AIRWORTHINESS DIRECTIVE On the effective date specified below, and for the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/PHZL/68 Amdt 3 and issues the following AD under subregulation 39.001(1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section. Propellers - Variable Pitch - Hartzell AD/PHZL/68 Amdt 4 Turbine Engine; Steel Hub Propellers 7/2006 DM Applicability: All Hartzell model HC-A3VF-7( ), HC-B3TF-7( ), HC-B3MN-3( ), HC-B3TN-2 ( ), HC-B3TN-3( ), HC-B3TN-5( ), HC-B4MN-5( ), HC-B4MP-3( ), HC-B4TN-3( ), HC-B4TN-5( ), HC-B5MA-3( ), HC-B5MP-3( ), HC-B5MP-5( ), HC-B3MN-5( ), HC-B3TN-4( ), HC-B4MP-4( ) and HC-B5MN-3( ) propellers with hub serial numbers (S/N) as listed in Table 1 of this Directive. Requirement: 1. Replace affected propeller hubs as listed by serial number (S/N) in Table 1 with hubs not listed by S/N in Table 1. The two-letter prefix of some existing propeller hub serial numbers may be followed by a third letter 'A.' The presence or absence of this letter has no significance in determining compliance. Since a hub may be used in various propeller models, the S/N and the model number shown in Table 1 of this AD may not coincide. Precedence is given to the hub S/N in determining compliance requirements. The hub model is only given as a reference. 2. Perform a fluorescent penetrant inspection of blades for cracks as per Hartzell Aluminium Blade Manual 133C. 3. Carry out Magnetic Particle Inspection of the Blade clamps as per Hartzell Service Manual 202A. Note 1: FAA AD 96-18-14 Amdt 39-9738 refers. Compliance: 1. As listed for the applicable S/N hubs as listed in Table 1 of this Directive. Hub replacement must be accomplished by the end of the calendar month indicated at the top of the appropriate column in Table 1 of this AD. The S/N ranges in this table identify the propeller hubs that require replacement by the end of that month. 2. At Propeller disassembly for hub replacement. 3. At Propeller disassembly for hub replacement. This Amendment becomes effective on 3 May 2006. Background: This Directive was originally issued to address several hub, blade, and shank failures reported overseas on Mitsubishi MU-2 aircraft. In one incident, an aircraft was involved in a fatal accident. Due to the similarity of construction and load transfer paths between the 3, 4 and 5 bladed propeller models and propellers installed on the MU-2 aircraft, the FAA has mandated replacement of certain Hartzell turbine propeller hubs over a 10 year time period. Amendment 1 altered Table 1 and removed reference to AD/PHZL/43 Amdt 6. Table 1 was updated to reflect removal of certain serial number hubs from the Table of applicability. References previously made to AD/PHZL/43 Amdt 6 are now directed to the Hartzell Blade Manual 133C. Amendment 2 clarified Requirement 2 of the Directive and reflected the requirements of the referenced FAA Directive. Amendment 3 clarified the requirements relating to identification of the hub serial number and the existence in some cases of a