Flight 602 · Boeing 757-232
Boeing 757-232 · Incident: partial loss of engine power (mechanical failure) en route
From Hartsfield Jackson Atlanta International Airport (ATL) to Dallas Fort Worth International Airport (DFW)
Event
- NTSB case
- ATL97IA035
- Event typeAccident: someone killed or seriously injured, or the aircraft substantially damaged (NTSB definition). Incident: an occurrence that affected or could have affected safety, short of that. Glossary
- Incident
- InvestigationHow far the investigation had got when the record was published: preliminary, ongoing, final or completed. Unknown where the source does not say. Glossary
- Completed
- API-reported fatalities
- 0 · all aircraft and ground
- Ground fatalities
- 0
- OperationWhat kind of flying it was, grouped by the rules it flew under: airline (US Part 121), air taxi and commuter (Part 135), general aviation (Part 91 and similar), military or government. Glossary
- Airline
- WeatherVisual meteorological conditions (VMC): good enough to fly by looking outside. Instrument conditions (IMC): cloud or low visibility, flying by instruments. Glossary
- Visual Meteorological Cond
Boeing 757-232
- Aircraft type
- Boeing 757
- Category
- Airplane
- RegistrationThe aircraft's tail number, such as N12345 or G-ABCD. Registrations are reissued, so the same one years apart can be a different aircraft. Glossary
- N611DL
- Operator
- Unknown
- Onboard fatalities
- Unknown
- Route
- From Hartsfield Jackson Atlanta International Airport (ATL)To Dallas Fort Worth International Airport (DFW), Dallas, TX
- Aircraft age
- Not recorded
- Flight rulesThe regulations the flight operated under: in the US, Part 91 (general aviation), Part 121 (airlines), Part 135 (air taxi and commuter) and others; for flights abroad, the NTSB's coarser commercial or non-commercial code. Glossary
- Part 121: Air Carrier
- Phase of flightThe stage of the flight when things started to go wrong: standing, taxi, takeoff, initial climb, en route, maneuvering, approach or landing. Glossary
- En route · climb to cruise
- First occurrenceThe single coded event the NTSB judges best describes what happened (records from 2008 on). Older records name the first occurrence in the sequence instead. Glossary
- Partial loss of engine power (mechanical failure)
- DamageDestroyed: beyond practical repair. Substantial: damage that affects the structure, performance or handling and normally needs major repair. Minor: less than that. Glossary
- Minor
Cause areas
- Turbine assembly › Fatigue
Approximate · Estimated position: the centre of Atlanta, GA, the place the record names. Not the accident site.
NTSB narrative
After takeoff, the left engine experienced an uncontained failure of the Stage 1 High Pressure Turbine (HPT). The airplane returned safely and made a precautionary landing. After further examination of the engine, it was determined that the 'HPT disk blade retention lug had separated because of a low cycle fatigue fracture'. Both a Service Bulletin, PW2000 A72-592, and an Airworthiness Directive, TAD 97-11-51T, were issued to address this problem in this and other Pratt and Whitney engines.
Probable cause
failure of the Stage 1 High Pressure Turbine due to a fatigue fracture in a disk blade retention lug.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record ATL97IA035
- Event ID
- 20001208X07257
- Case number
- ATL97IA035
- Dataset
- historical-pre2008
- Source SHA-256
- 89e2df6d848e7ab3b42e7d7c7a03ff403303057a26ca04c95b3ea67201c3ce74
Source notes (4)
- Unreviewed is an editorial label, not an investigation status. API-sourced is not report-checked or human-reviewed. Explicit event totals are used without summing aircraft injury tables; onboard allocation is withheld. Unknown values remain unknown. The operation category is mapped from the NTSB-reported FAR part and has not been reviewed.
- Filled from the NTSB case API where the bulk record had no value: investigation status. Values present in the bulk record are kept.
- The date is the local date, which is the same as the UTC date the NTSB stores.
- API snapshot SHA-256: 09de6ae52453157b3a7c08ed63ba5404b8126bde65f5b901d0ee786c363a15bc; retrieved 2026-09-18T17:42:43.707Z.