Commonwealth legislation

AD/BEECH 90/10 - Standby Compass Deviation Placard - Installation

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This Act has been repealed and is no longer in force. It is retained for historical reference.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

This is a mandatory safety instruction for owners and operators of Beechcraft King Air aeroplanes (models 90 and 65-90 series). It requires the installation of a warning label (called a "placard") near the standby compass — the backup magnetic navigation instrument used if the main systems fail.

The specific requirement Install a placard with this exact wording:

"WARNING WHEN USING STANDBY COMPASS SWITCH OFF WINDSHIELD ANTI-ICE AND AIRCONDITIONER"

Why this matters Electrical currents running through the windshield anti-icing and air conditioning systems can interfere with the standby compass, causing it to display incorrect directions. If pilots don't know to switch these systems off when using the backup compass, they could receive false heading information — a serious safety risk during flight.

Who must comply All operators of affected aircraft must install this placard immediately (the term "forthwith" means without delay).

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AD/BEECH 90/10 - Standby Compass Deviation Placard - Installation

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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 90/10 Standby Compass Deviation Placard - Installation

11/67

Applicability: All models.

Requirement: Install a warning placard near the standby compass worded as follows:

“WARNING WHEN USING STANDBY COMPASS SWITCH OFF WINDSHIELD ANTI-ICE AND AIRCONDITIONER”.

Compliance: Forthwith.

Source text

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