TGA
TGA stands for Temperature Go Around.
If, for example, your doing a single engine approach above a certain weight and/or high OAT and/or high altitude airport, you may not have sufficient performance to carry out a go-around safely in the 'normal' go-around config. In this case there is a TGA performance chart (usually in the QRH) which will guide you to the appropriate single engine approach config and go-around flap setting in the event of a missed approach.
As an example, in the case of the A330 the normal single engine approach config is config 3 and config 2 selected for the go-around. If you are above a certain weight and/or environmental conditions then the approach would be in config 3 (as normal) but config 1+F used for any subsequent go-around.
Hope that answers your question.
Last edited by Abacus; 26th Jul 2008 at 13:13.