Aviation safety issues and actions

Landing gear wheel design

Issue number: AO-2009-062-SI-01
Who it affects: Boeing 737 landing gear wheel manufacturer, operators and maintainers of Boeing 737 aircraft
Issue owner: Honeywell
Operation affected: Aviation: Other
Background: Investigation Report AO-2009-062
Date: 21 January 2011

Safety issue description

The post-2005 main landing gear wheel design had shown a susceptibility to fatigue cracking at the inner hub bearing bore shoulder radius.

Proactive Action

Action organisation: Honeywell
Action number: AO-2009-062-NSA-033
Date: 21 January 2011
Action status: Closed
The wheel manufacturer made a change to the design of new production wheel components, incorporating shot peening of the entire bearing bore area to help prevent the fatigue cracks from developing. This change was introduced at wheel assembly serial number B15419. The improved wheels were intended for delivery on new aircraft at line number 3099; scheduled for November 2009.

ATSB response:

The ATSB is satisfied that the action taken by the wheel assembly manufacturer adequately addresses the safety issue.
Current issue status: Adequately addressed
Status justification:

The wheel manufacturer has changed the design to eliminate susceptibility to cracking at this location

Last update 13 February 2014