HB 993-1989
elevation column (English Version)
- Standard No.
- HB 993-1989
- Language
- Chinese, Available in English version
- Release Date
- 1989
- Published By
- Professional Standard - Aviation
- Latest
- HB 993-1989
- Replace
- HB 993-1974
HB 993-1989 history
- 1989 HB 993-1989 elevation column
- 1970 HB 993-1974 elevation column
