Commonwealth legislation

AD/TB20/26 Amdt 3 - Rudder Balance Weight

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Commonwealth

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legislative instrument

Plain English Summary

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This airworthiness directive requires owners/operators of specific Socata TB20 and TB21 aircraft (listed by serial number) to install or modify the rudder balance weight in accordance with Socata Service Bulletin 10-071-55 Revision 3 to prevent galvanic corrosion between the balance weight and rudder tip stiffeners. Operators bear the cost and must complete the work by the stated deadlines (which vary by serial-number range); the Civil Aviation Safety Authority enforces compliance and may ground or take regulatory action for non‑compliance.

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AD/TB20/26 Amdt 3 - Rudder Balance Weight

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Aerospatiale (Socata) TB20 (Trinidad) Series Aeroplanes

AD/TB20/26

Amdt 3

Rudder Balance Weight 6/98

Applicability: Model TB20 and TB21 aircraft with serial numbers 1 through 1554, 1754 through 1757, and 1767 through 1821.

Requirement: Action in accordance with Socata TB Service Bulletin 10-071-55 Revision 3.

Note: DGAC AD 93-012 (A) R2 refers.

Compliance: For aircraft serial numbers 1 through 1554: Before 31 August 1998.

For aircraft serial numbers 1754 through 1757, and 1767 through 1821:

Before 31 December 1998.

This amendment becomes effective on 21 May 1998.

Background: The DGAC requires certain measures to be taken to avoid development of galvanic corrosion between the balance weight and both rudder tip stiffeners. Amendment 1 reflected a requirement document revision which corrected text anomalies and material information. Amendment 2 reflected a requirement document revision which clarified applicability.

Amendment 3 is issued in response to a revision of the related DGAC AD which reflects a revision of the Requirement document which expands applicability and compliance times.

Amendment 2 to this airworthiness directive became effective on 26 May 1994. Amendment 1 to this airworthiness directive became effective on 22 July 1993.

The original issue of this airworthiness directive became effective on 29 April 1993.

Source text

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

1 AD/TB20/26 Amdt 3 - Rudder Balance Weight