AD/ELECT/54 - Sealed Lead Acid Aircraft Batteries

Overview

The Civil Aviation Regulations 1998, specifically under Part 39, includes Airworthiness Directives (ADs) designed to address safety concerns related to aircraft components. One such AD, AD/ELECT/54, pertains to sealed lead acid aircraft batteries manufactured by Gates Varley/Tungstone Energy Products/Hawker Energy Products. This directive was introduced to tackle the issue of unexpected loss of capacity in certain batteries, which could critically affect emergency services during power failures. The policy objective is to ensure the continued airworthiness of aircraft by mandating regular capacity testing and maintenance of specified battery types to prevent potential safety hazards. The regulations are enacted by the Civil Aviation Safety Authority and are subject to enforcement by the Commonwealth of Australia.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 107 Civil Aviation Safety Authority Schedule of Airworthiness Directives for Electrical Equipment, mandates strict compliance for sealed lead acid aircraft batteries produced by Gates Varley, Tungstene Energy Products, and Hawker Energy Products. This legislation applies to all installed batteries listed under the directive, including 18 AH and 25 AH batteries with particular product and serial numbers, and affects aircraft such as the BAe 125 Series, Shorts Skyvan Series, and BAe Jetstream series. The directive requires these batteries to be removed from the aircraft and subjected to a capacity test in accordance with the aircraft maintenance manual or an approved procedure. Compliance involves testing the batteries at intervals: initially six months after installation and then every three months for certain serial number ranges, while others require testing six months after installation and then again after a further six months before proceeding to three-monthly intervals. This regulation ensures the reliability and safety of aircraft electrical systems by addressing the issue of unexpected capacity loss in the batteries, which could compromise emergency power availability.

Key Provisions

The Civil Aviation Regulations 1998, specifically under Part 39 - 107, impose stringent requirements on the maintenance and testing of sealed lead acid aircraft batteries used in certain aircraft models. Section AD/ELECT/54 mandates that all installed Gates Varley/Tungstone Energy Products/Hawker Energy Products sealed lead acid batteries of 18 AH and 25 AH types, identified by specific product numbers and serial ranges, must undergo capacity testing. The batteries in question are used in aircraft such as the BAe 125 Series, Shorts Skyvan Series, and BAe Jetstream series. The requirement to remove these batteries from the aircraft and conduct a capacity test is outlined to ensure that the battery's ability to power emergency services is not compromised, given past instances of unexpected capacity loss. Under the Civil Aviation Regulations, operators of aircraft equipped with these batteries are obligated to adhere to strict timelines for the initial and subsequent capacity tests. For certain serial ranges, batteries must be tested 6 months after initial installation, and thereafter at intervals not exceeding 3 months. For other serial ranges, the first test is required 6 months after installation, followed by a second test 6 months later, with subsequent tests scheduled at intervals not exceeding 3 months. This testing regime is intended to ensure the reliability and safety of the battery systems in use. Failure to comply with these regulations can lead to significant consequences. While the specific penalties for non-compliance are not detailed in the provided text, it is generally understood that breaches of Civil Aviation Regulations can result in enforcement actions, fines, and potential grounding of the aircraft until compliance is achieved. These measures are in place to uphold the high safety standards mandated by the Civil Aviation Safety Authority.