Overview

The Embraer EMB-110 (Bandeirante) Series Aeroplanes Airworthiness Directive (AD/EMB-110/51) was enacted as part of the Civil Aviation Regulations 1998 by the Civil Aviation Safety Authority (CASA) in 1996 to address issues related to the generator control unit (GCU) overvoltage protection circuits in these aircraft. This directive was introduced in response to reported instances of malfunctions in the voltage control and GCU overvoltage protection circuits, which could potentially lead to severe damage to the electrical and electronic systems of the aircraft, including the complete loss of generated power. The policy objective of this directive is to ensure the continued airworthiness and safety of EMB-110 Bandeirante aircraft by mandating the performance of functional tests and, if necessary, the replacement of the GCU to prevent such malfunctions. The directive requires operators to perform a functional test of the GCU overvoltage protection circuits in accordance with Embraer Service Bulletin SB 110-24-0037 dated 6 November 1995, within specific timeframes after 17 January 1996. If the GCU fails the functional test, it must be replaced before further flight. These measures are intended to detect any issues with the GCU early, thus maintaining the safety and reliability of the aircraft's electrical systems. The directive references relevant Brazilian Civil Aviation Authority (CTA) directives to ensure international alignment and safety standards are met.

Scope and Application

The Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1998, specifically Part 39 - 105, mandates the Embraer EMB-110 (Bandeirante) Series Aeroplanes Airworthiness Directive AD/EMB-110/51 concerning the generator control unit (GCU) overvoltage protection circuit. This directive applies exclusively to all EMB-110 Bandeirante aircraft, necessitating compliance with the specified requirements to ensure continued airworthiness and safety of these aircraft. The geographic and jurisdictional reach of this directive is within the Commonwealth of Australia, overseen by CASA, ensuring that all EMB-110 aircraft operating within Australian airspace must adhere to the outlined safety measures. There are no stated exclusions, exemptions, or thresholds in this directive; it applies uniformly to all aircraft within its scope. Compliance with the directive involves performing a functional test of both GCU overvoltage protection circuits within specified timeframes and replacing the GCU if it fails the functional test. The directive extends its application through subordinate instruments as referenced in Embraer Service Bulletin SB 110-24-0037 and CTA (Brazil) AD 95-11-02R1 Amdt 39-754.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, contain provisions concerning the Embraer EMB-110 (Bandeirante) Series Aeroplanes, particularly focusing on the generator control unit (GCU) overvoltage protection circuit. This directive, AD/EMB-110/51, is applicable to all EMB-110 Bandeirante aircraft and aims to address potential malfunctions that could compromise the safety of the aircraft. The directive references Embraer Service Bulletin SB 110-24-0037 dated 6 November 1995, and CTA (Brazil) AD 95-11-02R1 Amdt 39-754. The key requirements set out in this directive include performing a functional test of both generator control unit overvoltage protection circuits in accordance with the specified service bulletin. This test must be conducted within 200 hours time in service or two calendar months, whichever occurs first, after 17 January 1996, and thereafter at intervals not exceeding 600 hours time in service. Additionally, if the GCU fails the functional test, it must be replaced with a serviceable unit before further flight. The purpose of these requirements is to ensure early detection of any malfunctions that could potentially lead to damage of the aircraft's electrical and electronic systems, including the complete loss of generated power. Operators of EMB-110 Bandeirante aircraft are obligated to comply with the requirements set out in the directive. This includes conducting the specified functional tests at the prescribed intervals and replacing the GCU if it fails the test. Compliance with these provisions is crucial to maintaining the airworthiness of the aircraft and ensuring the safety of all persons on board. Failure to adhere to the requirements may result in the aircraft being deemed unairworthy, potentially leading to grounding and significant operational disruptions. Any breach of the requirements outlined in the directive may result in civil or criminal consequences. While the specific penalties are not detailed in the text, non-compliance with airworthiness directives can lead to enforcement actions by the Civil Aviation Safety Authority (CASA). Potential consequences may include fines, operational restrictions, or other regulatory measures deemed necessary to enforce compliance with aviation safety standards. It is imperative for operators to ensure that all requirements are met to avoid any adverse outcomes.