AIRWORTHINESS DIRECTIVE
For the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/ALF/14 Amdt 2 and issues the following AD under subregulation 39.1 (1) of CAR 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.
AlliedSignal (Lycoming) Turbine Engines - ALF502 and LF507 Series
AD/ALF/14
Amdt 3
Engine Oil System Health Monitoring 8/2001
Applicability: AlliedSignal ALF 502L, ALF502R, and LF507 series engines installed in Canadair CL-600, BAe 146, and Avro RJ series aircraft.
Requirement: 1. Carry out oil system health monitoring in accordance with AlliedSignal Service Bulletins (SB) LF 507-1H 79-5, LF507-1F 79-5, ALF502L 79-0171, and
ALF502R 79-9 for LF507-1H, -1F, ALF502L and ALF502R series engines as appropriate.
Where the service bulletins require:
(a) magnetic chip detector (MCD) debris be left to accumulate on the detector for assessment of a debris accumulation rating, it is permissible to remove the MCD debris for material analysis provided a record of debris accumulation is kept for subsequent assessment per the service bulletin requirements,
(b) a scavenge oil temperature check be carried out, it is permissible to use the procedures specified in the respective aircraft maintenance manuals in lieu of those specified in the service bulletins.
Incorporation of an improved No.4 bearing configuration as per Honeywell (formerly AlliedSignal) SB ALF/LF 72-1030, Revision 3, dated 3 April 2001 or
SB ALF/LF 72-1040, Revision 2, dated 3 April 2001 (as applicable) is a terminating action for Requirement 1 of this Directive (Refer AD/ALF/17). Upon incorporation of the improved bearing configuration, on-going oil system monitoring reverts to the respective aircraft manufacturer’s maintenance requirements.
2. For ALF502R series engines equipped with oil filter by-pass valve, P/No 2-303- 432-01, replace or modify the oil filter by-pass valve in accordance with Avco Lycoming Textron Service Bulletin ALF502R-79-0162, Revision 2.
Note 1: CAA (UK) AD 002-09-96 and FAA AD 2000-05-14 refer.
Note 2: Incorporation of earlier versions of SB ALF/LF 72-1030 or SB ALF/LF 72- 1040 (as applicable) is also terminating action for Requirement 1 of this Directive.
AlliedSignal (Lycoming) Turbine Engines - ALF502 and LF507 Series
AD/ALF/14 Amdt 3 (Continued)
Compliance: 1. Unless previously accomplished, initiate the oil health-monitoring program within 100 hours’ time in service from 26 March 1998.
2. Unless previously accomplished, no later than 30 April 1998.
This Amendment becomes effective on 9 August 2001.
Background: A number of 4/5 bearing failures has resulted in separation of the LP turbine shaft.
One failure of the LPT shaft led to an overspeed condition that resulted in an uncontained engine failure and subsequent aircraft damage.
This amendment is issued to include the latest revisions of SBs ALF/LF 72-1030 and ALF/LF 72-1040, and reference the current FAA AD.
Amendment 2 became effective on 7 September 2000 and included an additional SB reference to expand terminating action requirements.
Amendment 1 became effective on 26 March 1998 and was issued to expand the applicability to include an additional engine model, to reference an FAA AD, to mandate the requirement to use oil filter by-pass valves previously mandated by AD/ALF/7, and to provide terminating action.
Eugene Paul Holzapfel
Delegate of the Civil Aviation Safety Authority 29 June 2001
The above AD is notified in the Commonwealth of Australia Gazette on 11 July 2001.
