Incident · 2018-09-05
What the record says
- Event date
- 2018-09-05
- Event type
- Incident
- Aircraft
- Boeing 757 (N668DN)
- Operating rule
- Part 121
- Operator
- DELTA AIR LINES, INC. Operator named in NTSB report
- Operated by (per NTSB report)
- Delta Air Lines
Probable cause
A right engine turbine uncontainment resulting from failure of the high pressure turbine (HPT) lenticular seal due to a fatigue crack originating from an overheated region at a knife edge tip. Contributing to the failure was Pratt & Whitney’s decision to introduce the temperature-resistant knife-edge coating as a new-part number lenticular seal on an attrition basis without the option to recoat existing lenticular seals, which delayed implementation of the more durable seal material into the fleet.
Source: NTSB case ENG18IA036Flight crew
No flight-crew details recorded in the NTSB accident database for this event.
Facts as the NTSB records them — GroundCheck adds no judgement. Preliminary records may be revised as the investigation proceeds.