Overview

The Civil Aviation Safety Regulations 1998, administered by the Civil Aviation Safety Authority (CASA), establish and enforce regulations to ensure the safety of civil aviation in Australia. One of the legislative instruments under these regulations is the Airworthiness Directive (AD) issued to address specific safety concerns regarding aircraft and aeronautical products. For example, AD/R22/50 pertains to Robinson R22 Series Helicopters, specifically those with certain serial numbers and tail rotor pitch control assemblies, which were found to have potential safety issues due to improperly lubricated bearings. The directive, issued on 5 March 2003, mandates inspections and, if necessary, replacement of the tail rotor pitch control assembly to prevent bearing failure that could lead to loss of directional control. This directive aims to ensure the ongoing airworthiness of affected helicopters, thereby enhancing aviation safety and mitigating risks associated with identified unsafe conditions.

Scope and Application

The Airworthiness Directive (AD) AD/R22/50 issued under the Civil Aviation Safety Regulations 1998, applies to Robinson R22 Series Helicopters with serial numbers up to and including 3328, excluding serial numbers 3167, 3326, and 3327, that are equipped with a tail rotor pitch control assembly part number A031-1, Revision J or prior. The AD mandates that the tail rotor pitch control assembly be inspected for any signs of roughness or binding of the pitch control bearings by hand-rotating the pitch control bearing housing. If the housing does not rotate freely, the unserviceable pitch control assembly must be replaced with a serviceable one before further flight. The AD requires compliance within 20 hours of service after 26 March 2003 for the initial inspection, and thereafter, the inspection must be conducted at intervals not exceeding 300 hours of service or 12 months, whichever comes first. The directive became effective on 5 March 2003 and was published in the Commonwealth of Australia Gazette on the same date. The AD extends to all relevant aircraft within the specified serial numbers and does not include any exclusions or exemptions.

Key Provisions

The Civil Aviation Safety Regulations 1998, particularly Part 39 - 105, mandate the Civil Aviation Safety Authority (CASA) to issue Airworthiness Directives (ADs) for the purpose of ensuring the safety of aircraft in operation. In this instance, the AD pertains to the Robinson R22 Series helicopters (AD/R22/50), specifically addressing the tail rotor pitch control assembly (section 4/2003DM). This directive applies to Model R22 helicopters with certain serial numbers and tail rotor pitch control assemblies of specific part numbers and revisions (Applicability section). The primary requirement is to inspect the tail rotor pitch control assembly for signs of bearing roughness or binding by hand-rotating the pitch control bearing housing, as outlined in Robinson Helicopter Company Service Bulletin SB-90A Revision A (Requirement section). If the inspection reveals any issues where the housing does not rotate freely, the unserviceable assembly must be replaced with a serviceable one before further flight. The obligations under this AD are clearly defined for operators of the specified Robinson R22 helicopters. They must ensure that the inspections and any necessary replacements of the tail rotor pitch control assembly are carried out strictly in accordance with the provided instructions and within the stipulated timeframes. The initial inspection must be completed within 20 hours of time in service after 26 March 2003, and subsequent inspections must occur at intervals not exceeding 300 hours of time in service or 12 months, whichever comes first (Compliance section). This directive aims to prevent potential bearing failures that could result from undetected bearing corrosion, thereby avoiding a loss of directional control. Failure to comply with the requirements of this AD could have serious legal and safety implications. Although the specific penalties for non-compliance are not detailed in the text, under the broader framework of the Civil Aviation Safety Regulations 1998, breaches of ADs can lead to enforcement actions by CASA. These actions may include fines, enforcement notices, or other regulatory measures. In severe cases, non-compliance could also result in criminal charges, potentially leading to substantial penalties if found guilty in a court of law. Operators must adhere to these directives to ensure the continued airworthiness and safety of their aircraft.