ASN Wikibase Occurrence # 370190
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| Date: | Friday 2 January 2009 |
| Time: | 11:28 LT |
| Type: |  Boeing 777-232ER |
| Owner/operator: | Delta Air Lines |
| Registration: | N864DA |
| MSN: | 29736/249 |
| Engine model: | Rolls-Royce Trent 895-17 |
| Fatalities: | Fatalities: 0 / Occupants: 257 |
| Aircraft damage: | Minor |
| Category: | Serious incident |
| Location: | Atlanta Hartsfield-Jackson International Airport, GA (ATL/KATL) -
 United States of America
|
| Phase: | Take off |
| Nature: | Passenger - Scheduled |
| Departure airport: | Atlanta Hartsfield-Jackson International Airport, GA (ATL/KATL) |
| (KNRT) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The Boeing 777 airplane experienced a contained fan blade fracture in the No. 2, right, engine, a Rolls-Royce plc RB.211 Trent 895-17 turbofan, during the takeoff roll at the Hartsfield Jackson Atlanta International Aiport. The examination of the fan blade revealed it had fractured from a fatigue crack that had initiated at the intersection of the convex side aft corner of the shear key slot and bedding flank. The examination of the fan blade also revealed the plasma spray coating was deteriorated and the dry film lubricant was almost completely gone. A survey by the engine manufacturer of the operator's 777 engine usage indicated that because of the loads and lengths of the flights, the operator was operating their Trent 895-17 engines at higher thrust levels with correspondingly high fan rotational speeds, which were still within the engine's operating limits, than any other operator. The survey also indicated the operator was operating its 777 and Trent engines significantly more hours per cycle than any other Trent 895 operator. An analysis by the engine manufacturer indicated that the blade fracture was caused by a combination of the breakdown of the lubrication system and residual fatigue life usage in the blade root following the last overhaul coupled with the high operating stresses in the fan blade from the high thrust settings.
Probable Cause: The fan blade fractured due to a fatigue crack that was the result of the combination of the breakdown of the fan blade lubrication system and residual fatigue life usage following the last overhaul of the fan blade. Contributing to the fracture was the inadequate lubrication schedule established by the engine manufacturer that was not reflective of the operator's use of the engine.
Accident investigation:
 |
|
Sources:
NTSB ENG09IA002
History of this aircraft
Other occurrences involving this aircraft
| 20 May 2005 | N864DA | Delta Air Lines | 0 | London-Heathrow Airport (LHR/EGLL) |  |
sub |
| Collision with Ground support equipment | ||||||
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 25-Mar-2024 08:04 | ASN Update Bot | Added |
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