Commonwealth legislation

AD/BO 105/1 - Tandem Hydraulic Units - Water in Servo Valve

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Commonwealth

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legislative instrument

Plain English Summary

2/10 complexity

This directive requires owners/operators of BO 105 helicopters (up to serial no. 750) fitted with specified tandem hydraulic units to carry out the manufacturer’s MBB Alert Bulletin actions on those units before further flight and to avoid installing untreated spares.

It addresses a risk that water in the servo valve can freeze and block control movement; work must be done within 25 flight hours after 30 April 1986 for in-service aircraft, with costs and downtime borne by the owners/operators.

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AD/BO 105/1 - Tandem Hydraulic Units - Water in Servo Valve

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COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source Eurocopter BO 105 Series Helicopters

AD/BO 105/1 Tandem Hydraulic Units - Water in Servo Valve 4/86

Applicability: All Model BO 105 series up to and including S/No. 750 fitted with one of the following Tandem hydraulic units, Part Numbers, 105-45021, 105-45023, 105-45028,

105-83001, 105-83011, D133-3073, DSK1-30142.

Requirement: MBB Alert Bulletin No. 26.

Compliance: Within 25 hours time in service after 30 April 1986 or for spares, unless already accomplished, before installation in an aircraft.

Background: Entry of water into the servo valve and subsequent freezing of this water, when temperatures drop below freezing, may cause blocking of the controls in one direction.

Source text

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