ASN Wikibase Occurrence # 353129
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| Date: | Friday 25 June 1999 |
| Time: | 14:40 LT |
| Type: |  McDonnell Douglas MD-82 |
| Owner/operator: | Wilmington Trust C0 |
| Registration: | N450AA |
| MSN: | 49476 |
| Total airframe hrs: | 34641 hours |
| Engine model: | P&W JT8D-217C |
| Fatalities: | Fatalities: 0 / Occupants: 141 |
| Aircraft damage: | None |
| Category: | Serious incident |
| Location: | San Diego, CA -
 United States of America
|
| Phase: | Initial climb |
| Nature: | Unknown |
| Departure airport: | San Diego, CA (KSAN) |
| Dallas, TX (KDFW) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
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 not determine a cause for the bearing failure. The number 3 bearing had accumulated 12,487 hours since new.
Probable Cause: failure 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.
Accident investigation:
 |
|
Sources:
NTSB LAX99IA230
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 09-Mar-2024 10:42 | ASN Update Bot | Added |
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