Pilot Debrief

PIPER PA 18-150 near Chugiak, AK — 2017-04-30

Final reportANC17LA022
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Date
2017-04-30
Location
Chugiak, AK, USA
Airport
PABV
Aircraft
PIPER PA 18-150
Registration
N82563
Category
Airplane
Highest injury
None
Fatalities
0
Phase of flight
Landing

Probable cause

A fracture and collapse of the main landing gear. Contributing to the accident was corrosion to the hydrasorb lug fitting.

NTSB narrative

The pilot was landing the airplane on a gravel runway when the right main landing gear collapsed; subsequently, both wings struck the ground. A postaccident examination revealed that the outer radius of the attaching lug on the extension tube that connected the wheel axle to the left main landing gear shock unit was fractured at the shock unit attachment. Visual examination of the fractured lug fitting revealed a flat fracture surface that was perpendicular to the long axis of the fitting, which had extensive evidence of rust and pitting throughout the circumference of the fitting.

Analysis

Primary failure mode
Mechanical failure

NTSB coding

Evidence available

  • Photos
  • 4 docket documents
View NTSB final reportView NTSB docket

Docket documents4

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