Pilot Debrief

ROCKWELL INTERNATIONAL S-2R near Colquitt, GA — 2008-07-05

Final reportMIA08LA133
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Date
2008-07-05
Location
Colquitt, GA, USA
Aircraft
ROCKWELL INTERNATIONAL S-2R
Registration
N8499V
Category
Airplane
Highest injury
Minor
Fatalities
0
Phase of flight
Initial climb

Probable cause

Loss of engine power due to the installation of incorrect turbine blades on the compressor turbine disk during repair of the disk assembly.

NTSB narrative

Shortly after takeoff during an agricultural application flight, approximately 834 hours since the turbine blades were installed, the engine experienced a loss of power resulting in a forced landing. Unable to dump his chemical load due to cars on a highway, the pilot executed a forced landing in a field resulting in substantial damage to both wings. Examination of the engine revealed that during repair of the compressor turbine disk in 2005, incorrect part number Federal Aviation Administration (FAA) Parts Manufacturer Approval (PMA) turbine blades were installed in all positions of the compressor turbine disk of the accident engine. The engine was approved for return to service. One of the turbine blades failed due to fatigue causing the remaining blades to fracture due to overstress.

Analysis

Primary failure mode
Mechanical failure
First missed decision gate
Pilot could have jettisoned chemical load to reduce weight and improve control.

NTSB coding

Evidence available

  • 8 docket documents
View NTSB final reportView NTSB docket

Docket documents8

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