# NTSB MIA86MA013: Mcdonnell Douglas DC-9-51, N412EA, Tampa, FL, October 19, 1985

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Major investigation · Final report
- Date: October 19, 1985, 12:35 local (16:35 UTC)
- Place: Tampa, FL
- Coordinates: 27.960912, -82.48986 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=27.9609&lon=-82.4899&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 122 uninjured
- Status: Completed
- Report: Approved by Office Director
- Safety recommendations: Yes
- NTSB case key (mKey): 31714
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MIA86MA013
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/31714/pdf
- Page: https://openairdocs.org/ntsb/MIA86MA013

## Sequence of events

In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf).

- Loss of engine power(total) - mech failure/malf, takeoff - initial climb
  - maintenance,inspection - improper, company maintenance personnel (cause)
  - maintenance,modification - improper (contributing factor)
  - combustion assembly,outer casing - fatigue (cause)

## Analysis

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.

## Aircraft

- Registration: N412EA (not matched to a registry record)
- Reported make and model: MCDONNELL DOUGLAS DC-9-51
- Category: Airplane
- Serial number: 47733
- Engines: P&W JT8D-17 16000 lbs thrust turbo fan
- Damage: Minor damage
- Flight: Part 121
- Operator: Eastern Airlines
- Registered owner: Connecticut Bank And Trust Co.
- Airworthiness certificate: Standard, Transport
- Departed: TPA
- Destination: ATL, ATLANTA, GA
- Flight plan: IFR
- Airport: TPA, Tampa Intl, runway 36R, 8,300 × 150 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 51; airline transport; airplane ratings: multi-engine land; instrument ratings: airplane; medical: unknown, unknown; seat: left; flight hours: 10,571 total, 8,295 in this make and model

## Weather

- Conditions: Visual (VMC), Day
- Wind: 90° at 9 knots
- Visibility: 12 statute miles
- Lowest ceiling: 25,000 ft broken
- Temperature: 82 °F, dew point 70 °F
- Altimeter: 30.00 inHg
- Observed at: TPA

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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