Document ID: chunk:federal_register_of_legislation:F2007L04873:body:0:p2
Version: federal_register_of_legislation:F2007L04873
Segment Type: other
Provision Reference: 
Character Range: 2580–5505

strictly in accordance with the appropriate manufacturer's instruction.

Note 1   Resorcinol formaldehyde or epoxy adhesives prepared specifically for timber are acceptable.

Note 2   Acid catalysed phenolics and/or urea formaldehyde type adhesives are not acceptable for this purpose.

       4.2The base on which the laminae are to be glued together must be flat and rigid and must provide continuous support for the entire length of the board.

       4.3Clamping of the laminae must be started at the centre of the block, after which other clamps must be fixed alternately on either side until the ends of the block are reached. The distance between adjacent clamps must not exceed 300 mm.

       4.4After the clamps have been removed, the block must be left for at least 48 hours before further operations are commenced. If removed from the gluing stool, the block must be stored in a horizontal position lying on 1 of the boss faces.

5 Boring and drilling

       5.1The bore and bolt holes must be straight, circular, smooth and parallel to the axis of rotation. The bolt holes must be jig drilled.

       5.2The boss faces must be flat, smooth and perpendicular to the axis of the bore.

       5.3To prevent exposure of the end grain, a suitable protective covering must be applied immediately upon completion of the drilling operations.

       5.4Unless otherwise stated on the approved drawing, the manufacturing limits and clearances must be as specified below:

Dimension                            Tolerance
Bore                                 - 0.0 to + 0.5 mm
Diameter of bolt holes               + 2.0 to + 2.5 mm on nominal bolt diameter
Position of bolt holes               within 0.5 mm of specified dimensions
Distances between the boss faces     ± 2.0 mm
Diameter of counter boring (if any)  - 0.0 to + 2.0 mm
Diameter of boss                     - 3.0 to + 4.0 mm

6 Shaping

       6.1After being roughly shaped, the propeller must be stored for at least 10 days under atmospheric conditions similar to the conditions existing in the final shaping shop, i.e. at a temperature of not less than 15C and free from draughts.

       6.2To prevent exposure of the end grain, a suitable protective covering must be immediately applied to the end grain exposed by shaping operation in the area where the blade roots blend into the boss.

       6.3The propeller must be carefully examined during the shaping process for faults or defects.

7 Inspection

       7.1On completion of the final shaping, the propeller must be inspected for accuracy of angles, dimensions, track and balance, and for general finish.

       7.2Unless otherwise stated on the approved drawing, the allowable tolerances on angles, chords, maximum thickness, diameter and track must be as follows:
Angles      1 throughout the inner third of the blade length.

            ½ throughout the outer two-thirds of the blade