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On 25 January, an Air New Zealand Airways Boeing 737-800 was involved in an uncontained engine failure while flying at a height of about 2000 feet (600 m) when the aircraft was descending from cruising altitude during a flight from Auckland to Wellington, New Zealand. All nine crew members including two flight attendants were killed. The aircraft was flying below the published operating minimum altitude for that particular aircraft design.
After several unsuccessful attempts to re-connect the ADIRU, it was repaired, along with the rest of the aircraft, and the flight resumed. On 18 February 2003, an Airbus A330-200 was involved in a double hull breach accident whilst operating a Manila-Jakarta, Indonesia-Manila service. The aircraft was damaged beyond economic repair but was repaired and returned to service.
Airbus conducted a wide-ranging review of its ADIRU design and development to establish whether factors outside of the design and development process contributed to the faulty ADIRUs and ADIRU failures.
Airbus contacted hundreds of ADIRU operators and many of its suppliers and conducted an advanced interrogation of a number of the ADIRUs. It found no evidence of design, manufacturing, installation or maintenance activities that could have contributed to this failure. The flight test programme allowed the ADIRUs to operate under extreme dynamic conditions on a regular basis and stress them to the limit of their design capability. This was followed by rigorous analysis and manual repair of the units.
The first ADIRU to fail in airline service was the ADIRU #1 on an A330-200 aircraft which occurred in May 1999. The cabin crew reported problems in handling the unit and also noticed that the unit started acting strangely after 2 to 3 days of use. The crew aborted the flight and returned to the airport. After arrival, the crew was treated for stress. d2c66b5586