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Piling on the recent questions about 300 Lav service, my question is about how to manage the lav and sink during cold weather. Assume that nighttime temps dip below freezing while parked outside… should the lav and sink be drained in anticipation of below freezing overnights?

Any cold weather experience would be greatly appreciated!

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(Username Protected)-

Standard procedure in jets I've flown- if parked outside drain the lav and water if it's going to be below freezing, and then service the next day. FBOs are usually familiar with doing a lav service but leaving the tank empty overnight.