When travelling abroad have you ever wondered where exactly things go when they're flushed down the toilet?
Rumours have flown around for years that all the waste just flies out the bottom of the plane and is left to its own devices, but fortunately modern aircrafts are designed to hold it in a tank.
This is then offloaded post-landing, but sometimes things can go wrong and the stored sewage escapes the plane, this is called "blue ice".
And there have been some cases. Just ask Andy and Gaynor Swann who were living in Stocking farm in 2007.
Andy and Gaynor were in their garden in 2006 when an 18 inch-wide block of frozen urine crashed on to their roof – just 4ft from where Andy stood.
At the time, Andy said: “There was a big bang and it hit the ridge tiles on the roof, then the patio.
“It would have killed me if it had hit me, without a doubt.”
The lump of blue ice caused hundreds of pounds of damage to their roof, scattering tiles on to the patio below.
“It looks like frozen wee. I would think it’s chemically treated, but when it thawed out on the patio it didn’t smell very pleasant.
“I find it’s quite funny now, but on Saturday I was angry to say the least."
A similar incident occurred outside the Great Glen home Stephanie Cole who was stunned when she saw a dent in the front of her black Smart car, caused by a fallen ball of ice.
The ice ball, which fell from an aeroplane, ricocheted off of her vehicle before it landed on her gravel driveway.
“It was a massive lump and could have hit someone walking past my house and killed them. It’s too scary to think about," she said.
In both cases, neither parties were compensated and had to fork out hundreds of pounds to repair the damage.
The Civil Aviation Authority (CAA) displays information on its website as to why this sometimes happens.
Within that information, it says: "Some ice falls may occur because ice which has naturally formed on an aircraft at higher altitudes breaks off as it descends into warmer air.
"We have also received reports of discoloured ice which may carry an odour. This could originate from a leak from a faulty seal on a lavatory hose socket at a servicing point on an aircraft, which is used to unload waste liquid when on the ground.
"This is sometimes referred to as 'blue ice'.
"It should be noted that all lavatory waste is held within the aircraft and collected after landing by special vehicles during the preparation for the next flight.
"If the ice is clear, it may have been due to a leak from the potable water system at an external servicing point. This system provides clean water to an aircraft’s galley and lavatory system.
"A lot of assumptions can be made, but unfortunately it is impossible to trace a piece of fallen ice to a specific aircraft if indeed that was its origin."
Ultimately, the CAA says you should report any case of a random icefall to them. You can do so by clicking here.
In some cases, some airports operate voluntary schemes under which they will repair any damage, so it may be worthwhile contacting your local airport.
Otherwise, you should contact your insurance company in relation to any claim, says the CAA
Heathrow is one of the airports to run such a scheme. On their website, it says: "Heathrow operates a 24-hour telephone service for reporting ice fall damage. If you suspect your house has sustained a strike, you should report it immediately by calling our assessor on 07513 812808."
An inspection will be carried out of the damage before free repairs are carried out.
Incidents like this are extremely rare with the number of incidents reported year to year rarely exceeding 25.
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