AD/RES/4 - Aerolex (Harley) Safety Belt Attachment - Inspection and Modification

Overview

The Civil Aviation Regulations 1998, enacted by the Parliament of the Commonwealth of Australia, encompass a wide array of regulatory measures to ensure the safety and efficiency of civil aviation within the country. Within this extensive framework, Part 39 specifically addresses airworthiness directives, which are critical for maintaining the safety standards of aircraft and their components. One such directive, AD/RES/4, pertains to the inspection and modification of Aerolex (Harley) safety belt attachments. This directive was introduced to address a specific safety concern related to the potential detachment of safety belt lugs from their attachment bolts due to loose steel bushes. The policy objective of this directive is to ensure that all affected safety belts are inspected and, if necessary, modified to prevent any risk of detachment during operation. The requirement outlined in AD/RES/4 mandates the inspection of all Aerolex safety belts with steel bushes staked into the belt strap terminal lugs, with a focus on ensuring the lugs cannot pull away from their attachment bolts if the bushes become loose. In cases where the lugs are found to be at risk of pulling away, the directive instructs the installation of larger steel washers under the nuts or heads on the attachment bolts. This modification is intended to enhance the security of the lug attachment while ensuring that the lugs still move freely and that the locking elements on the nuts are fully engaged on the bolt threads. Compliance with this directive is mandatory and must be achieved forthwith, underscoring the importance of maintaining stringent safety standards in civil aviation.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 107, applies to all Aerolex (Harley) safety belts equipped with attachment lugs fitted with staked-in steel bushes. This regulation is enforced by the Civil Aviation Safety Authority and is applicable to aircraft operating within the Commonwealth of Australia. The primary aim of this legislation is to ensure the safety of passengers by preventing the lugs from detaching from their attachment bolts if the bushes become loose, which could compromise the effectiveness of the safety belts. Compliance with this directive is mandatory and must be achieved forthwith. In cases where compliance with the superseded AD/GENERAL/14 has already been met, it sufficiently addresses the intent of this directive. Subordinate instruments may further extend or restrict the application of these regulations to ensure comprehensive coverage and safety compliance across the industry.

Key Provisions

The Civil Aviation Regulations 1998, specifically under Part 39 - 107, includes provisions for ensuring the airworthiness of aircraft, with AD/RES/4 focusing on the Aerolex (Harley) safety belt attachment. Section 1 of this directive mandates that all Aerolex safety belts with attachment lugs fitted with staked-in steel bushes be inspected (AD/RES/4(1)). This inspection is to ascertain that the lugs cannot pull away from their attachment bolts if the bushes should become loose. If the lugs are found to be susceptible to such movement, the directive requires the installation of suitable steel washers that are larger in outside diameter than the bush, under the nuts or heads on the attachment bolts (AD/RES/4(2)). This modification must be executed in a manner that allows the lugs to continue moving freely on the attachment bolts and ensures that the locking elements on the nuts remain fully engaged on the bolt threads. The obligations imposed by AD/RES/4 are straightforward yet critical for maintaining the safety of passengers and crew. Operators of aircraft must ensure that all applicable safety belts are inspected and, if necessary, modified as per the directive. This involves a thorough examination of each Aerolex safety belt to verify that the lugs are securely fastened and cannot detach under normal operational conditions. If the inspection reveals a potential issue, operators must take immediate action to install the specified steel washers, ensuring that the lugs remain firmly attached while allowing for necessary movement. This process must be completed without delay to maintain compliance with the regulations. Failure to comply with AD/RES/4 can lead to significant consequences. While the specific civil or criminal penalties for non-compliance are not detailed in the directive, non-compliance with airworthiness directives generally can result in severe repercussions under the Civil Aviation Act 1988. Operators found to be in breach of airworthiness regulations may face substantial fines, potential grounding of aircraft, or even criminal charges if the non-compliance is deemed to have caused harm or posed a significant risk of harm. The precise penalties would depend on the severity of the breach and the impact on aviation safety.