Originally Posted by
gateH15
if this is true how come I was able to use lavs during boarding on 738 and also on 320/321 many times and never had a problem. Also I don’t think I’ve ever seen lavs locked during boarding on AA.
I dod see FAs locking lavatories on other airlines on the ground.
Re-read the first sentence of my post, which you quoted in its entirety. It answers your question. I'll repost it with the relevant portion highlighted.
This is the procedure from the 737 minimum equipment list for an inoperative lavatory waste systems vacuum blower.