Originally Posted by
electricdeathjet
Hi this is a repost from the Tech Log forum...
A320 Min Temp??
In the limitations section of the FCOM, the minimum air temperature indicated in the environmental envelope is SAT -70 C.
.....
Recently we have encountered temperatures below this, -73C at flight level 380, there were no ECAM warnings and the wings didnt fall off...
Noticed a unusual sound at -68 SAT one day. No alerts from the aircraft but system pages review showed Skin air extract valve at intermediate position indicated in amber. Study of FCOM 1 pointed at skin heat exchanger. Pulled temp. envelope only to realise that we were just outside. Within 5 minutes after returning back the indication disappeared and so did the sound.