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NTSB Report
March 26, 1987 · Mcdonnell Douglas DC-10-10 · N151AA
Tuba City, AZ
Overview
Report Status
Preliminary report
Event Type
Incident
Date
March 26, 1987
Injury Outcomes
No injuries (173 uninjured)
Location
Tuba City, AZ
Aircraft
Mcdonnell Douglas DC-10-10
Tail Number
N151AA
Operator
American Airlines
Injuries
None
Aircraft Damage
Minor
NTSB Number
SEA87IA068
WHILE ENGAGED IN CRUISE ON A SCHEDULED TRANSCONTINENTAL FLIGHT FROM NEW YORK TO LOS ANGELES, SEVERAL STAGE 1 HIGH PRESSURE TURBINE ROTOR BLADES WITHIN THE #1 ENGINE SEPARATED WITHOUT WARNING FROM THEIR PLATFORMS. THE INITIAL SEPARATION WAS FOUND TO HAVE ORIGINATED AT A BLADE FORWARD COOLING HOLE AND WAS DETERMINED TO BE FATIGUE INDUCED. THE FATIGUE WAS MOST LIKELY BROUGHT ON BY A DEGRADATION OF THE COOLING AIRFLOW PATTERN WITHIN THE BLADE INDUCED BY AN AIRFLOW LEAK NOT ASSOCIATED WITH THE BLADE COOLING HOLES. THE BLADE SEPARATIONS RESULTED IN DISINTEGRATION OF THE HIGH PRESSURE TURBINE ASSEMBLY AND SUBSEQUENT ENGINE FAILURE.
Full Narrative
WHILE ENGAGED IN CRUISE ON A SCHEDULED TRANSCONTINENTAL FLIGHT FROM NEW YORK TO LOS ANGELES, SEVERAL STAGE 1 HIGH PRESSURE TURBINE ROTOR BLADES WITHIN THE #1 ENGINE SEPARATED WITHOUT WARNING FROM THEIR PLATFORMS. THE INITIAL SEPARATION WAS FOUND TO HAVE ORIGINATED AT A BLADE FORWARD COOLING HOLE AND WAS DETERMINED TO BE FATIGUE INDUCED. THE FATIGUE WAS MOST LIKELY BROUGHT ON BY A DEGRADATION OF THE COOLING AIRFLOW PATTERN WITHIN THE BLADE INDUCED BY AN AIRFLOW LEAK NOT ASSOCIATED WITH THE BLADE COOLING HOLES. THE BLADE SEPARATIONS RESULTED IN DISINTEGRATION OF THE HIGH PRESSURE TURBINE ASSEMBLY AND SUBSEQUENT ENGINE FAILURE.
Flight
Event TypeIncident
Event Time11:49 MST
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftMcdonnell Douglas DC-10-10
Tail NumberN151AA
Aircraft CategoryAir
DamageMinor
OperatorAmerican Airlines
Operating RulePart 121
Engines3
Engine TypeTurbofan
Engine DetailsGe · CF6-6K · Turbofan · 40000
Seats295
People & Injuries
Injury SummaryNo injuries (173 uninjured)
Fatal0
Serious0
Minor0
Uninjured173
Total173
Crew 1Age 55 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind280° @ 4 kt
Visibility75 sm
CeilingNone
Temperature / Dew Point63 F / 19 C
Altimeter30.00 inHg
Observation Time18:50
Weather SourceWFAC