ASN Wikibase Occurrence # 200751
This record has been locked for editing.
Narrative:On 26 November 2016 at about 13:29 hrs Sydney time (10:29 Singapore Local Time), the Boeing 787-9 aircraft departed Sydney for Singapore.
Boeing 787-9 Dreamliner
|Fatalities:||Fatalities: 0 / Occupants: 351|
|Aircraft damage:|| Minor|
|Location:||near Singapore-Changi International Airport (SIN/WSSS) -
|Nature:||Passenger - Scheduled|
|Departure airport:||Sydney-Kingsford Smith International Airport, NSW (SYD/YSSY)|
|Destination airport:||Singapore-Changi International Airport (SIN/WSSS)|
|Investigating agency: ||TSIB Singapore|
|Confidence Rating:|| Accident investigation report completed and information captured|
During the climb following take-off, the flight crew noticed that the vibration of the Low Pressure (LP) section of the No. 2 Rolls Royce Trent 1000 engine was 3.8 units. After the aircraft had entered the cruise phase, the vibration decreased to 1.4 units.
During cruise, the aircraft climbed on two occasions. The No. 2 engine LP vibration increased to 4.0 units during the first climb and to 3.4 units during the second climb. During these periods, the flight crew did not feel any significant increase in vibration from the cockpit. After each of these two climbs, when the aircraft resumed level flight, the vibration decreased to about 1.8 to 2.0 units. As these vibration values were within limits and all other engine parameters appeared normal, the flight crew continued with the flight and monitored the engine vibration values and other engine parameters.
During the descent to Singapore Changi Airport, the flight crew heard a loud bang and noticed that the No. 2 engine had shut down automatically. They also saw the caution message "ENG TURB DAMAGE R" on the Engine Indicating and Crew Alerting System (EICAS) and noted that there was no engine fire alert. The flight crew declared an emergency to the Singapore air traffic control (ATC).
Following the loud bang, a passenger informed a cabin crew member that there was a fire at the No. 2 engine and this piece of information was relayed to the flight crew. The Second Officer went into the cabin to view and assess the condition of the engine. He did not see any fire on the No. 2 engine. Nonetheless, the flight crew requested the ATC to arrange for the airport rescue and firefighting service to stand by at the aircraft’s landing at Changi Airport.
The ATC cleared the aircraft to land on runway 02C. The aircraft landed safely at 18:42 hrs. The airport rescue and firefighting service attended to the aircraft after the landing and confirmed that there was no fire on the No. 2 engine. The flight crew then taxied the aircraft to the assigned parking bay and the passengers disembarked via an aerobridge. There were no injuries to any persons.
Inspections by the ground maintenance personnel revealed the following damage within the No. 2 engine: (a) One blade from the first stage of the Intermediate Pressure (IP) compressor was missing; (b) One variable inlet guide vane was missing; (c) Some metal debris pieces were embedded in the interior of the engine; and (d) The trailing edges of a number of fan blades were damaged.
The engine manufacturer looked into the possibilities of the cracks having been caused during the blade manufacturing process, by material defect, or by excessive stress at the blade roots, but could not find any related evidence.
The blade root cracks were probably a result of material fatigue. Once the crack was formed, the cyclical application of force in the engine environment then caused the failure of the blade root.
It is still unknown how the cracks at the IP compressor blade roots were initiated. The engine manufacturer is still conducting research to determine this. The cause of the LP vibration during the climb following take-off and during cruise cannot be determined. There is no evidence to suggest that the LP vibration was related to the cracks at the IP compressor blade roots.
| || |
|Investigating agency: ||TSIB Singapore |
|Status: ||Investigation completed|
|Download report: || Final report|
Safety recommendation RA-2017-034 issued 23 October 2017 by TSIB Singapore to Rolls Royce
Safety recommendation RA-2017-035 issued 23 October 2017 by TSIB Singapore to EASA
||Updated [Source, Narrative]|
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