COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Piper PA-28 Series Aeroplanes AD/PA-28/78 Fuel Tank Vent and Vent Hose - Modification and Replacement Applicability: Model PA-28-161 with S/Nos. 28-7816024 to 28-7916475. Model PA-28-181 with S/Nos. 28-7890023 to 28-7990493. Model PA-28-201T with S/Nos. 28-7921001 to 28-7921068. Model PA-28-201 with S/Nos. 28R-7737135 to 28R-7837317. Model PA28RT-201 with S/Nos. 28R-7918001 to 28R-7918172. Model PA28R-201T with S/Nos. 28R-7703309 to 28R-7803373. Model PA28RT-201T with S/Nos. 28R-7931001 to 28R-7931222. Model PA-28-235 with S/Nos. 28-7710079 to 28-7710089. Model PA-28-236 with S/Nos. 28-7911001 to 28-7911204. Document: Piper SB No. 646. Compliance: Within 100 hours time in service after 30 November 1979. 11/79 Background: The fuel vent hose material fitted to these aircraft has proved unsuitable in service and may result in leakage of fuel and accumulation of fumes in the wing areas.