Commonwealth legislation

AD/T53/18 - Gas Producer and Power Turbine Discs and Spacers

In ForceCTH

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Commonwealth

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legislative instrument

Plain English Summary

3/10 complexity

This airworthiness directive orders operators of T5313B turboshaft engines to remove specified gas‑producer (GPT) and power‑turbine (PT) discs and spacers by the timelines in FAA AD 87‑12‑05 (effective 20 July 1987). Removal is compulsory for the listed part numbers and must follow the FAA schedule.

The directive states cyclic life limits for the GPT and PT discs were reduced and new life limits set for spacers to prevent uncontained engine failures. Compliance and replacement costs fall to operators, who must track component cycles and source replacements.

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AD/T53/18 - Gas Producer and Power Turbine Discs and Spacers

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source AlliedSignal (Lycoming) Turbine Engines - T53 Series

AD/T53/18 Gas Producer and Power Turbine Discs and Spacers

Applicability: T5313B turboshaft engines.

9/87

Requirement: Remove from service: GPT disc P/N 1-100-133-01, PT disc P/N 1-140-272-01, GPT spacer P/N 1-100-294-03, PT spacer P/N 1-140-169-03, and PT spacer P/N 1- 140-169-04 in accordance with FAA AD 87-12-05 Amdt 39-5640.

Note: Lycoming SB No. 0020 Revision 2 dated 3 January 1986 refers (this is the Requirement Document of AD/T53/1 Amdt 1).

Compliance: Unless already accomplished; in accordance with the schedules detailed in FAA AD 87-12-05 Paras (a) to (e) with effect from 20 July 1987.

Background: The service cyclic life for the GPT disc and the PT second stage disc has been reduced and a cyclic life limit established for GPT and PT spacers.

This Directive is issued to assure the timely removal from service of affected components to prevent uncontained engine failures.

Source text

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