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Human-Machine Interface
Deviation / Discrepancy - Procedural Hazardous Material Violation; Deviation / Discrepancy - Procedural Published Material / Policy; Flight Deck / Cabin / Aircraft Event Other / Unknown; Ground Event / Encounter Other / Unknown
Aircraft Equipment Problem Dissipated; Flight Crew Overcame Equipment Problem; General Maintenance Action
Human Factors; Procedure
Normal takeoff; after rotation a loud thump was heard throughout the airframe. Same thump was heard on descent and during landing rollout.  Post flight inspection revealed Hazmat pallet was not secured in locks and was free to slide between 1L and 2L.  Possible aircraft damage and 9G net damage. The cause was the lack of loading personnel/DG (dangerous goods) personnel not ensuring pallet was locked into position. FO (First Officer) is brand new and did not inspect the locks. Reporter recommends more training of load crew/DG personnel to check all locks are engaged. DG person was in a hurry and short handed. Train FO's to inspect locks as well during DG inspection.
MD10 Captain reported a loud thump on takeoff and landing. Post flight inspection revealed Hazmat pallet was not secured for air transport.