Xinhua News Agency, Nanning, March 25th. At present, one black box of the crashed passenger plane of China Eastern Airlines has been found, and the other is under full search.
Black box (flight data recorder) decoding is an important link in investigating the cause of air crashes.
What are the conditions for downloading the recorder data?
How long does it take for the initial reading and analysis of the data?
When will the relevant analytical data be repaired and derived?
On March 25, Mao Yanfeng, director of the Civil Aviation Accident Investigation Center, gave an answer at a press conference on the handling process after the black box was found.
What are the conditions for downloading the recorder data?
According to Mao Yanfeng, the recorder is mainly composed of a data storage unit, a circuit board, and an underwater positioning beacon.
Data is recorded in memory chips in data storage units, and most recorders have solid-state memory chips in their data storage units.
Loggers require power supply and dedicated download equipment and software to download data.
Loggers produced by different manufacturers have different accessories such as download devices and data cables.
What are the steps involved in the initial read analysis of the logger data?
Mao Yanfeng said that the data download of the recorder usually encounters three situations: one is that the recorder is not damaged at all; the other is that the recorder is damaged, but the data storage unit is in good condition; the third is that the recorder memory chip is damaged.
Different situations require different handling methods.
For a recorder that is not damaged at all, it is necessary to connect the recorder body to the dedicated download device and power supply, and then power on the recorder after confirming that the connection is correct; after power-on, use the dedicated download device to download data, and then use the dedicated decoding software. Analyze the downloaded data.
If the recorder is damaged, whether it is the appearance or the recorder circuit board and other components, but the data storage unit is in good condition, then the data download needs to first remove the data storage unit from the damaged recorder, and after cleaning and inspection, take out the storage unit. chip, check the memory chip.
If the appearance of the memory chip is intact, install the memory chip into another intact recorder of the same type, and then follow the normal recorder data download steps.
If it is found that the memory chip of the recorder is damaged, usually according to the recorder manufacturer's suggestion, the memory chip needs to be returned to the recorder manufacturer for chip repair.
When will the relevant analytical data be repaired and derived?
Mao Yanfeng said that the cockpit voice recorder found at the scene of the accident had been severely damaged.
The time required to download the recorder data is difficult to determine and depends on the state of the recorder.
The professional laboratory of the Civil Aviation Administration has been carrying out repair and data download work intensely since it received the recorder. It is still unclear when the download will be completed and the data analysis work will be carried out.
(Reporter: Lin Fanshi)