seven experts from china civil aviation administration, china commercial aircraft co., ltd., china aviation development beijing aeronautical materials research institute and northwest rubber and plastics research and design institute co., ltd., visited guangzhou institute recently to carry out airworthiness.the expert group fully affirmed the testing capability of guangzhou institute, approved it to carry out relevant tests, and issued the approval release certificate / airworthiness approval label of china civil aviation administration, which officially became an enterprise certified by china civil aviation administration.