
Click to view full size photo at Airliners.net
Contact photographer Thomas Posch
What: Iran Air Boeing 727-200 en route from Chah-Bahar to Zahedan
Where: Iran
When: Oct 23rd 2009
Who: Not available
Why: While enroute, the cabin pressure dropped rapidly. Oxygen masks were deployed, and the plane began an emergency descent to height where a safe pressure could be maintained. The flight continued on to its destination and landed safely.
The crisis is speculated to be due to a malfunctioning or blocked valve in the air conditioning system.

Volotea flight V7-1368 had to return and make an emergency landing at Venice Marco Polo Airport, Venice, Italy, on July 27th.
Royal Air Maroc flight AT-981 made an emergency landing in Casablanca, Morocco, on September 9th.
Belavia Belarusian Airlines flight B2-945 had to return and make an emergency landing in Minsk, Belarus, on March 19th.