Commonwealth legislation

AD/LYC/81 Amdt 3 - Oil Pump Impellers

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legislative instrument

Plain English Summary

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Requires replacement of sintered iron oil pump impellers in specified Lycoming piston engines, excluding certain 540 wide‑deck and listed 76‑series models. It affects aircraft owners/operators, maintenance organisations and certificating authorities by imposing mandatory part replacement at the next overhaul, bulk strip, by 31 December 1995, or before installation/issue of an Australian Certificate of Airworthiness. Owners pay for the replacement, maintenance organisations perform the work, and CASA enforces compliance (Requirement; Compliance; Applicability).

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AD/LYC/81 Amdt 3 - Oil Pump Impellers

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Lycoming Piston Engines

AD/LYC/81

Amdt 3

Oil Pump Impellers 3/95

Applicability: All Lycoming piston engines other than; dual magneto 540 wide deck series engines built with high capacity oil pumps and O-320-H2AD, O-360-E1A6D, LO-360- E1A6D, TO-360-E1A6D and LTO-360-E1A6D 76 series engines.

Requirement: Replace scintered iron oil pump impellers in accordance with Textron Lycoming Service Bulletin No. 456F.

Compliance: Effective 2 March 1995: Unless previously accomplished in accordance with a previous issue of SB 456;

At next engine overhaul, bulk strip or 31 December 1995, whichever occurs first.

2. Prior to installation in an aircraft.

3. Prior to issue of an Australian Certificate of Airworthiness.

Note: Previous compliance with the requirements of this Directive can be established by a review of the engine log books and/or engine records.

Background: This Directive requires the replacement of sintered iron oil pump impellers in certain Lycoming engines. This amendment has been issued to reflect industry advice that the 76 series engines have a different oil pump and are therefore, not applicable. The amendment also includes a sunset clause in the compliance requirements. The change to the compliance requirements reflects advice of a recent major engine failure in a Cessna 172M/O-320-E2D. The engine had been last overhauled in the USA in 1986 and an investigation of the oil system related failure revealed sintered iron oil pump impellers were fitted.

Source text

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

1 AD/LYC/81 Amdt 3 - Oil Pump Impellers