The FAA proposes to supersede Airworthiness Directive AD 2019-22-02 which applies to all The Boeing Company Model 747-200B 747-200C 747-200F 747-300 747-400 747-400D 747-400F 747-8F and 747-8 series airplanes. AD 2019-22-02 was prompted by reports of uncommanded fore and aft movement of the Captain's and First Officer's seats. AD 2019-22-02 requires identifying the part number and the serial number if applicable of the Captain's and First Officer's seats and applicable on-condition actions for affected seats. AD 2019-22-02 also requires a one-time detailed inspection and repetitive checks of the horizontal movement system HMS of the Captain's and First Officer's seats and applicable on-condition actions. AD 2019-22-02 also provides an optional terminating action for the repetitive actions for certain seats. Since the FAA issued AD 2019-22-02 the FAA has determined that additional seats are affected by the unsafe condition. This proposed AD would retain the actions required by AD 2019-22-02 and adds an inspection of previously omitted part numbers. The FAA is proposing this AD to address the unsafe condition on these products.