COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Propellers - Variable Pitch - Hartzell
AD/PHZL/62
Amdt 4
Propeller Blade Pilot Tube Bore 7/94 DM
Applicability: All Hartzell HC-B5MP-3A/M10282A(B)+6 propellers installed on Nord 262 (Frakes conversion) aircraft fitted with P&W PT6A-45 series engines and all Hartzell HC- B5MP-3A/M10282A(B)+6 propellers installed or being installed on Shorts SD3-30 aircraft that have previously operated on a Nord 262 (Frakes Conversion) aircraft.
Note: Propellers fitted with the ‘N’ suffix blades are exempted from the requirements of this directive. eg. M10282AN(B)+6.
Requirement: 1. For propellers fitted with M10282A(B)+6 blades action in accordance with Hartzell Service Bulletin No 178.
2. Replace M10282A(B)+6 blades with M10282AN(B)+6 blades.
Compliance: 1. For propellers with less than 200 flight cycles from last blade bore inspection; prior to completing 300 flight cycles.
For propellers in service with more than 300 flight cycles since last inspection; prior to completing 350 cycles.
For propellers that have operated more than 350 flight cycles since last inspection; prior to further flight after 15 May 1994. Thereafter, reinspect all blade bores at intervals not exceeding 300 flight cycles until M10282A(B)+6 blades have been replaced with M10282AN(B)+6 blades.
2. By 30 June 1994.
Background: Due to a recent in-flight failure of a M10282A(B)+6 propeller blade the 3 year inspection interval of the blade bore has been cancelled. Amendment 3 raised after the CAA investigation showed that crack propagation was such that a reduction in inspection is necessary to detect a crack before eventual failure. This further amendment is being raised in sequence after the manufacturer advised that in the best interest of safety the subject blades should be retired from service if previously operated on Nord 262 aircraft.