All changes to tower
| Date | Change | Source |
|---|---|---|
| 27 Jan 2017 | 1-6: nominal added | David Kelly via e-mail |
| 10 Dec 2011 | 1-6: frame id added; 2-6: turning added; frame info added | John Baldwin via database |
| 31 Oct 2008 | PN info amended (from Tue) | David Floyd via e-mail |