COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Ayres Thrush (Snow) Commander Series Aeroplanes AD/AC-SNOW/21 Vertical Tail Attachment Bracket 1/94 Applicability: Models Serial Numbers S2R 5000 through 5099, 1380R, and 1416R through 2583R S2R-R1340 R1340-001 through R1340-030 (with or without DC suffix) S2R-R3S R3S-001 through R3S-011 (with or without DC suffix) S2R-R1820 R1820-001 through R1820-035 (with or without DC suffix) S2R-T11 T11-001 through T11-005 (with or without DC suffix) S2R-T15 T15-001 through T15-029 (with or without DC suffix) and T27- 001 through T27-029,, and T27-031 (with or without DC suffix) S2R-T34 6000 through 6049, T34-001 through T34-180, T34-190, T34- 191, and T34-192 (with or without DC suffix) T36-001 through T36-180 (with or without DC suffix); and T41-001 through T41- 180 (with or without DC suffix) S2R-T45 T45-001 through T45-003 (with or without DC suffix) S2R-T65 T65-001 (with or without DC suffix) S2R-HG-T65 T65-002 through T65-010 (with or without DC suffix) S2RG6 G6-101 through G6-112 S2R-G10 G10-101 Requirement: 1. Inspect the bracket that attaches the vertical tail front spar to the horizontal stabiliser for damage (cracks, broken lugs or bolts, or elongated holes) in accordance with the Accomplishment Instructions: I. Inspection, section of Ayres Service Bulletin SB-AG-32. If any damage is found to the bracket during the inspection specified above, replace the bracket with an aluminium bracket, part number 40301T007, and install a new close out plate, part number 40309T003, in accordance with the Accomplishment Instructions: II. Repair, section of Ayres Service Bulletin SB-AG-32. 2. Replace the bracket with an aluminium bracket, part number 40301T007, and install a new close out plate, part number 40309T003, in accordance with Accomplishment Instructions: II. Repair, section of Ayres Service Bulletin SB-AG-32. COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES The replacement may be accomplished instead of the inspection specified in Requirement 1 of this Directive provided it is accomplished at or prior to the 50 hours' time in service compliance time. Note: FAA AD 93-20-05 Amdt 39-8713 refers. Compliance: 1. Within 50 hours' time in service after 6 January 1994. 2. Unless already accomplished, within 100 hours' time in service after 6 January 1994. Background: There have been reports of broken lugs or bolts on the vertical tail attachment bracket on a significant number of aircraft.