Commonwealth legislation

AD/VIPER/7 - Oil Tank Drain Valve

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legislative instrument

Plain English Summary

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This directive mandates inspection of the oil‑tank drain valve assembly on Rolls‑Royce Viper Mk 601‑22 engines per Rolls‑Royce Service Bulletin No. 79‑A4. It affects owners, operators, maintenance providers, and anyone installing these engines.

Effective 12 July 1990, in‑service engines had to be inspected by 20 July 1990, and any engine must be inspected before installation. The check aims to detect oil‑leakage risks that could cause rapid oil loss and engine failure; owners/operators bear inspection and repair costs.

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AD/VIPER/7 - Oil Tank Drain Valve

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/7 Oil Tank Drain Valve 7/90

Applicability: Viper Mk 601-22 engines.

Requirement: Inspect oil tank drain valve assembly for leakage in accordance with Rolls Royce Viper Mk 601-22 Service Bulletin No 79-A4.

Note: CAA (UK ) Airworthiness Directive 015-04-90 refers.

Compliance: Effective 12 July 1990:

(1) Engines in service \- Prior to 20 July 1990.

(2) Prior to installation in an aircraft.

Background: Failure to detect oil leakage at the oil tank drain valve may result in total loss of oil pressure. Investigation of a total loss of oil pressure on a test flight following engine installation, revealed that the oil tank drain valve cap was not in position and the drain valve was stuck open allowing a rapid loss of oil tank contents.

Source text

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

1 AD/VIPER/7 - Oil Tank Drain Valve