Commonwealth legislation

AD/VIPER/9 - Engine Centre Section

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

3/10 complexity

Mandates inspection of the compressor casing/centre‑section joint flange on Rolls‑Royce Viper Mk 601‑22 and Mk 520/521/522 engines, to be performed exactly per the cited Rolls‑Royce service bulletins. The requirement responds to an investigation finding flange separation (attributed to thermal‑stress pull‑out of fastener inserts) that led to turbine shaft spline failure.

It affects engine owners/operators and maintenance organisations, who must pay for and schedule the inspection—before 6 Aug 1990 for in‑service engines, or before installation for uninstalled engines.

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Current sections

Direct links to the current provisions in AD/VIPER/9 - Engine Centre Section.

AD/VIPER/9 - Engine Centre Section

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Rolls Royce Turbine Engines - Viper Series

AD/VIPER/9 Engine Centre Section 9/90

Applicability: Viper Mk 601-22 and Viper Mk 520, 521 and 522 engines.

Requirement: Inspect engine compressor casing/centre section joint flange in accordance with and as applicable:

Rolls Royce Viper Mk 601-22 Service Bulletin No 72-A173; or

Rolls Royce Viper Mk 520, 521, and 522 Service Bulletin No 72-A388.

Compliance: (1) Engines in service - Prior to 6 August 1990.

(2) Uninstalled engines - Prior to installation in an aircraft.

Background: Investigation of an engine established that the compressor casing/centre section joint had parted at the top, causing heavy bending loads on the turbine mainshaft causing spline failure. Parting of the compressor casing/centre section has been attributed to thermal stress pulling fastener inserts from the centre section.

Source text

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

1 AD/VIPER/9 - Engine Centre Section