This document cancels a previous aviation safety rule about specific aircraft altimeters.
An Airworthiness Directive (AD) is a safety order issued by the Civil Aviation Safety Authority (CASA) requiring aircraft owners to fix unsafe conditions. This particular directive originally imposed requirements on aircraft fitted with "3-pointer type altimeters" (flight instruments that display altitude using three separate hands or pointers).
What has changed:
- The directive is now cancelled (effective 25 October 2007)
- Aircraft operators and maintenance organisations no longer need to comply with the specific requirements previously set out in AD/GENERAL/47
Why it changed:
The safety concerns are now adequately covered by:
- Civil Aviation Order 103.3 (general standards for aircraft instruments)
- Standard aircraft certification requirements
Who is affected:
Owners and operators of aircraft that were previously subject to this specific directive—primarily those with older "three-pointer" altimeter designs.