509 (Tynemouth) Coast Regiment RA(TA) was formed from a part of Tynemouth Heavy Regiment RA(TA), in July 1940. RHQ was placed in suspended animation in April 1944 and the batteries went to 508 Coast Regiment RA(TA). It was reconstituted in January 1947 as 405 (Tynemouth) Heavy Anti-Aircraft Regiment RA(TA).
| Jul 40 | Formed from part of Tynemouth Heavy Regiment | Sunderland, Tyne & Wear, UK |
| Jul 40 | Home Forces | Sunderland, Tyne & Wear, UK |
| Dec 42 | Sunderland Fire Command | Sunderland, Tyne & Wear, UK |
| Apr 44 | Suspended animation |
Batteries
| Jul 40 | A, B |
| Dec 40 | A, B, 312, 314 |
| Apr 41 | 264, 265, 312, 314 |
| Jun 42 | 264, 312, 314, 397 |
