Airlock question

[Mtdesh]

I swear I looked first. So I'm doing a brown ale 1 gallon extract kit in a one gallon wine jug. Airlock only bubbled for a few days, that doesn't worry me. After the second week the airlock fell flat. The little cap inside is not being held up by co2. Does this mean air is getting into my beer? Is this common? I plan on taking a gravity reading tom

 

[user 144271]

I would not worry about it. It is normal. take you FG readings and I bet you are OK

 

[RM-MN]

No it doesn't mean air is getting into your beer. It just means that there isn't enough pressure inside the fermenter to keep the cap lifted. It wouldn't matter much it air did get in because you still have the CO2 that the yeast produced which is heavier than air so the air floats on top of the CO2 which floats on top of your beer.