Commonwealth legislation

AD/GOV/9 - Governor Control Arm Attachment Cap Screw A-1635-105 - Replacement

RepealedCTH

This Act has been repealed and is no longer in force. It is retained for historical reference.

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

1/10 complexity

What this is: A mandatory safety order (called an Airworthiness Directive) issued by the Civil Aviation Safety Authority (CASA). These directives are legally binding instructions to aircraft owners and operators.

What it requires: Anyone operating an aircraft with a McCauley propeller governor that uses a specific screw (Part No. A-1635-105) must replace that screw. The work must follow the manufacturer's instructions in McCauley Service Bulletin 156.

Why it matters: The screw holds the governor's control arm in place. If it fails, the control arm can separate from the governor, causing the pilot to lose control of the propeller — a serious flight safety risk.

Who must comply: Aircraft owners, operators, and maintenance organisations responsible for McCauley governors containing the affected screw.

Deadline: The replacement must be completed before the aircraft's next scheduled maintenance check (maintenance release) issued after 31 May 1985.

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AD/GOV/9 - Governor Control Arm Attachment Cap Screw A-1635-105 - Replacement

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COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source Propeller Governors

AD/GOV/9 Governor Control Arm Attachment Cap

Screw A-1635-105 - Replacement

2/85

Applicability: All McCauley Governors incorporating Part No. A-1635-105 Socket Head Cap Screws.

Requirement: McCauley Service Bulletin 156.

Compliance: Prior to issue of the next maintenance release after 31 May 1985.

Background: The Manufacturer has called for a one time inspection and replacement of this subject screw to prevent the possibility of control arm separation and loss of Governor control.

Source text

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