Civil Aviation Order 108.28 Instrument 2007 (Cth)

I, WILLIAM BRUCE BYRON, Director of Aviation Safety, on behalf of CASA, make this instrument under regulation 21A of the Civil Aviation Regulations 1988.

[Signed Bruce Byron] Bruce Byron Director of Aviation Safety and Chief Executive Officer

19 December 2007

Civil Aviation Order 108.28 Instrument 2007

1 Name of instrument

This instrument is the Civil Aviation Order 108.28 Instrument 2007.

2 Commencement

This instrument commences on the day after it is registered.

3 New Civil Aviation Order 108.28

Civil Aviation Order 108.28 is repealed and a new Civil Aviation Order 108.28 substituted as set out in Schedule 1.

Schedule 1 Civil Aviation Order 108.28

Specification — manufacture of fixed pitch wooden propellers

1 Application

This Civil Aviation Order specifies standards and practices for the manufacture of fixed pitch wooden propellers and applies in such circumstances as may be directed by the Director or an authorised person under the Civil Aviation Regulations 1988.

2 Approved timbers

2.1Wooden propellers must be manufactured only from types of timber approved and selected in accordance with Civil Aviation Order 108.29.

2.2Timber for use in wooden propellers must be quarter sawn, unless otherwise approved.

3 Laminae

3.1Each lamina must be cut from the planks so that the direction of its grain is as nearly as possible parallel to its length. The inclination of the grain on the edges of the short laminae used at the front and back faces of a propeller must not exceed 1 in 12 on the edges relative to the glued faces, and on the faces relative to the longitudinal axis of each lamina.

3.2After being cut to shape and reduced to the required thickness, the laminae must be kept in the gluing room or under similar atmospheric conditions for a period of at least 24 hours before being glued. Any laminae found to be warped at the expiration of this period must be rejected.