HB 4312-1989
Rectangular back-up board (English Version)
- Standard No.
- HB 4312-1989
- Language
- Chinese, Available in English version
- Release Date
- 1989
- Published By
- Professional Standard - Aviation
- Latest
- HB 4312-1989
HB 4312-1989 history
- 1989 HB 4312-1989 Rectangular back-up board
