Commonwealth legislation

AD/TFE 731/17 - L.P. Turbine Third Stage Rotor Disc

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

3/10 complexity

Mechanically, this airworthiness directive requires operators to remove specific L.P. turbine third-stage rotor discs (P/N 3074756-1/-2; serial numbers listed in AlliedSignal Service Bulletin TFE731-72-3387) from service within 100 flight hours after 10 May 1989. It affects operators of TFE731-series engines, who bear inspection, removal and replacement or rework costs; the manufacturer identified a 0.020‑inch oversize outside diameter and advised inspection, rework and reidentification can be done by fitting shorter blades (Requirement; Compliance; Background).

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Current sections

Direct links to the current provisions in AD/TFE 731/17 - L.P. Turbine Third Stage Rotor Disc.

AD/TFE 731/17 - L.P. Turbine Third Stage Rotor Disc

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 - TFE731 Series

AD/TFE731/17 L.P. Turbine Third Stage Rotor Disc 7/89 DM

Applicability: TFE 731 series engines which may have suspect L.P. turbine third stage rotor disc part number 3074756-1/-2 whose serial numbers are listed in the Requirement document.

Requirement: Remove from service specific serial numbered L.P. turbine third stage rotor disc P/N 3074756-1/-2 (part of rotor assy P/N 3074757-1) whose serial numbers are listed in Table 1 of Allied Signals (Garrett) S.B. TFE 731-72-3387.

Compliance: Unless already accomplished, within 100 hours time in service after 10 May 1989. Background: The manufacturer, in Service Bulletin TFE 731-72-3387, has advised that specific

S/No L.P. third stage turbine discs have been manufactured with the outside diameter

0.020 inch oversize. The inspection, rework and reidentification of oversize disc assemblies can be accomplished by fitting shorter blades. This Directive is issued to ensure that suspect assemblies are removed in a timely manner to prevent turbine failures occurring.

Source text

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

1 AD/TFE 731/17 - L.P. Turbine Third Stage Rotor Disc