1AD/LA-4/10 Amdt 2 - Aircraft Structure - Inspection for Corrosion

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AIRWORTHINESS DIRECTIVE

On the effective date specified below, and for the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/LA-4/10 Amdt 1 and issues the following AD under subregulation 39.1 (1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

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Consolidated Aeronautics, Colonial and LA-4 Series Aeroplanes

AD/LA-4/10

Amdt 2

Aircraft Structure - Inspection for Corrosion 1/2005

Applicability: All models.

Requirement: 1. Inspect the aircraft structure in accordance with Lake Aircraft Service Letter No.25.

2. Inspect all control system push pull rods for corrosion. Where corrosion is suspected under rivet heads, one or more of the following methods may be used to determine if corrosion exists or the joint integrity has been lost:

Attempts should be made to remove the rivet heads by a light sharp blow with an aluminium tool made from bar stock with a blunt tip, or

b. If it is possible to rotate the control tube whilst the end fitting is held still, then rivet integrity is lost and all rivets are to be replaced.

3. When rivets in any control system push pull rod are to be replaced, then the following will apply:

All rivets are to be removed from the control push rod.

b. The control push rod tube and end fitting are to be internally and externally inspected for corrosion or damage and repaired as necessary.

c. Reassemble the control rod in accordance with approved data.

Note: It is recommended that during reassembly of push pull rods, a jointing compound be used to help protect the rivets in the joint from future corrosion.

Compliance: 1. Within 100 hours time in service after 30 April 1974 and thereafter at intervals not exceeding 1 year.

2. Within 100 hours time in service after 5 November 2003 and thereafter at intervals not exceeding 1 year.

3. If any rivets are found damaged or corroded.

This Amendment becomes effective on 20 January 2005.

Consolidated Aeronautics, Colonial and LA-4 Series Aeroplanes