Commonwealth legislation

AD/B767/2 - Ram Air Turbine, Rotary Actuator - Replacement and Test

In ForceCTH

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Commonwealth

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legislative instrument

Plain English Summary

3/10 complexity

Requires Boeing 767 aeroplanes fitted with ram air turbine rotary actuator P/No. S258T711-3 to replace it with P/No. S258T711-4 and to test the ram air turbine deployment system in accordance with Boeing Service Bulletin 767-29-17 (or later approved revision). Compliance was set before 31 July 1985. The directive targets a moisture/freezing failure mode that can immobilise the actuator brake; it creates a direct replacement-and-test obligation for affected operators, with associated parts, labour and scheduling costs.

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AD/B767/2 - Ram Air Turbine, Rotary Actuator - Replacement and Test

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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 Boeing 767 Series Aeroplanes

AD/B767/2 Ram Air Turbine, Rotary Actuator - Replacement and Test

Applicability: All models equipped with ram air turbine rotary actuator P/No. S258T711-3.

3/85

Requirement: 1. Replace ram air turbine rotary actuator P/No. S258T711-3 with rotary actuator P/No. S258T711-4.

Test ram air turbine deployment system in accordance with Boeing Service Bulletin 767-29-17, Revision 2, dated 29 June 1984 or later approved revision.

Note: FAA AD 84-25-03 Amdt 39-4969 refers.

Compliance: Before 31 July 1985.

Background: Moisture accumulation on the rotary actuator brake assembly can, under freezing conditions, cause the brake rotor to freeze to the brake armature, thus rendering the ram air turbine deployment system inoperative.

Source text

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