This document cancels a previous aviation safety rule that required aircraft owners and mechanics to perform hardness testing on counterweight bearing shafts found in Hamilton Standard variable-pitch propellers.
What it does:
- Cancels Airworthiness Directive (AD) PHS/8 effective 23 November 2006
- Removes the legal obligation to conduct specific inspections on these propeller parts
- States that the safety concerns which originally triggered the inspection requirement have now been "adequately addressed"
Who it affects:
- Owners and operators of aircraft fitted with Hamilton Standard variable-pitch propellers
- Licensed aircraft maintenance engineers (LAMEs) who service these propellers
Why it matters:
This directive stops a specific maintenance requirement, reducing compliance costs and inspection burden for affected aircraft operators. It indicates that the manufacturer or operational data has shown the original safety risk (likely related to shaft failure or wear) is no longer significant enough to mandate ongoing testing.