COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Auster/Beagle A.61 Series Aeroplanes
AD/AUS/8 Lift Strut 10/50
Applicability: All models.
Requirement: Inspect all lift struts not sealed at manufacture for signs of internal corrosion and treat corroded struts as follows:
- Rear Lift Struts:
(a) Remove the screwed adjustment plug from the upper end of the lift strut and pour in a reasonable quantity of dry, sharp sand.
(b) Shake the strut to cause the sand to remove any loose particles of rust by abrasion. Do this carefully to ensure that all parts of the strut are clean.
(c) Drain out the sand and rust and, if possible, drive out all the loose matter by means of an air blast.
Note: The sand should not be used more than once.
(d) Pour in an adequate quantity of linseed oil or an approved rust preventive, e.g. DTD279, and rotate the strut to ensure that the whole of the inside surface is fully covered. Drain and seal the bottom end of the screwed plug sleeve with a fibre hardwood plug, followed by a coat of varnish.
2. Front Lift Struts:
(a) Drill out the hole for the top attachment bolt 1/16 inch oversize.
(b) Pour in dry, sharp sand and carry out the cleaning and treating processes as described in paragraphs 1(b) to 1(d) of this Directive.
(c) To seal the strut insert a piece of tube (equivalent to B.S. Spec. T45) of such a diameter as to fill the 1/16 inch diameter oversize hole and silver solder in position. The tube wall thickness should be sufficient to ensure that the bush can be drilled and reamed to the diameter 5/16 inch +.002 -.000 after soldering is completed.
3. If struts appear to be in an advanced state of corrosion replace immediately or refer to the Department before further use.
Compliance: Forthwith.