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NTSB Report
October 19, 1985 · Mcdonnell Douglas DC-9-51 · N412EA
Tampa, FL
Overview
Report Status
Preliminary report
Event Type
Incident
Date
October 19, 1985
Injury Outcomes
No injuries (122 uninjured)
Location
Tampa, FL
Aircraft
Mcdonnell Douglas DC-9-51
Tail Number
N412EA
Operator
Eastern Airlines
Injuries
None
Aircraft Damage
Minor
NTSB Number
MIA86MA013
SHORTLY AFTER LIFT-OFF, THE FLT CREW HEARD A LOUD NOISE (SIMILAR, BUT LOUDER THAN A TIRE BLOW-OUT) AS THE #1 ENG FAILED.THEY SECURED THE #1 ENG, REMAINED IN THE TRAFFIC PATTERN & LANDED ON THE SAME RWY. AFTER LANDING, AN EXAM REVEALED THE COMBUSTION CHAMBER OUTER CASE, PN 616315, HAD FAILED FROM LOW CYCLE FATIGUE. THE FATIGUE HAD PROPAGATED FROM A BOLT HOLEON THE REAR FLANGE & PROGRESSED FORWARD UNTIL IT REACHED A CRITICAL LENGTH, THEN THE REMAINING FRACTURE WAS FROM TENSILE OVERLOAD. NICKEL-CADMIUM PLATING WAS FOUND IN THE FATIGUE CRACKED AREA. THE CASE WAS LAST REPLATED AFTER IT WAS MODIFIED, APRX 5152 FLT HRS PRIOR TO THE ACDNT. PRATT & WHITNEY ENGINE REPAIR MANUAL 72-42-11 PROHIBITS THE NICKEL-CADMIUM PLATING OF THE FRONT & REAR CASE FLANGE BOLT HOLES.
Full Narrative
SHORTLY AFTER LIFT-OFF, THE FLT CREW HEARD A LOUD NOISE (SIMILAR, BUT LOUDER THAN A TIRE BLOW-OUT) AS THE #1 ENG FAILED.THEY SECURED THE #1 ENG, REMAINED IN THE TRAFFIC PATTERN & LANDED ON THE SAME RWY. AFTER LANDING, AN EXAM REVEALED THE COMBUSTION CHAMBER OUTER CASE, PN 616315, HAD FAILED FROM LOW CYCLE FATIGUE. THE FATIGUE HAD PROPAGATED FROM A BOLT HOLEON THE REAR FLANGE & PROGRESSED FORWARD UNTIL IT REACHED A CRITICAL LENGTH, THEN THE REMAINING FRACTURE WAS FROM TENSILE OVERLOAD. NICKEL-CADMIUM PLATING WAS FOUND IN THE FATIGUE CRACKED AREA. THE CASE WAS LAST REPLATED AFTER IT WAS MODIFIED, APRX 5152 FLT HRS PRIOR TO THE ACDNT. PRATT & WHITNEY ENGINE REPAIR MANUAL 72-42-11 PROHIBITS THE NICKEL-CADMIUM PLATING OF THE FRONT & REAR CASE FLANGE BOLT HOLES.
Flight
Event TypeIncident
Event Time12:35 EDT
Nearest AirportTampa Intl (0nm N)
Runway36R
Runway Length8300 ft
Runway Width150 ft
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionIflt
Aircraft
AircraftMcdonnell Douglas DC-9-51
Tail NumberN412EA
Aircraft CategoryAir
DamageMinor
OperatorEastern Airlines
Operating RulePart 121
Engines2
Engine TypeTurbofan
Engine DetailsP&W · JT8D-17 · Turbofan · 16000
Seats139
People & Injuries
Injury SummaryNo injuries (122 uninjured)
Fatal0
Serious0
Minor0
Uninjured122
Total122
Crew 1Age 51 · Unknown
Conditions
ConditionsVMC
LightDaylight
Wind90° @ 9 kt
Visibility12 sm
CeilingBroken clouds 25000 ft
Temperature / Dew Point70 F
Altimeter30.00 inHg
Observation Time16:20
Weather SourceWFAC