ANSV issues safety recommendation on An-124 engines

August 11, 2011

The Italian accident investigation bureau ANSV issued a safety recommendation regarding certain Ivchenko Progress D18T jet engines used on Antonov 124 cargo aircraft.

On September 9th 2010, at Turin-Caselle Airport, Italy, an Antonov An-124-100 (RA-82079) was taking-off from runway 36. During the take-off run, at about 50 kts, the crew experienced the engine #4 (outer right) failure followed by an uncommanded shut down. the crew rejected the take-off. During the applicalion of the thrust reversers, the crew experienced an uncommanded shut down of engine #1 (outer left) too.
The aircraft stopped safely on the runway and the emergency services on the airport approached the aircraft after witnesses saw flames and smoke from the exhaust of the engines. No aircraft or airport damages and no injuries were reported.

The engine manufacturer reported that the problem noted on engine #4 was known. A modification document had been issued which called for alterations during the next engine shop visit.  In the course of their investigation of this serious incident, ANSV concluded that this measure was insufficient and decided to issue a safety recommendation to the Russian Interstate Aviation Committee:

The serious incident occurred on Turin-Caselle airport demonstrates that engine failsafe operation on model D18T series is not guaranteed at all on the ones not yet modified.
ANSV – considering the very high MTOW of the aircraft on which D18T engine series are installed, considering the safety level of an uncommanded engine shut down during take-off on those aircraft, considering the Temporary Change 559 that is not supported by analysis related to the “fatigue progression” on HPC 5th stage (the document was issued by the Operator) recommends Interstate Aviation Committee that the modification stated on the engine Designer documents (D18T-1567 and 18T25446) must be completely carried out on each engine installed onboard an aircraft before it could be airworthy. The solution adopted by engine Designer (modification to the successive scheduled shop visit) appears to be not acceptable and not sufficient at all.

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