COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Dornier DO-27 Series Aeroplanes AD/DO-27/6 Fuel and Oil Hose Assemblies - Inspection NK Applicability: All Dornier DO-27 series aeroplanes equipped with German Standard LN9226 fuel and oil system hoses that: (a) have Technochemie end fittings, (b) were installed or supplied as spares by the Dornier factory between 1 December 1964 and 1 September 1965; and (c) have not subsequently been returned to Dornier for checking. Requirement: Inspect affected fuel and oil system hose assemblies for internal damage and obstruction of the bore as specified in Dornier TB No. 27-29 Second Edition. German AD No. 65-85 also refers to this subject. Note: Dornier TB No. 28-26A provides information on the means of identification of Technochemie end fittings. Compliance: Installed hoses: Unless already accomplished subsequent to 1 September 1965, within the next 100 hours time in service after 2 November 1967. Spare hoses: Before installation and repeat once within the first 100 hours time in service.