Commonwealth legislation

AD/ALF/16 Amdt 1 - Fan Core Inlet Anti-Ice System

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

3/10 complexity

This Airworthiness Directive (AD) requires operators of AlliedSignal (Lycoming) ALF502R turbofan engines to install a fan-core inlet anti‑ice system modification by following AlliedSignal Service Bulletin ALF/LF 72‑1020 Revision 3. CASA issued the AD to address ‘‘rollback’’ — an uncommanded power reduction and loss of thrust control in certain icing conditions. Operators must carry out the modification at the next scheduled hot‑section inspection (within 10,000 cycles or by 31 December 2003). Engine owners pay for parts and installation; CASA enforces compliance by mandating the SB procedures.

JSON API

Deep dive

Want the full deep dive?

Zoe can write the in-depth analysis on top of the summary above: how it works, who it affects and what each part actually does.

Current sections

Direct links to the current provisions in AD/ALF/16 Amdt 1 - Fan Core Inlet Anti-Ice System.

AD/ALF/16 Amdt 1 - Fan Core Inlet Anti-Ice System

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source
View image in the official source
AlliedSignal (Lycoming) Turbine Engines - ALF502 and LF507 Series

AIRWORTHINESS DIRECTIVE

View image in the official source

View image in the official sourceFor the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/ALF/16 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.

Applicability: ALF502R series engines.

View image in the official sourceRequirement: Incorporate fan core inlet anti-ice system modifications in accordance with AlliedSignal Service Bulletin ALF/LF 72-1020, Revision 3, dated 19 January 2001.

Note 1: Compliance with SB ALF/LF 72-1020, Revision 2, dated 30 September 1998, satisfies the intent of this amendment to the AD.

Note 2: FAA AD 99-15-06 refers.

Note 3: AD/BAe146/75 addresses the requirements when installing modified engines on BAe 146 series aircraft.

Compliance: During any shop visit for scheduled hot section inspection, not to exceed 10,000 cycles in service after the effective date of this airworthiness directive, but no later than 31 December 2003.

This Amendment becomes effective on 12 July 2001.

Background: ALF502 engines installed on BAe146 aircraft are prone to a phenomenon known as “rollback” which is an uncommanded power reduction condition and loss of thrust control in certain icing conditions. There have been instances where simultaneous rollback occurred on multiple engines on the same aircraft.

View image in the official sourceThis amendment references Revision 3 of SB ALF/LF 72-1020 that updates procedures and parts in universal Installation Kit, Part No. 2-203-930-05, detail part numbers.

The original issue of this Airworthiness Directive became effective on 4 November 1999.

View image in the official source

Eugene Paul Holzapfel

Delegate of the Civil Aviation Safety Authority

1 June 2001

View image in the official source

The above AD is notified in the Commonwealth of Australia Gazette on 13 June 2001.

Source text

Sourced from the Federal Register of Legislation (legislation.gov.au), CC BY 4.0.

1 AD/ALF/16 Amdt 1 - Fan Core Inlet Anti-Ice System

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

AlliedSignal (Lycoming) Turbine Engines - ALF502 and LF507 Series

AIRWORTHINESS DIRECTIVE

For the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/ALF/16 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.

Applicability: ALF502R series engines.

Requirement: Incorporate fan core inlet anti-ice system modifications in accordance with AlliedSignal Service Bulletin ALF/LF 72-1020, Revision 3, dated 19 January 2001.

Note 1: Compliance with SB ALF/LF 72-1020, Revision 2, dated 30 September 1998, satisfies the intent of this amendment to the AD.

Note 2: FAA AD 99-15-06 refers.

Note 3: AD/BAe146/75 addresses the requirements when installing modified engines on BAe 146 series aircraft.

This Amendment becomes effective on 12 July 2001.

This amendment references Revision 3 of SB ALF/LF 72-1020 that updates procedures and parts in universal Installation Kit, Part No. 2-203-930-05, detail part numbers.

The original issue of this Airworthiness Directive became effective on 4 November 1999.

Eugene Paul Holzapfel

Delegate of the Civil Aviation Safety Authority

1 June 2001