AD/PHZL/54 - Hard Alloy Propeller Blades (Cth)

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

Propellers - Variable Pitch - Hartzell

AD/PHZL/54 Hard Alloy Propeller Blades 1/87 DM

Applicability: All turboprop aircraft fitted with Hartzell propeller blades made from hard alloy.

Note: Hard alloy blades are identified by the letter"H" immediately following the blade design number eg. T10282 HB.

Requirement: 1. All turboprop hard alloy propeller blades which are not painted with Polane paint, or have had de-ice boots replaced since manufacture where it cannot be positively determined that the boots have been fitted onto an approved paint surface, are to be removed from service and reworked in accordance with Section V of Hartzell Blade Specification Manual 133-( ) and Hartzell SB No 138.

Note: All blades are to be anodised before painting (SB 138 Para D refers).

2. (a) Visually inspect the propeller blades in the area from the blade clamp to six inches outboard of the deice boot for scratches, dents, nicks or other signs of exposed bare metal where surface corrosion could initiate. Also inspect the paint coating for signs of deterioration, for example, cracks, chips, bubbles, flaking, blisters, etc., which might indicate the presence of corrosion underneath the paint.

2. (b) Visually inspect the blade deice boot for looseness, bubbles or detachment of the boot. Visually inspect the deice boot adhesive for adequate coverage with protective paint coating, and sealant protection. No bare metal may be exposed.

2. (c) Propellers with blade surface irregularities as described in A and B above are to be removed from service before further flight and treated in accordance with Para C of Hartzell S.B. 138.