AD/B-2/9 - Main Transmission Mount - Reinforcement - CANCELLED

What this document does

This is an Airworthiness Directive (AD) — a legally binding safety rule issued by the Civil Aviation Safety Authority (CASA) for aircraft. Specifically, this document cancels an old safety rule (originally issued in 1960) that required owners of Brantly B-2 helicopters to reinforce the main transmission mount (the structure that holds the engine and rotor to the airframe).

Who it affects

• Owners and operators of Brantly B-2 series helicopters.
• In practice, this removes a regulatory burden because the modification requirement no longer applies.

Why it matters The original rule required immediate modification of the transmission mounts per Brantly Service Bulletin No. 5. Because the rule was issued in 1960 and compliance was mandatory, CASA assumes every affected helicopter has already been modified. This document formally removes the obsolete requirement, effective 4 June 2009.