AD/GENERAL/29 - Wooden Aircraft - Airframe Structural Inspection (Cth)

Federal Register of Legislation

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

Aircraft - General

AD/GENERAL/29 Wooden Aircraft - Airframe NK

Structural Inspection

Applicability: All aeroplanes and rotorcraft having wooden stressed shell structures or wooden box spars, except Proctor and Vega Gull series.

Note: This does not apply to wings with routed laminated or solid spars and fabric coverings.

Requirement: 1. Preparation: Prepare the aeroplane for inspection by removing all removable equipment, cabin linings, seats, inspection and access panels, fairings, fabric patches, tape sealing and sufficient fabric and secondary structure to enable an inspection of the airframe in accordance with these requirements.

2. Inspection Procedure:

2.1 Inspect all fabricated structural components such as box spars, wooden ribs, stringer struts and braces, and all glued connections between these components for the following defects:

(a) Cracks, cuts, splits, bruises, compression shakes, warping, contamination by foreign matter, attack by fungus in the wood, shrinkage of the timber at bolt holes.

(b) Separation or sponginess in the glued joints and plywood. A O.10 mm or 0.005 in. feeler gauge should be used to determine separation of glued joints and the depth of glue failure.

2.2 Inspect all plywood skin for the following defects:

(a) Cracks, splits, cuts, bruises and shakes in the surface of the wood, deterioration and contamination by foreign matter.

(b) Separation of the glue where skin connects to the skeletal structure beneath.

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Document text

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

Aircraft - General

AD/GENERAL/29 Wooden Aircraft - Airframe NK

Structural Inspection

Applicability: All aeroplanes and rotorcraft having wooden stressed shell structures or wooden box spars, except Proctor and Vega Gull series.

Note: This does not apply to wings with routed laminated or solid spars and fabric coverings.

2. Inspection Procedure:

2.1 Inspect all fabricated structural components such as box spars, wooden ribs, stringer struts and braces, and all glued connections between these components for the following defects:

(a) Cracks, cuts, splits, bruises, compression shakes, warping, contamination by foreign matter, attack by fungus in the wood, shrinkage of the timber at bolt holes.

(b) Separation or sponginess in the glued joints and plywood. A O.10 mm or 0.005 in. feeler gauge should be used to determine separation of glued joints and the depth of glue failure.

2.2 Inspect all plywood skin for the following defects:

(a) Cracks, splits, cuts, bruises and shakes in the surface of the wood, deterioration and contamination by foreign matter.

(b) Separation of the glue where skin connects to the skeletal structure beneath.

Read full text →