Overview
The Civil Aviation Safety Authority (CASA) issued Airworthiness Directive (AD) AD/ALF/14 Amdt 3 in 2001, addressing safety concerns related to turbine engines in certain aircraft. This AD was enacted under the Civil Aviation Regulations 1998 (CAR 1998) and was aimed at mitigating the risk of low-pressure turbine shaft failures in AlliedSignal (Lycoming) ALF 502L, ALF 502R, and LF 507 series engines installed in Canadair CL-600, BAe 146, and Avro RJ series aircraft. The directive mandates oil system health monitoring and specific maintenance actions to prevent unsafe conditions that could lead to uncontained engine failures. The policy objective is to ensure the continued airworthiness and safety of affected aircraft by implementing necessary corrective measures based on updated service bulletins and maintenance requirements.
Scope and Application
The Airworthiness Directive (AD) AD/ALF/14 Amdt 3 issued under the Civil Aviation Regulations 1998 by the Civil Aviation Safety Authority (CASA) applies to specific AlliedSignal ALF 502L, ALF502R, and LF507 series engines installed in Canadair CL-600, BAe 146, and Avro RJ series aircraft. The directive requires the implementation of an oil system health monitoring program as outlined in AlliedSignal Service Bulletins and mandates the replacement or modification of certain oil filter by-pass valves for ALF502R series engines. This AD is applicable within the Commonwealth of Australia, as notified in the Commonwealth of Australia Gazette. The AD revokes the previous Amendment 2 and incorporates the latest revisions of specified service bulletins, aligning with current international directives from the UK Civil Aviation Authority and the Federal Aviation Administration. The AD is effective from 9 August 2001, providing a clear timeframe for compliance and addressing safety concerns identified in previous engine failures.
Key Provisions
The Airworthiness Directive (AD) AD/ALF/14 Amdt 3 primarily focuses on the maintenance and monitoring requirements for AlliedSignal ALF 502L, ALF502R, and LF507 series engines installed in certain aircraft. The AD applies to engines installed in Canadair CL-600, BAe 146, and Avro RJ series aircraft (section 1). The directive mandates that specific actions be taken to address potential unsafe conditions identified with these engines (section 2). The requirement section (section 3) outlines the detailed actions that must be performed, including oil system health monitoring as specified in various AlliedSignal Service Bulletins (SBs), the option to remove magnetic chip detector (MCD) debris for material analysis while maintaining a record of debris accumulation, and the replacement or modification of the oil filter by-pass valve in certain circumstances. The compliance section (section 4) stipulates that the oil health-monitoring program must be initiated within 100 hours’ time in service from 26 March 1998, and that any necessary actions must be completed by 30 April 1998.
The AD imposes several obligations on the entities it governs. Operators of the specified aircraft must ensure that oil system health monitoring is carried out in accordance with the AlliedSignal Service Bulletins LF 507-1H 79-5, LF507-1F 79-5, ALF502L 79-0171, and ALF502R 79-9 (section 3). This includes adhering to the specified procedures and requirements for MCD debris assessment and scavenge oil temperature checks. Furthermore, where applicable, operators must replace or modify the oil filter by-pass valve in accordance with Avco Lycoming Textron Service Bulletin ALF502R-79-0162, Revision 2 (section 3). The AD also mandates the incorporation of an improved No.4 bearing configuration as per Honeywell (formerly AlliedSignal) SB ALF/LF 72-1030, Revision 3, dated 3 April 2001, or SB ALF/LF 72-1040, Revision 2, dated 3 April 2001, which is a terminating action for Requirement 1 of this Directive (section 3).
Failure to comply with the requirements of this Airworthiness Directive may result in various civil or criminal consequences. The AD itself does not explicitly state penalties, but non-compliance with ADs can lead to enforcement actions by the Civil Aviation Safety Authority (CASA), including fines, grounding of the aircraft, or other regulatory actions. The severity of the consequences will depend on the nature and extent of the non-compliance, as well as any resulting safety implications. CASA has the authority to impose fines up to a maximum of $275,700 for breaches of civil aviation regulations, as per the Civil Aviation Act 1988. Additionally, in cases where non-compliance leads to an accident or serious incident, there may be further civil or criminal liabilities under other relevant legislation.