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B 767 engine fire investigations - Safety Recommendations issued by ANSV now approved by FAA USA as investigation narrows end
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The event of July 16th, 2004 when a B767-300ER, registration marks EI-CXO suffered an engine fire during take off, has been investigated by ANSV.
During the month of August 2004 a number of laboratory tests, FDR data retrieval and analysis were conducted in house by ANSV at the Technical Laboratory facility and further specialized test have been conducted at the National Transportation Safety Board (NTSB-USA) facility in Washington on specific aircraft parts. The NTSB USA has been actively participating in the investigation under ICAO Annex 13 in the capacity of the State of Manufacture of the engines and the aircraft.
Efforts have been made to determine the causes for the rupture of a flexible pipe leading to substantial fuel leak in engine n. 2 cowling area, thus originating the fire and subsequent over weight emergency landing of the crippled aircraft. The Pratt & Whitney - PW 4062 engine powers a large aircraft fleet world wide and more than 2000 such engines are presently in operation.
On September 7th, 2004 the Agency was able to determine the causes for the rupture originating the event and therefore three specific urgent Safety Recommendations were issued to the address of the Federal Aviation Administration - FAA of the USA. The scope of the recommendations dealt with suggesting the adoption of a specific test and modification program for all engines of the same type. In detail the suggestion specified certain flexible pipes installation criteria and procedures and the modification of inspection procedures during periodic maintenance. Consequently, the Manufacturer was directed to modify and update the relevant maintenance procedures and the manuals where they are described.
The preventative maintenance suggested by the ANSV has been fully endorsed by the FAA which issued a first notice on February 18th, 2005 followed by a specific Service Bulletin (PW4ENG 72-773) on April 7th, 2005.
Maintenance manuals amendment will become effective by the end of next September.
See attached photographic documentation.
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