AIRWORTHINESS DIRECTIVE
For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.001(1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.
Rolls Royce Germany Turbine Engines - BR700 Series
AD/BR700/5 | High Pressure Compressor Front Drum | 3/2005 |
Applicability: | Rolls Royce Model BR700-710 Engine Serial Number 11141. |
Requirement: | 1. Remove from service and discard High Pressure Compressor (HPC) front drum Part Number (P/N) BRR20378 Serial Number (S/N) 119. 2. Do not install the HPC drum removed per requirement 1. Note 1: The life limit of the affected HPC front drum, P/N BRR20378, S/N 119 is lower than the life limit for all other HPC front drums P/N BRR20378 as declared in the Time Limits Manual, Chapter 05-10-01. Rolls Royce Service Bulletin SB-BR700-72-900347 dated 03 November 2004 refers. Note 2: German LBA Airworthiness Directive D-2004-494 approved under EASA reference 2004-12661 dated 31 December 2004 refers. |
Compliance: | 1. On or before HPC front drum P/N BRR20378 S/N 119 reaching a total of 7800 flight cycles since new. 2. After the effective date of this Directive. |
| This Airworthiness Directive becomes effective on 17 March 2005. |
Background: | During rework, HPC front drum P/N BRR20378, S/N 119 was inadvertently heat treated after cold expansion of the stage 6 boltholes. It therefore lost some of the protective compressive stresses from the cold expansion. As a result of this, it is necessary to reduce the life of the affected HPC front drum, to 7800 flight cycles instead of the previously declared 10000 flight cycles. The affected HP compressor front drum is currently installed to the engine with S/N 11141. This AD addresses the identified unsafe condition associated with HPC front drum cracking and resultant uncontained engine failure. |
James Coyne
Delegate of the Civil Aviation Safety Authority
4 February 2005
Overview
The Airworthiness Directive issued by the Civil Aviation Safety Authority (CASA) in 2005 specifically targets the safety concerns related to the Rolls Royce Model BR700-710 Engine, serial number 11141, specifically addressing the issue of the High Pressure Compressor (HPC) front drum part number BRR20378, serial number 119. This directive was enacted to mitigate an unsafe condition identified during rework of the engine, where the HPC front drum was inadvertently heat treated after cold expansion, thereby diminishing its protective compressive stresses and necessitating a reduction in its operational life limit from 10,000 to 7,800 flight cycles. This action aims to prevent potential HPC front drum cracking, which could lead to uncontained engine failure, thus ensuring the continued safety and airworthiness of the aircraft involved. The directive underscores the importance of adhering to precise operational protocols to maintain the integrity and reliability of critical aeronautical components.
Scope and Application
The Airworthiness Directive issued under the Civil Aviation Safety Regulations 1998 mandates specific actions for Rolls Royce Model BR700-710 Engine Serial Number 11141, focusing on the High Pressure Compressor (HPC) front drum Part Number (P/N) BRR20378 Serial Number (S/N) 119. The directive applies to this particular engine, requiring its HPC front drum to be removed from service and discarded if it reaches 7800 flight cycles since new. Additionally, the removed HPC drum must not be reinstalled under any circumstances. This measure is necessary to address the identified unsafe condition of HPC front drum cracking, which could lead to uncontained engine failure. The directive extends to the Commonwealth jurisdiction, ensuring that all relevant parties adhere to these safety standards. The directive does not specify any exclusions or exemptions but mandates strict compliance with the outlined requirements and timeline.
Key Provisions
The Airworthiness Directive (AD/BR700/5) specifically targets the Rolls Royce Model BR700-710 Engine with Serial Number 11141, focusing on the High Pressure Compressor (HPC) front drum, Part Number BRR20378 with Serial Number 119. As per section 3 of the AD, the primary requirement is to remove and discard the specified HPC front drum before it accumulates 7800 flight cycles since new (section 3.1). The directive also explicitly states that the removed HPC drum should not be reinstalled (section 3.2). Two notes provide additional context, referencing a Rolls Royce Service Bulletin and a German LBA Airworthiness Directive.
In terms of compliance, the directive mandates that the specified action must be taken before the HPC front drum reaches 7800 flight cycles (section 4.1) and after the effective date of the directive, which is 17 March 2005 (section 4.2). The AD is issued to address an identified unsafe condition that could lead to HPC front drum cracking and uncontained engine failure, as outlined in the background section.
The AD imposes clear obligations on the operators and maintainers of the affected aircraft. They must ensure the HPC front drum P/N BRR20378, S/N 119 is removed and discarded before it reaches 7800 flight cycles. This includes conducting regular inspections and maintaining records of the flight cycles to ensure timely compliance. The directive also requires adherence to the instructions provided, ensuring the drum is not reinstalled or reused in any capacity.
Failure to comply with the AD could result in severe consequences, as it is designed to mitigate a significant safety risk. While the specific penalties are not detailed within this directive, non-compliance with ADs generally falls under the Civil Aviation Safety Authority (CASA) enforcement mechanisms. This could include civil penalties, fines, or even criminal charges if the non-compliance leads to an accident or incident. The exact penalties would depend on the circumstances of the non-compliance and any resultant harm or risk created.