COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Piper PA-34 (Seneca) Series Aeroplanes AD/PA-34/25 Vertical Fin and Stabilator Attachments - Inspection 1/78 Applicability: All model PA34-200 with S/Nos. 34-E4, 34-7250001 to 34-7450220. All model PA- 34-200T with S/Nos. 34-7570001 to 34-7770441. Document: Piper SB No. 579. Compliance: Part 1 - Within 25 hours time in service after 16 January 1978. Part II - Within 100 hours time in service after 16 January 1978.