Date:	Wednesday 29 December 2010
Time:
Type:	Airbus A330-203
Owner/operator:	Eva Air
Registration:	B-16312
MSN:	755
Year of manufacture:	2006
Engine model:	GE CF6-80E1A3
Fatalities:	Fatalities: 0 / Occupants: 79
Aircraft damage:	None
Category:	Incident
Location:	Simferopol Airport (SIP/UKFF) -   Ukraine
Phase:	En route
Nature:	Passenger - Scheduled
Departure airport:	Bangkok-Suvarnabhumi International Airport (BKK/VTBS)
Destination airport:	Vienna-Schwechat International Airport (VIE/LOWW)
Investigating agency:	ASC
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
Flight BR61 was cruising through the Simferopol Flight Information Region (FIR) at a cruising altitude of 40,000 feet when the engine air supply system suffered a failure. The cabin pressure dropped.
The crew declared an emergency (Mayday) and diverted to Simferopol for a safe emergency landing.
An investigation revealed that inside the pressure regulator sensors of Engine no.1 and no.2 air bleed systems, moisture had accumulated to water due to temperature variation in the environment. During cruise the aircraft was in an extremely low temperature environment, which led the water contained in the pressure regulator sensors to freeze. The sensors of both air bleed systems, affected in succession by icing, generated the erroneous signals of the air bleed pressure; which caused the air bleed monitor computer to erroneously regard the air bleed as over pressure and shut off the pressure regulator valve which then resulted in the occurrence.

[LINK NOT WORKING ANYMORE:http://www.asc.gov.tw/asc_ch/news_list_2.asp?news_no=424]
http://www.wing.com.ua/content/view/8401/40/
[LINK NOT WORKING ANYMORE:http://www.asc.gov.tw/asc_en/news_list_2.asp?news_no=464]

Date/time	Contributor	Updates
31-Dec-2010 15:19	harro	Added
25-Mar-2011 07:02	Anon.	Updated [Source, Narrative]
01-May-2012 12:32	harro	Updated [Source, Narrative]