AD/RB211/1 Amdt 4 - A.V.M. Indication and Oil Pressure Indication and M.E.L.Requirements, Procedures

Overview

The Civil Aviation Regulations 1998, which were enacted by the Parliament of the Commonwealth of Australia, serve to regulate and ensure the safety of civil aviation within Australia. Specifically, Part 39 - 106 of the Regulations, through the Civil Aviation Safety Authority Schedule of Airworthiness Directives, addresses the critical issue of engine safety and operational procedures for specific turbine engines. This legislative instrument, known as AD/RB211/1 Amendment 4, was introduced to ensure compliance with safety directives for Rolls Royce RB211 series engines, particularly those installed on Boeing 747 aircraft. The primary policy objective is to enhance the safety and reliability of these engines by providing updated maintenance and operational procedures, thereby reducing the risk of unexpected engine shut-downs and ensuring the continued airworthiness of the aircraft. The directive applies to RB211-524D4-19 series engines and mandates specific actions based on whether the aircraft has been modified to incorporate certain Rolls Royce Service Bulletins, ensuring a tailored approach to engine maintenance and safety.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 106 Civil Aviation Safety Authority Schedule of Airworthiness Directives, pertains to the Rolls Royce RB211 Series turbine engines, particularly the RB211-524D4-19 series engines. This legislation applies to aircraft that are equipped with these engines and mandates specific actions for both modified and unmodified aircraft. For aircraft modified to include Rolls Royce Service Bulletin (SB) RB211-72-7836 and Vibro Meter SB RB211-77-002, the directive requires adherence to Rolls Royce SB RB211-77-A9663, which provides updated conditional alternative operating procedures in the event of an Airborne Vibration Monitoring (AVM) system warning. This requirement is particularly relevant to Boeing 747 aircraft and is designed to reduce unnecessary engine shut-downs by allowing time to confirm the validity of AVM warnings. For aircraft that have not incorporated the aforementioned modifications, the directive mandates compliance with Rolls Royce SB RB211-77-A8446. These regulations came into effect on 18 April 1994 and are enforced to ensure the airworthiness and safety of aircraft utilising the specified Rolls Royce engines.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39, Section 106, mandates the Civil Aviation Safety Authority (CASA) Schedule of Airworthiness Directives (AD) concerning Rolls Royce turbine engines of the RB211 series, with a focus on the A.V.M. indication, oil pressure indication, and MEL requirements, as outlined in AD/RB211/1 Amendment 4 (AD/RB211/1 Amdt 4). This directive applies to RB211-524D4-19 series engines and sets out procedures for modified and unmodified aircraft. Section 1 of the directive mandates that for aircraft modified to include Rolls Royce Service Bulletin (SB) RB211-72-7836 and Vibro Meter SB RB211-77-002 on Boeing 747 aircraft, operators must follow the procedures outlined in Rolls Royce SB RB211-77-A9663 (Section 1.1). This is to implement updated conditional alternative operating procedures in the event of an Airborne Vibration Monitoring (AVM) system warning, which has been shown to slow the rate of failure progression of location bearings and reduce unnecessary engine shut-downs. In contrast, Section 2 of the directive mandates that for aircraft not modified as specified in Section 1, the operating procedures covered by Rolls Royce SB RB211-77-A8446 must be followed (Section 2.1). Operators of RB211-524D4-19 series engines must ensure compliance with the AD/RB211/1 Amdt 4 from 18 April 1994. This includes the implementation of updated conditional alternative operating procedures for modified aircraft and adherence to the specified service bulletins for unmodified aircraft. Compliance involves following the updated procedures for modified aircraft to reduce unnecessary engine shut-downs and ensuring that unmodified aircraft follow the prescribed operating procedures as detailed in Rolls Royce SB RB211-77-A8446. Failure to comply with the AD may result in the aircraft being deemed unairworthy, potentially leading to grounding and other enforcement actions by CASA. The AD/RB211/1 Amdt 4 also stipulates that failure to comply with the provisions set forth in the directive may result in civil or criminal penalties. While the specific penalties are not detailed in the text, it is known that non-compliance with Civil Aviation Regulations can result in significant fines and other enforcement actions. The severity of these penalties may vary depending on the nature and extent of the non-compliance, with potential maximum penalties including substantial fines and imprisonment for serious breaches. Operators are therefore strongly advised to adhere strictly to the AD requirements to avoid any legal repercussions.