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kiln dried to the requirements of subsection 5.

5 Moisture content

       The moisture content of each plank must be determined by means of an electrical resistance type moisture meter or other approved method. Tests must be made at points approximately 300 mm from each end and at the mid length. The 3 readings must lie between 10% and 15% and the individual readings must not vary more than 2% moisture content in any 1 plank. The average moisture content must not vary more than 3% between planks.

Note   An acceptable alternative method of determining moisture content is given in Appendix II.

6 Density

       With a moisture content within the limits specified in subsection 5, the measured density of each plank must not be less than the value given in Appendix I for the particular timber.

Note   An acceptable method for determining density is given in Appendix II.

7 Brittleness

       In order to detect brittleness, 2 samples from each plank must be tested for impact resistance in an Izod testing machine. The Izod values obtained for the standard specimen shown in Figure I of Appendix II must not be less than 6.5 joules.

Note   Details of the Izod test method are given in Appendix II. This test may be carried out by the propeller manufacturer subject to approval by the Director.

8 Marking

       Each plank accepted as complying with this specification must be ink stamped with the following particulars:

(a) the standard name of the timber (i.e. Maple, Queensland, Coachwood,
Mahogany, Honduras etc);

(b) the number — CAO 108.29.
Appendix I

Timbers approved for use in aircraft propellers

Timbers                                   Minimum density
                                          Kilograms/cubic metre
1 Ash, Mountain/Ash Alpine                601
 (Eucalyptus regnans/
 (Eucalyptus delegatensis)
2 Ash, Silver, Northern                   633
 (Flindersia pubescens)
3 Ash, Silver Queensland                  577
 (Flindersia bourjotiana)
4 Beech, Myrtle                           671
 (Nothofagus cunninghamii)
5 Birch, White                            604
 (Schizomeria ovata)
6 Bollywood                               449
 (Litsea reticulata)
7 Coachwood                               577
 (Ceratopetalum apetalum)
8 Mahogany Honduras                       513
 (Swietenia macrophylia)
    9 Maple, Queensland                   513
    (Flindersia brayleyana/pimenteliana)
10 Oak, Silky Southern                    615
 (Grevillea robusta)
11 Pine, Bunya                            420
 (Araucaria bidwillii)
12 Pine, Hoop                             455
 (Araucaria cunninghamii)
13 Pine, Klinki                           385
 (Araucaria hunsteinii)
14 Sassafras                              543
 (Doryphora sassafras)
15 Spruce, Sitka                          384
 (Picea sitchensis)

Appendix II

A — Alternative method for the determination of slope of grain

      The direction of splitting is probably the best guide to the slope of the grain. Splinters prised out from the surface of a piece of wood with a pocket knife will also reveal the grain direction and a drop of ink placed on a face of the piece of wood will spread most readily in the direction of the grain. A swivel handled scribe may also be used to determine the slope