Document ID: chunk:federal_register_of_legislation:F2006B02276:body:0
Version: federal_register_of_legislation:F2006B02276
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COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY
 SCHEDULE OF AIRWORTHINESS DIRECTIVES

 Allison Turbine Engines - 250 Series

 AD/AL 250/65 Engine Power and Accessory Gearbox - New
                        Magnetic Plug Introduction

 4/85

            Applicability:  Model 250-C30 and C30S engines (and power and accessory gearboxes) installed in or intended for installation in S-76 Helicopters and which incorporate magnetic plug P/N 23001915.

 Requirement: Fit new magnetic plugs P/N 6871534 in lieu of old plugs P/N 23001915.

            Allison 250-C30, C30S CEB-A-72-3098 Revision 1.

 Compliance: 1. For installed Engine/gearbox assemblies:

              Unless already accomplished, prior to issue of the next Maintenance Release after 30 April 1985.

              2. For uninstalled engines, power and accessory gearboxes, housings and covers: Prior to installation in an aircraft.
            Background: In service experience with automatic fuzz burn off magnetic plugs P/N 23001915 has indicated that early detection of oil system contamination is being lost due to the effectiveness of the fuzz burn off feature.

            CEB-A-72-3098 replaces the auto fuzz burn off plug with the 6871534 plug which is currently fitted to the 250-C20 engine and has proven to be reliable in providing an early indication of engine or gearbox oil contamination.