American B772 at Buenos Aires on Jul 15th 2012, rejected takeoff
Last Update: December 1, 2014 / 22:46:33 GMT/Zulu time
Incident Facts
Date of incident
Jul 15, 2012
Classification
Incident
Cause
Rejected takeoff
Airline
American Airlines
Flight number
AA-900
Departure
Buenos Aires Ezeiza, Argentina
Destination
Miami, United States
Aircraft Registration
N751AN
Aircraft Type
Boeing 777-200
ICAO Type Designator
B772
Argentina's JIAAC reported the the left hand engine's (Trent 892) tail cone had detached.
On Dec 1st 2014 Argentina's JIAAC released their final report in Spanish concluding the probable cause of the incident was:
During acceleration for takeoff the warning light for the forward cargo door illuminated prompting the crew to reject takeoff. The crew subsequently taxied the aircraft to the apron, where the loss of the left hand engine's tail cone was discovered as result of the fracture of the casing of a bearing which caused a pressure increase within and subsequent detachment of the cone.
Following the rejected takeoff, while N751AN was taxiing to the apron, the crew of another aircraft reported a metallic object near the runway. A runway inspection recovered the object which was subsequently identified as the tail cone of an engine belonging to the Boeing 777-200. At that time it had already been discovered that the left hand engine's tail cone was missing on N751AN. A visual inspection of the left hand engine revealed evidence of loss of oil.
The JIAAC reported that the detachment of the tail cone did not cause any "collateral damage". The left hand engine had been installed on the occurrence aircraft in November 2010 and had since accumualted 6,744 flight hours in 791 flight cycles.
The JIAAC reported that vaporized oil originated from a pressure line, together with hot gasses the vaporized oil exited through a hole of about 1.5mm in the casing of a bearing into the tail cone of the left hand engine causing a pressure increase there, that caused deformation on fastening holes and screws and eventually resulted in the detachment of the engine's tail cone.
There had been no history of similiar failures. The design also did not cater for the possibility of the detachment of the engine's tail cone, therefore no related indication existed.
Editorial note: the report does not touch of why and how the forward cargo door indication occurred, which prompted the rejected takeoff.
Aircraft Registration Data
Incident Facts
Date of incident
Jul 15, 2012
Classification
Incident
Cause
Rejected takeoff
Airline
American Airlines
Flight number
AA-900
Departure
Buenos Aires Ezeiza, Argentina
Destination
Miami, United States
Aircraft Registration
N751AN
Aircraft Type
Boeing 777-200
ICAO Type Designator
B772
This article is published under license from Avherald.com. © of text by Avherald.com.
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