Commonwealth legislation

AD/INST/12 - SEP 6 Automatic Pilot Roll Computer Clutch Circuit - Modification

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This Act has been repealed and is no longer in force. It is retained for historical reference.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

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What this is: An Airworthiness Directive (AD) — a mandatory safety instruction issued under civil aviation law that applies to aircraft owners and operators.

Who it affects: Anyone operating an aircraft fitted with a specific autopilot component: the SEP 6 roll computer (model 83SUE3).

What you must do: Modify the clutch circuit in this roll computer. The work must follow the exact instructions in Smiths Service Bulletin 22-778 (the manufacturer's technical manual).

When to do it: Within 3,000 hours of flight time after 30 April 1975. This is calculated based on the aircraft's flight hours (time in service).

Why it matters: This modification fixes a safety defect in the autopilot's clutch circuit, ensuring the automatic pilot system can reliably control the aircraft's roll (banking/turning) without mechanical failure.

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AD/INST/12 - SEP 6 Automatic Pilot Roll Computer Clutch Circuit - Modification

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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 Instruments and Automatic Pilots

AD/INST/12 SEP 6 Automatic Pilot Roll Computer

Clutch Circuit - Modification

Applicability: SEP 6 roll computer 83SUE3. Document: Smiths SB 22-778.

Compliance: Within 3000 hours time in service after 30 April 1975.

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Source text

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