COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Parachute Equipment AD/PARA/2 GQ Types 350, 850 and 4.8m SAC Parachutes 13/89 Applicability: Part numbers MRI GQ 1277, MRI GQ 1304, MRI GQ 1325, MRI GQ 1284, MRI GQ 1315, MRI GQ 1330, MRI GQ 1308 and MRI GQ D 22918/2. Requirement: Remove or obliterate TSO-C23b marking from the parachute canopy and remove the canopy from service. Note: FAA AD 89-13-03 refers. Compliance: Forthwith. Background: Further parachute canopy mesh panels have been discovered to be acidic and thereby affecting the strength of adjacent panels.