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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

 

Image unavailable in extracted text Percival Proctor Series Aeroplanes

 

AD/PROCTOR/11

(Re-Issue)

Applicability: All models.

Airframe Structure - Inspection 1/73

 

Requirement: 1. Preparation: Prepare the aeroplane for inspection by removing all removable equipment, cabin linings, seats, inspection 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:

 

1. Inspect all fabricated structural components such as box spars, wooden ribs, bulkheads and braces, and all glued connections between these components for the following defects:-

 

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

 

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

 

b.    Inspect all plywood skin for the following defects:-

 

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

 

(2)     Separation of the glue where skin connects to the skiletal structure beneath. Particular attention should be paid to the flaps since they are exposed to moisture, and also subject to contamination by oil.

 

Note: Load carrying wooden skin becomes inefficient and the complete structure loses strength when adhesion to the structure beneath has failed. Consequently, all structural connections and joints must be thoroughly inspected for deterioration and defects. When carrying out an inspection the following may prove helpful in detecting defects.

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES