The 727s have a waste mast under the belly.
That is the way the "liquids" go...
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Reminds me of an incident with a 727-200 sometimes in the 1970s.
The waste mast is heated... obvious reason.
I do not recall the airline, irrelevant anyway.
Was (I think) somewhere in the Midwest USA...
A 727-200 was cruising, mast heater failed. Icicle grew under the belly.
Airplane started its approach down into... warmer temperatures.
Big icicle flew into nš 1 or nš 3 engine. Engine failed. FOD...
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Was some damage to the first stages of the JT8D engine.
They analysed the damage on the blades... Found traces of human feces.
So, on our crew bulletin board, a note -
"Amendment to 727 MEL. Cannot dispatch with mast heater INOP".
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One of our illustrious (PanAm) F/E added a note below...
"
Where were YOU when the !!!!! hit the fan...?"
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Happy contrails