Serious incident McDonnell Douglas MD-83 N875RA, Tuesday 17 June 1997
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Date:Tuesday 17 June 1997
Time:17:01 LT
Type:Silhouette image of generic MD83 model; specific model in this crash may look slightly different    
McDonnell Douglas MD-83
Owner/operator:Reno Air
Registration: N875RA
MSN: 53182/2068
Total airframe hrs:10417 hours
Engine model:P&W JT8D-219
Fatalities:Fatalities: 0 / Occupants: 145
Other fatalities:0
Aircraft damage: Minor
Category:Serious incident
Location:Las Vegas, NV -   United States of America
Phase: Initial climb
Nature:Unknown
Departure airport:, NV (KLAS)
Destination airport:Colorado Spring, CO
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
Narrative:
The aircraft experienced an uncontained left engine failure during the initial climb after takeoff. The flight returned to the airport, and an uneventful landing was made. The engine was removed and returned to the repair facility that performed major repairs just 76.9 flight hours prior. During the teardown examination, the No. 5 bearing inner race retaining nut oil supply holes were found plugged. According to the Pratt and Whitney Standard Practices Manual, the procedure for the plating of silver over steel specified that the No. 5 bearing race should have been grit blasted to remove old plating per Service Process Operations Procedure (SPOP) 10, which specified use of PMC 3052-9 aluminum oxide grit. The SPOP consumable materials list identified PMC 3052-9 as 500 aluminum oxide grit. The actual processing of the nut included grit blasting with 120 grit aluminum oxide, contrary to P&W recommendation to use 200 to 500 aluminum grit oxide media or glass beads. The nut was to be cleaned and flushed after the blasting.

Probable Cause: the maintenance/overhaul facility's improper repair, which led to obstructed oil supply hole(s) at the #5 bearing inner race, then oil starvation and subsequent uncontained engine failure.

Accident investigation:
cover
  
Investigating agency: NTSB
Report number: LAX97IA209
Status: Investigation completed
Duration: 2 years and 8 months
Download report: Final report

Sources:

NTSB LAX97IA209

Revision history:

Date/timeContributorUpdates
12-Mar-2024 15:04 ASN Update Bot Added

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