a memory unit (10) is resistant to injury to a data logging system for aircraftan integrated circuit memory, electronically erasable (38) for storing the flight data and a memory control circuit (32) are housed in a casing (60) is resistant to the pu00e9nu00e9tration and thermally insulated.the power dissipated in the interior of the envelope is reduced by an isolation circuit (48) is switched according to an external operation to potential memory integrated circuits (38)when data are transferred to the memory circuit (38), and in the process.a data protection circuit (58).located within the interior of the insulated shell (60) prohibits the operations of reading and erasure of the memory when the potential of the system falls below a level pru00e9du00e9termine.during the ongoing storage of flight data.the data stored, the oldest data are replaced by the new flight and the storage controller (32) maintains a limited deleted for determining the beginning and end of the data recorded.a power monitoring circuit (52) located at the outside of the insulated shell (60) and the memory controller (32) at the boundary disappeared after a power interruption.a portion of the memory space is used to store the address of memory location is defective (detected in the sequence of data storage, and stores the start and the end ofthe memory address of the selected parts of the data.the memory controller (32) is placed in sequence so as to blow up the positions of defective memory and position memory storage associated with the selected contentsthe data in the storage of new data.
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