Commonwealth legislation

AD/VIPER/8 - Oil Tank and Oil Pump Drain Valves

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

3/10 complexity

The directive mandates inspection of oil tank and oil‑pump drain valve assemblies on Rolls‑Royce Viper Mk.520/521/522 engines, carried out per the referenced Rolls‑Royce service bulletin. It affects owners, operators and maintenance organisations and must be completed before 6 August 1990 for in‑service engines and before installation for spares.

Compliance (and any corrective work) is at the owner/operator’s expense; the measure prevents rapid oil loss that could cause total oil‑pressure loss and engine failure.

JSON API

Deep dive

Want the full deep dive?

Zoe can write the in-depth analysis on top of the summary above: how it works, who it affects and what each part actually does.

Current sections

Direct links to the current provisions in AD/VIPER/8 - Oil Tank and Oil Pump Drain Valves.

AD/VIPER/8 - Oil Tank and Oil Pump Drain Valves

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source
Rolls Royce Turbine Engines - Viper Series

AD/VIPER/8 Oil Tank and Oil Pump Drain Valves 9/90 DM

Applicability: Viper Mk 520, 521 and 522 engines.

Requirement: Inspect oil tank and oil pump drain valve assemblies in accordance with Rolls Royce Viper Mks 520, 521 and 522 Service Bulletin No 72-A381.

Note: CAA UK Airworthiness Directive 030-04-90 refers.

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

(2) Uninstalled engines - 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/8 - Oil Tank and Oil Pump Drain Valves