Blue ice (aviation)

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In aviation, blue ice is frozen sewage material that has leaked mid-flight from commercial aircraft lavatory waste systems. It is a mixture of human biowaste and liquid disinfectant that freezes at high altitude. The name comes from the blue color of the disinfectant. Airlines are not allowed to dump their waste tanks mid-flight, and pilots have no mechanism by which to do so; [1] however, leaks sometimes do occur from a plane's septic tank.

Contents

Danger of ground impact

There were at least 27 documented incidents of blue ice impacts in the United States between 1979 and 2003. [2] These incidents typically happen under airport landing paths as the mass warms sufficiently to detach from the plane during its descent. A rare incident of falling blue ice causing damage to the roof of a home was reported on October 20, 2006, in Chino, California. [3] A similar incident was reported in Leicester, UK, in 2007. [4]

Other documented incidents include:

Danger to aircraft

Blue ice can also be dangerous to the aircraft itself — the National Transportation Safety Board has recorded three very similar incidents where waste from lavatories caused damage to the leaking aircraft, [12] [13] [14] all involving Boeing 727s. In all three cases, waste from a leaking lavatory hit one of the three engines the 727 has mounted in the rear, causing a power loss. [12] [13] [14] The flights made safe emergency landings with the two remaining functioning engines; nobody was injured. Only one report specifically mentions ice, [13] while another mentions "soft body FOD" (foreign object damage), [14] indicating that the damage was caused by a relatively soft object like a bird, or even ice, as opposed to (for example) a stone or an object made of metal.

See also

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References

  1. ↑ Chandra, Neha (18 September 2018). "Fact File: Do aircraft really drop poop from sky?". India Today . Retrieved 2023-02-26.
  2. ↑ Gumz, Jondi (February 12, 2003). "Another mysterious chunk of blue ice hits". Santa Cruz Sentinel . Archived from the original on 2008-02-24. Retrieved 2007-01-04. The Living in Everyday Earth Web site reports there have been at least 27 documented blue-ice incidents nationally in the past 24 years.
  3. ↑ "Toilet ice rips hole in couple's roof". Fox News . Associated Press. October 21, 2006. Retrieved 2011-01-05.
  4. ↑ "Frozen Pee Anyone?". BBC . June 7, 2014. Retrieved 2017-07-26.
  5. ↑ Essex Church in Kensington 1887-1987: History of a Unitarian Cause p25, by Raymond Williams Archived 2011-05-17 at the Wayback Machine
  6. ↑ "'Football-sized' ice smashes home". BBC News . February 11, 2013. Retrieved 2017-07-26.
  7. ↑ Naveen, P. "Pnaen dropping 'blue ice' can be identified from radar images". Times of India. Retrieved 30 September 2024.
  8. ↑ "Meteoriet blijkt drol uit vliegtuig" . Retrieved 2016-10-31.
  9. ↑ "'I'm covered in poo': Transport Canada investigating feces falling from sky". June 2, 2018. Retrieved 2018-06-03.
  10. ↑ "Block of ice crashes through roof of house in Bristol". BBC News. November 7, 2018. Retrieved 2018-11-07.
  11. ↑ Attrino, A. G. (2024), Huge ice chunk smashes through roof of N.J. home, causes major damage , retrieved 15 June 2024
  12. 1 2 "April 30, 1974 Incident". NTSB . Retrieved 2011-04-16.
  13. 1 2 3 "April 16, 1985 Incident" (PDF). NTSB. Retrieved 2011-04-16.[ permanent dead link ]
  14. 1 2 3 "January 04, 1990 Incident". NTSB. Retrieved 2011-04-16.
  15. ↑ Derek Elley (October 14, 1992). "Blue Ice Review". Variety . Retrieved 2009-03-26.
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