Commonwealth legislation

AD/ATF3/2 - Exhaust Splitter Seal Bolted Flange System

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legislative instrument

Plain English Summary

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This Airworthiness Directive requires operators of specified AlliedSignal ATF3 engines to install an exhaust splitter seal bolted‑flange system per G.T.E.C. S.B. ATF3‑72‑6092 Rev.2. It applies to engines listed in the Directive and must be done at the next H.P. turbine module removal or within 200 engine‑hours or six months after 31 August 1986. The AD substitutes the earlier repetitive inspections with a modification; operators bear parts, installation and downtime costs but avoid recurring inspections.

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AD/ATF3/2 - Exhaust Splitter Seal Bolted Flange System

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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AlliedSignal (Garrett/AiResearch) Turbine Engines - ATF3 Series

AD/ATF3/2 Exhaust Splitter Seal Bolted Flange System 8/86

Applicability: ATF3-6-4C, -6A-3C and -6A-4C models with Part and Serial numbers as listed in the Requirement.

Requirement: Install exhaust splitter seal bolted flange system in accordance with G.T.E.C. S.B. ATF3-72-6092 Rev. 2.

Note: FAA AD T84-20-51 refers.

Compliance: Unless already accomplished, at the next removal of H.P. turbine module but not later than 200 engine operating hours or 6 calendar months after 31 August 1986 whichever occurs first.

Background: An ATF3 engine has experienced an uncontained failure of the 6th stage L.P. turbine rotor blades as the result of detachment of the exhaust splitter seal from the exhaust liner.

FAA AD T84-11-51 issued 25 May 1984 (superseded by FAA AD T84-20-51 October 84) instituted repetitive inspections of the stationary seal/6th stage L.P. turbine rotor for evidence of seal/rotor contact and/or looseness I.A.W. SBs A72-6090 and 6089; and the relevant engine L.M.M.s. These inspections are not necessary on engines which incorporate the splitter seal bolted flange system. This Directive is issued to prevent the possibility of an uncontained engine failure from this cause.

Source text

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

1 AD/ATF3/2 - Exhaust Splitter Seal Bolted Flange System