suffix to the 2 letter prefix. This amendment is issued to correct the omission of a section of Table 1. The original issue of this Airworthiness Directive became effective on 2 January 1997. Amendment 1 of this AD became effective on 11 July 2002. Amendment 2 of this AD became effective on 20 January 2005. Amendment 3 of this AD became effective on 13 April 2006. TABLE 1. Replacement due by end: MAR 97 SEP 97 MAR 98 SEP 98 MAR 99 SEP 99 Hub Model No. Serial No. Series HC-B3TN-3 BU 1-377 378-754 755-1881 1882-3008 3009-3840 3841-4673 HC-B3MN-3 GB HC-B3MN-5 FZ HC-B3TN-5 BV 1-86 87-172 173-529 530-885 886-1622 1623-2359 HC-B3TN-4 FK HC-B3TN-2 AG 1-59 60-118 119-174 175-231 232-238 HC-B3TF-7 EX 1-3 4-7 HC-A3VF-7 DS 1 2-20 21-39 HC-B4TN-5 CD 1-94 95-187 188-663 664-1139 1140-1399 1400-1660 HC-B4TN-3 EA 1-169 170-338 339-437 438-537 538-758 759-979 HC-B4MN-5 FL 1-35 36-70 71-238 239-406 HC-B4MP-3 FW 1-15 16-31 HC-B4MP-4 FU 1-3 4-7 Replacement due by end: MAR 97 SEP 97 MAR 98 SEP 98 MAR 99 SEP 99 Hub Model No. Serial No. Series HC-B5MP-5 EZ 1 HC-B5MA-3 HB HC-B5MN-3 ES 1 HC-B5MP-3 EV 1-51 52-101 102-223 224-345 346-478 479-612 HC-B5MP-3 FT 1-3 4-6 Replacement due by end: MAR 2000 SEP 2000 MAR 2001 SEP 2001 MAR 2002 SEP 2002 Hub Model No. Serial No. Series HC-B3TN-3 BU 4674-5707 5708-6742 6743-7864 7865-8987 8988-10409 10410-11832 HC-B3MN-3 GB HC-B3MN-5 FZ HC-B3TN-5 BV 2360-2689 2690-3020 3021-3410 3411-3600 3601-4035 4036-4270 HC-B3TN-4 FK 1 2-3 HC-B3TN-2 AG 239-244 245-295 296-351 HC-B3TF-7 EX 8-47 48-87 88-112 113-136 137-138 139-140 HC-A3VF-7 DS 40-109 110-179 180-230 231-280 281-313 314-345 HC-B4TN-5 CD 1661-1848 1849-2036 2037-2133 2134-2230 2231-3134 3135-3342 HC-B4TN-3 EA 980-1003 1004-1028 1029-1036 1037-1043 1044-1092 1093-1142 HC-B4MN-5 FL 407-411 412-416 417-423 424-429 430-436 437-1002 HC-B4MP-3 FW 32-371 372-711 712-1024 1025-1338 1339-1393 1394-2034 HC-B4MP-4 FU 8 Replacement due by end: MAR 2000 SEP 2000 MAR 2001 SEP 2001 MAR 2002 SEP 2002 Hub Model No. Serial No. Series HC-B5MP-5 EZ 2 3-4 HC-B5MA-3 HB 1 2-3 4-28 29-52 53-78 79-1018 HC-B5MN-3 ES 2-7 8-13 HC-B5MP-3 EV 613-720 721-826 827-894 895-961 962-1002 1003-2030 HC-B5MP-3 FT 7 8 Replacement due by end: MAR 2003 SEP 2003 MAR 2004 SEP 2004 MAR 2005 SEP 2005 Hub Model No. Serial No. Series HC-B3TN-3 BU 11833-13487 13488-15141 15142-16299 16300-17457 17458-18308 18309-19160 HC-B3MN-3 GB 1-162 163-324 325-361 362-438 HC-B3MN-5 FZ 1-23 24-45 46 HC-B3TN-5 BV 4271-4523 4524-4776 4777-4809 4810-4843 4844-4945 4946-6022 HC-B3TN-4 FK 4 HC-B3TN-2 AG 352-447 448-543 544-682 683-821 822-886 887-950 HC-B3TF-7 EX 141-208 209-275 276-330 331-386 387-472 473-558 HC-A3VF-7 DS 346-396 397-446 447-454 455-482 483-496 497-511 HC-B4TN-5 CD HC-B4TN-3 EA HC-B4MN-5 FL HC-B4MP-3 FW HC-B4MP-4 FU Replacement due by end: MAR 2003 SEP 2003 MAR 2004 SEP 2004 MAR 2005 SEP 2005 Hub Model No. Serial No. Series HC-B5MP-5 EZ HC-B5MA-3 HB HC-B5MN-3 ES HC-B5MP-3 EV HC-B5MP-3 FT James Coyne Delegate of the Civil Aviation Safety Authority 1 May 2006