Air Dolomiti AT72 near Florence on Oct 3rd 2011, engine shut down in flight
Last Update: August 23, 2012 / 16:38:21 GMT/Zulu time
Incident Facts
Date of incident
Oct 3, 2011
Classification
Incident
Airline
Air Dolomiti
Flight number
EN-1885
Departure
Florence, Italy
Destination
Munich, Germany
Aircraft Registration
I-ADCC
Aircraft Type
ATR ATR-72-200
ICAO Type Designator
AT72
The flight was cancelled, the passengers were rebooked onto later flights.
Italy's ANSV rated the occurrence a serious incident and dispatched investigators on site. The crew received a failure indication of the left hand engine about one minute into the flight and subsequently shut the engine down.
In Aug 2012 Denmark's Havarikommissionen (HCL) released Tri-national Safety Recommendations as result of joint investigations into similiar occurrences in Copenhagen (Denmark), Budapest (Hungary) and Florence (Italy), which permit insight into the events. The safety recommendation states for I-ADCC, that the aircraft took off from Florence's runway 23 in a bleed off configuration. When the aircraft climbed through 400 feet AGL the master caution activated due to a left hand engine low oil pressure, which disappeared a short time later. The climb continued with one more brief indication. After the aircraft had reached acceleration height and bleed valves had been switched on, the low oil pressure indication reappeared and the inter stage turbine temperature (ITT) dropped to 0. The crew initially believed into a faulty indication as there were no other abnormal indications, but soon noticed smoke becoming visible in the cockpit and the left hand engine fire indication activating. The engine was shut down, the fire agents discharged and the aircraft returned to Florence for a safe landing on runway 05. After vacating the runway the aircraft was evacuated.
All three investigations listed these common findings:
- all events occurred during initial climb
- "the events were all due to the initial distress of a Power Turbine 1st stage rotor blade causing subsequent damages and heavy unbalance of the whole PT assembly, further unbalance of the LP rotor through No. 6 & 7 bearing housing, and final oil leakage due to breaking of No. 6 & 7 bearing compartment retaining bolts and distress of the radial transfer tubes. Fire was then originated by such a leakage in presence of hot parts"
- a crack propagated from an internal casting defect resulting in distress of the PT1 rotor blade, the propagation of the crack was according to the low cycle fatigue mechanism.
Two safety recommendations were submitted to Transport Canada and three safety recommendations to EASA.
Incident Facts
Date of incident
Oct 3, 2011
Classification
Incident
Airline
Air Dolomiti
Flight number
EN-1885
Departure
Florence, Italy
Destination
Munich, Germany
Aircraft Registration
I-ADCC
Aircraft Type
ATR ATR-72-200
ICAO Type Designator
AT72
This article is published under license from Avherald.com. © of text by Avherald.com.
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