Leaving Australia with bridging A

Hi,

I applied for visa 887 on Oct and bridging A was granted.

Do I need to apply for bridging B in order for me to enter Australia if I have already booked the flight to fly back on Jan.?

Has your old visa expired yet? If not then you might not need to, depending on when it does expire.

If it has expired and you are on bridging visa a then you will need to apply for bridging visa b before you go on holiday.

Has your old visa expired yet? If not then you might not need to, depending on when it does expire.

If it has expired and you are on bridging visa a then you will need to apply for bridging visa b before you go on holiday.

my 489 expires feb 2018. I will be back in Feb 17. So the 489 visa still effective when I am back.

Then you don't need to get bridging visa b. You are not actually on bridging visa a until your current visa expires. It just kinda runs in the background until needed.