Incident · 2008-08-06
What the record says
- Event date
- 2008-08-06
- Event type
- Incident
- Highest injury level
- No injuries
- Aircraft
- BOEING 757 (N666DN)
- Operating rule
- Part 121
- Operator
- DELTA AIR LINES, INC. Operator named in NTSB report
- Operated by (per NTSB report)
- DELTA AIR LINES INC
Probable cause
The engine experienced an uncontained release of high pressure turbine material due to fatigue cracks that occurred on four consecutive blade retainig lugs on the 2nd stage turbine hub. The cracked lugs resulted in the release of four 2nd stage turbine blades that penetrated the engine's cases and nacelle. The lugs cracked due to loss of material and resultant increase in stress load on the blade slot serrations due to excessve grit blasting when the hub was being overhauled by Delta Air Lines. Contributing to the uncontained incident was the FAA's and Pratt & Whitney's failure to act in a timely manner when another PW2037 2nd stage turbine hub was found to have multiple cracks in the blade retaining lugs.
Source: NTSB case ENG08IA038Flight crew
Certification and experience as recorded in the NTSB accident database for this event. The NTSB records these facts about the crew's flying history; GroundCheck shows them as filed, without names or identities.
| Role | Certificate | Instrument rating | Age | Medical | Flight hours |
|---|---|---|---|---|---|
| Pilot | Airline transport pilot / Commercial / Flight engineer | Airplane | 55 | Class 1 | 12,035 total · 8,120 in this make/model · 183 last 90 days |
| Co-pilot | Airline transport pilot / Commercial / Flight engineer | Airplane | 54 | Class 1 (2008-01-08) | 10,764 total · 4,214 in this make/model · 221 last 90 days |
Facts as the NTSB records them — GroundCheck adds no judgement. Preliminary records may be revised as the investigation proceeds.