A320 exhaust smell in cabin area

[sonicbum]

Originally Posted by alawax

Hi guys ,


I have question & I hope to found answer

during engine start , there are exhaust smell coming in aft of the cabin area
with engine start only ,
what is this ? and this is normal ?


Thanks

APU exhaust ingestion with tail or crosswinds. A few years back there was an OEB instructing to start the upwind engine first to avoid excessive engine exhaust gas ingestion from the APU with old ECB standard.