Commonwealth legislation

AD/IAI-A/2 - Aileron Autopilot Servo

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legislative instrument

Plain English Summary

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Requires operators of specified Israel Aircraft Industries 1125 / Astra SPX aeroplanes (serial nos. 030 and 042–086) to inspect the SVO‑85C autopilot aileron‑servo attachment arm, repair or replace any damaged parts, and install a stopper angle per Astra Alert Service Bulletin No 1125‑27A‑157. CASA sets 50‑hour and before‑further‑flight deadlines; operators pay for inspections, repairs and parts. The directive aims to prevent rolling oscillations caused by excess servo travel from a shorter attachment arm.

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AD/IAI-A/2 - Aileron Autopilot Servo

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Israel Aircraft Industries 1125 (Astra) Series Aeroplanes

AD/IAI-A/2 Aileron Autopilot Servo 1/2000 DM

Applicability: Models 1125 and Astra SPX aeroplanes with serial numbers 030 and 042 to 086 inclusive.

Requirement: 1. Check the attachment arm position of the SVO-85C autopilot aileron servo actuator.

2. If the position of the arm is found to be incorrect during the Requirement 1 check, inspect the arm, control link and bellcrank for damage and, if necessary, repair or replace the damaged parts.

3. Install a stopper angle.

Note 1: All actions are to be completed in accordance with Astra Alert Service Bulletin No 1125-27A-157.

Note 2: Israel CAA AD 27-99-10-06 refers.

Compliance: 1. Within 50 hours time in service from 8 December 1999.

2. Before further flight following the Requirement 1 inspection.

3. Within 50 hours time in service from 8 December 1999.

This Airworthiness Directive becomes effective on 8 December 1999.

Background: The Israel CAA has advised of an unsafe condition involving possible rolling oscillations during autopilot operation. A shorter attachment arm on a new type of autopilot aileron servo actuator allows operation beyond former travel limits, this in turn can drive a control link out of position causing actuation in the opposite direction of autopilot command.

Source text

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

1 AD/IAI-A/2 - Aileron Autopilot Servo