Commonwealth legislation

AD/BEECH 90/12 - Ammeter Lead Circuit Protection

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This Act has been repealed and is no longer in force. It is retained for historical reference.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

2/10 complexity

What this is: A mandatory safety directive (called an Airworthiness Directive) issued by the Civil Aviation Safety Authority.

Who it affects: Owners and operators of Beechcraft 90 and 65-90 (King Air) series aircraft — specifically all models of these twin-turboprop planes.

What it requires: You must install a circuit protection device (like a fuse or circuit breaker) on each ammeter lead (the electrical wire that carries current measurements) near the shunts (devices that measure electrical current). This prevents electrical fires or damage if the wiring shorts or overloads.

When: Immediately (the directive uses the term "Forthwith," which means without delay).

Why it matters: Unprotected ammeter wiring can overheat and cause in-flight electrical fires or instrument failure. This is a critical safety fix to prevent catastrophic failures in these specific aircraft.

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AD/BEECH 90/12 - Ammeter Lead Circuit Protection

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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 Beechcraft 90 and 65-90 (King Air) Series Aeroplanes

AD/BEECH 90/12 Ammeter Lead Circuit Protection 11/67

Applicability: All models.

Requirement: Install a suitable circuit protection device in each ammeter lead near the shunts. Compliance: Forthwith.

Source text

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