Pilot Debrief

Cessna 402 near Boise, ID — 2019-07-22

Final reportANC19LA039
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Date
2019-07-22
Location
Boise, ID, USA
Airport
BOI
Aircraft
Cessna 402
Registration
N7947Q
Category
Airplane
Highest injury
None
Fatalities
0
Phase of flight
Landing

Probable cause

A ductile overstress fracture failure of the right main landing gear bell crank assembly pivot bolt, which resulted in a collapse of the right main landing gear.

NTSB narrative

The pilot reported that, during the landing approach, he selected the landing gear selector switch to the down position, which was followed by "three greens," indicating that the landing gear was down, locked, and safe for landing. He noted that all three occupants verified and verbally confirmed that the landing gear was "down and locked." The airplane landed uneventfully, but as the pilot started a left turn onto the taxiway, the right main landing gear collapsed, and the right wing struck the ground, sustaining substantial damage. A postaccident examination of the landing gear system revealed that the right main landing gear assembly bell crank pivot bolt had sheared and displayed features consistent with a ductile overstress fracture from shear loading.

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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