AD/PFP/3 Amdt 3 - Fairey Metal Propellers (Cth)

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES

Propellers - Fixed Pitch

AD/PFP/3 Amdt 3

Fairey Metal Propellers 10/88

Applicability: All Fairey Metal propellers. Requirement: 1. Daily Inspection: Carefully examine the blade sheet for cracks on both sides and both edges in the region adjacent to the boss and identification stamping. This inspection may be made visually and without removing the propeller from the aircraft. Withdraw from service any propeller found to be cracked.

Note: Daily inspection may be performed and certified by the pilot or owner.

2. Half Overhaul Period Inspection:

Remove the propeller from the hub and the boss blocks from the blade sheet. Clean the blade sheet and inspect for cracks, particularly in the vicinity of the bolt holes and in regions where any fretting or corrosion has occurred. This inspection shall be made under strong diffused illumination using a suitable microscope with magnification in the range 15 to 25 diameters. Withdraw from service any propeller found to be cracked.

If no cracks are found, remove any fretting or corrosion from the blade sheet and boss blocks by means of coarse emery followed by fine emery.

Before re-assembly, ensure that the boss blocks are correctly fitted to the blade sheet using the blueing method. At least 80 per cent contact shall be achieved and at no place shall there be more than .002-in. clearance between boss blocks and blade sheet. This mating of surfaces shall be obtained without bolt pressure of any kind. A light tap with a mallet on the faces of the boss, which is held in alignment on the blade sheet by a suitable mandrel, is all that is permitted to obtain a blade marking.