AIRAC是国际上划定的,以28天为一个周期的航行资料定期生效制. 2020年比较特殊,共有14个周期,分别是: 2001 2020/01/02 2020/01/29 2002 2020/01/30 2020/02/26 2003 2020/02/27 2020/03/25 2004 2020/03/26 2020/04/22 2005 2020/04/23 2020/05/20 2006 2020/05/21 2020/06/17 2007 2020/06/18 2020/07/15 2008…