COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Propellers - Variable Pitch - Dowty Rotol AD/PR/26 Amdt 1 Front Wall/Snout Radius Cracking 5/90 Applicability: All R212/4-30-4/22, R212/4-30-4/22/1 and R251/4-30-4/49 propellers. Requirement: Inspect the hub front wall/snout radius area for evidence of cracking in accordance with Dowty Rotol SB 61-1053 Revision 2. Note: Hubs previously exempt or certified as having complied with AD/PR/20 must be reinspected in accordance with this Directive. Compliance: In accordance with the Requirement Document. Background: Cracks have been found in the front wall/snout radius area in a limited number of hubs modified to VP 2388 standard. The manufacturer now requires all hubs, modified or unmodified, to be inspected and if a hub is found cracked during overhaul a fleet wide recurring inspection is required. This Amendment incorporates Revision 2 of the Requirement document.