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19990625016179I

Incident
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FAA incident report · Doug DC982 · San Diego, CA · June 25, 1999

FAA Aviation Safety Information Portal

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Date
June 25, 1999 · 14:40 local
Place
San Diego, CA
Airport
San Diego International-Lindbergh Fld
Phase of flight
To Init Climb(1st Pwr Reduct)
Operating rules
Air carrier (Part 121)
Operator
AALA
Aircraft
N450AA
NTSB investigation
NTSBLAX99IA230
Reported as
Doug DC982
Reported engine
Pratt & Whitney JT8D217C
People aboard
141
Fatal injuries
0
Pilot’s flight hours
8,000 total
N450AARegistration cancelled Jul 26, 2011 · Mcdonnell Douglas DC-9-82(MD-82)S/N 49476 · Built 1987Airframe modelMcdonnell Douglas DC-9-82(MD-82)Engine modelPratt & Whitney JT8D seriesTurbo-jet

From the FAA’s Accident/Incident Data System (AIDS), through its Aviation Safety Information Portal, as reported. The NTSB investigates accidents separately, and its record of an accident is the fuller one. The aircraft is matched to the registry by N-number and event date, checked against the reported make and model; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

What happened

The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.

The crew heard a pop after the nose wheel lifted up during rotation on takeoff and a loss of power occurred on the right engine. An emergency was declared and an uneventful landing was completed. All of the third and fourth stage turbine blades fractured at the root and no fatigue marks were noted. The second stage turbine blades fractured at 1/2 to 2/3 span. All low-pressure turbine nozzle guide vanes exhibited significant leading edge rub and had meshed with adjacent turbine blade trailing edges. The low-pressure compressor drive turbine shaft fractured approximately 25 inches aft of the low-pressure compressor. This fracture was twisted and contained a large area of displaced and galled metal; coke/carbon was observed under the galled metal. The number 3 bearing was damaged; all balls were worn with flat spots up to 1/2 the ball circumference. Spalling was evident on the inner and outer race, but no race spinning was noted. The cage was intact, but worn. No evidence of oil starvation or overheating was evident. A flow check of the oil supply system to the number 3 bearing was completed with no blockage or flow anomalies detected. An inspection by an independent laboratory could could not determine a cause for the bearing failure. The number 3 bearing had accumulated 12,487 hours since new.

As the FAA filed it

THE CREW HEARD A POP AFTER THE NOSE WHEEL LIFTED UP DURING ROTATION ON TAKEOFF AND A LOSS OF POWER OCCURRED ON THE RIGHT ENGINE. AN EMERGENCY WAS DECLARED AND AN UNEVENTFUL LANDING WAS COMPLETED. ALL OF THE THIRD AND FOURTH STAGE TURBINE BLADES FRACTURED AT THE ROOT AND NO FATIGUE MARKS WERE NOTED. THE SECOND STAGE TURBINE BLADES FRACTURED AT 1/2 TO 2/3 SPAN. ALL LOW-PRESSURE TURBINE NOZZLE GUIDE VANES EXHIBITED SIGNIFICANT LEADING EDGE RUB AND HAD MESHED WITH ADJACENT TURBINE BLADE TRAILING EDGES. THE LOW-PRESSURE COMPRESSOR DRIVE TURBINE SHAFT FRACTURED APPROXIMATELY 25 INCHES AFT OF THE LOW-PRESSURE COMPRESSOR. THIS FRACTURE WAS TWISTED AND CONTAINED A LARGE AREA OF DISPLACED AND GALLED METAL; COKE/CARBON WAS OBSERVED UNDER THE GALLED METAL. THE NUMBER 3 BEARING WAS DAMAGED; ALL BALLS WERE WORN WITH FLAT SPOTS UP TO 1/2 THE BALL CIRCUMFERENCE. SPALLING WAS EVIDENT ON THE INNER AND OUTER RACE, BUT NO RACE SPINNING WAS NOTED. THE CAGE WAS INTACT, BUT WORN. NO EVIDENCE OF OIL STARVATION OR OVERHEATING WAS EVIDENT. A FLOW CHECK OF THE OIL SUPPLY SYSTEM TO THE NUMBER 3 BEARING WAS COMPLETED WITH NO BLOCKAGE OR FLOW ANOMALIES DETECTED. AN INSPECTION BY AN INDEPENDENT LABORATORY COULD COULD NOT DETERMINE A CAUSE FOR THE BEARING FAILURE. THE NUMBER 3 BEARING HAD ACCUMULATED 12,487 HOURS SINCE NEW.

NTSB investigation

The NTSB’s investigation of this event, with its probable cause and findings. Matched to this report by N-number and date.

NTSB LAX99IA230Incident · No injuriesIncident investigationFinal reportSan Diego, CAfailure of the number three bearing. The resulting oil leak from the bearing led to coke/carbon buildup, which resulted in chafing of the turbine's low-pressure compressor drive shaft on the rear compressor seal tube and subsequent fracture of the drive shaft.Jun 25, 1999 · No damage

Other reports on N450AA · 1

Matched to the same aircraft by N-number and date.

Incident 19991007031089IClimb · St Louis, MO(-23) On flight from ord to stl during climbout, tail compartment temp hight light came on. Crew initiated emergency checklist. Light stayed on. Crew initiated an emergency landing at stl. No damage to aircraft or injuries. At gate, contract maintenance was…Oct 7, 1999