AD/BELL 412/19 - Emergency DC Bus Number One Feeder Circuit - CANCELLED

What this does: This document officially cancels a previous aviation safety rule (called an Airworthiness Directive or AD) that applied to Bell 412 helicopters.

Who it affects: Owners and operators of Bell Helicopter Textron 412 series helicopters.

What it means:

• The old rule: Back in 1988, the Civil Aviation Safety Authority required a one-time inspection or fix of the emergency DC bus number one feeder circuit (part of the helicopter's electrical system) within 100 hours of flight time.
• The change: As of 19 November 2009, that requirement is scrapped. Operators no longer need to comply with the old directive because the safety issue has been resolved or is no longer relevant.
• Why it matters: Removes an outdated compliance burden for helicopter operators.