Commonwealth legislation

AD/LA-4/24 - Automatic Flight Control System

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Jurisdiction

Commonwealth

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legislative instrument

Plain English Summary

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What it does: This Airworthiness Directive requires owners/operators of Lake Model 250 aeroplanes fitted with a Bendix/King KFC 150 automatic flight control system to disable the autopilot and trim (pull the 'A/P' and 'TRIM' circuit breakers and secure them) and to install a visible placard reading "USE MANUAL TRIM ONLY."

Why it matters: The measure responds to an FAA report that the autotrim failed to return to neutral and caused a flight-path deviation; compliance is required within ten hours to prevent similar incidents (Applicability; Requirement 1–2; Compliance; Background).

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Direct links to the current provisions in AD/LA-4/24 - Automatic Flight Control System.

AD/LA-4/24 - Automatic Flight Control System

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Consolidated Aeronautics, Colonial and LA-4 Series Aeroplanes

AD/LA-4/24 Automatic Flight Control System 1/95 DM

Applicability: All Lake Model 250 aircraft that are equipped with a Bendix/King KFC 150 Automatic Flight Control System.

Requirement: 1. Deactivate the automatic flight control by pulling the circuit breakers marked 'A/P' and 'TRIM' and attach a collar or tie-wrap to the circuit breakers to prevent their resetting.

Fabricate a placard with the words `USE MANUAL TRIM ONLY’ and install this placard on the instrument panel within the pilot’s clear view.

Note: FAA AD 94-22-02 Amdt 39-9051 refers.

Compliance: Within ten hours time in service from 9 November 1994.

Background: The FAA has received a report where the Bendix/King KFC 150 system malfunctioned because the elevator trim spring lever failed to return to neutral following automatic flight control system autotrim operation resulting in the aircraft deviating from its flight path. Compliance with this Directive is designed to prevent flight path deviations caused by failure of the elevator autotrim to disengage.

Source text

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

1 AD/LA-4/24 - Automatic Flight Control System