Manx2 L410 at Isle of Man on Nov 5th 2012, rejected takeoff after being airborne
Last Update: May 9, 2013 / 15:05:12 GMT/Zulu time
Incident Facts
Date of incident
Nov 5, 2012
Classification
Report
Cause
Rejected takeoff
Flight number
NM-116
Departure
Isle of Man, United Kingdom
Destination
Blackpool, United Kingdom
Aircraft Registration
OK-ASA
Aircraft Type
Let L-410 Turbolet
ICAO Type Designator
L410
The United Kingdom's Air Accident Investigation Board (AAIB) released their bulletin into the serious incident releasing following summary:
The source of the noise heard by the crew during the takeoff was traced to damage in the gas generator and power turbine stages of the left engine, caused by a broken balance plug released from the centrifugal compressor disc. The damage sustained by the engine was not sufficient to cause a significant loss of power and therefore the usual cues for the flight crew of an engine failure, loss of power and associated yaw, were missing. The flight crew were also startled by the level of noise, as it was outside of any of their previous experience.
The commander suspected a failure of the left engine but was not certain as to what had happened. Realising that there was sufficient runway ahead to land the aircraft safely, he decided to close the power levers and abort the takeoff.
The AAIB reported that the flight data recorder was retrieved and downloaded, the data contained 76 but not the incident flight. The cockpit voice recorder did contain the incident flight, however the cockpit area microphone suffered a fault attenuating the recordings.
The day after the occurrence an inspection of the left hand engine revealed no external evidence of damage or leaks, however, when the propeller was turned manually a metallic rubbing noise was heard from the power turbine section of the engine. No other defects were identified. The left hand engine was removed from the aircraft and sent to the engine manufacturer for further analysis. The manufacturer identified a balance plug had broken and had been released from the centrifugal compressor disc. The plug had travelled along the gas path through the engine causing damage to the centrifugal compressor, the gas generator, power turbine nozzle guide vanes and turbine blades as well as 9 intermediate turbine temperature (ITT) thermocouples. The damage was insufficient to cause a significant loss of engine power. The balance plug had failed due to a fatigure crack that developed originating from the thread root of the plug's uppermost screw thread. The AAIB stated: "The engine manufacturer identified either insufficient assembly torque or ineffective securing of the plug after installation as possible causes for the balance plug becoming loose."
Incident Facts
Date of incident
Nov 5, 2012
Classification
Report
Cause
Rejected takeoff
Flight number
NM-116
Departure
Isle of Man, United Kingdom
Destination
Blackpool, United Kingdom
Aircraft Registration
OK-ASA
Aircraft Type
Let L-410 Turbolet
ICAO Type Designator
L410
This article is published under license from Avherald.com. © of text by Avherald.com.
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