Emirates B772 at Moscow on Mar 6th 2011, dropped engine parts

Last Update: December 4, 2015 / 18:57:23 GMT/Zulu time

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Incident Facts

Date of incident
Mar 6, 2011

Classification
Incident

Flight number
EK-132

Aircraft Registration
A6-EMH

Aircraft Type
Boeing 777-200

ICAO Type Designator
B772

An Emirates Airlines Boeing 777-200, registration A6-EMH performing flight EK-132 from Moscow Domodedovo (Russia) to Dubai (United Arab Emirates), was departing Moscow's Domodedovo Airport when a loud bang was heard. The aircraft continued departure, the crew received a number of status messages in the following 16 minutes including: "THRUST ASYM COMP", "ENG EEC1 C1 R", "ENG EEC MODE R", "ENG R EPR BLANKING", "TURB OVHT SNSR ENG R". The flight was continued to Dubai where the aircraft landed safely with a delay of 40 minutes (departure with a delay of 10 minutes). After landing more status message occurred including "FIRE LOOP 1 ENG R" and "OVERHEAT CIRCUIT R1".

The NTSB reported, a post flight walk around showed a large section of the inboard fan duct and thrust reverser missing, starting at the trailing edge of the engine at about 9 o'clock position spanning forward about 5 feet/1.5 meters, about 2 feet/0.6 meters up to the 12 o'clock and down to the 6 o'clock position, a total of about 30-40 square feet/2.8-3.7 square meters. The primary exhaust nozzle's outer skin had completely detached, the inner skin was pentrated in several locations in the 12 to 1 o'clock position. The #12 main wheel had a large cut on its side. It is believed, that all parts of the primary exhaust nozzle were recovered from within the perimeter of Domodedovo Airport. The United Arab Emirates' Civil Aviation Authority (GCAA) is investigating.

On Dec 4th 2015 the GCAA released their final factual report without conclusion.

The GCAA reported that climbing through 400 feet AGL the crew received indication of a thrust asymmetry. The crew continued climb to safe altitude then worked the related checklist. The crew was informed by cabin crew that there had been a loud bang and sparks from the right hand engine during departure. The crew further received EICAS messages regarding the right hand electronic engine control normal mode, turbine overheat sensor, overheat circuit and engine fire loop. The related checklists were executed, the engine electronic control was switched to alternate mode. The crew requested a runway inspection at Moscow, the crew was informed that nothing had been found however. All engine parameters were subsequently normal and the flight crew continued the flight to Dubai. After landing in Dubai Dubai's tower informed the crew that he had seen small parts separate from the aircraft during touchdown and roll out. The crew shut the right hand engine down after vacating the runway. After the passengers had disembarked the commander was made aware of the missing thrust reverser parts.

The GCAA reported that Moscow's airport authority found parts of the right hand engine's thrust reverser on the runway some time after the first runway inspection.

The GCAA reported: "Each engine thrust reverser has two inner walls (left and right) that surround the aft part of the engine. These inner walls do not move. Reverse thrust is produced when movable doors, which are located aft of the two inner walls open, diverting fan bypass air forward, assisting the aircraft in reducing its speed. The inner wall (Part Number 315W5101-1) that failed was the left hand inner wall of the No.2 engine."

The GCAA stated that tests and laboratory examination revealed the inner wall failure was the result of an earlier repair that had been incorrect. The GCAA wrote: "The detailed failure analysis revealed that an earlier repair had suffered some degree of adhesion failure between the adhesive film and the earlier repaired core and concluded that the inner wall failed primarily due to residual thermal damage that was not addressed when the panel was initially inspected and repaired. The repair was not effective due to inadequate cleaning of the core prior to repair and failure to expand the repair sufficiently to remove the thermal damage."

In addition the thrust reverser may have been misrigged causing higher than normal load onto the already weakened panel.

Boeing took two safety actions as result of the occurrence, the operator replaced all thrust reverser inner walls to incorporate the modifications recommended by Boeing.
Incident Facts

Date of incident
Mar 6, 2011

Classification
Incident

Flight number
EK-132

Aircraft Registration
A6-EMH

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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