COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Maule M-4 Series Aeroplanes AD/ML-M4/10 Fuel Return Lines - Inspection and Modification 11/75 Applicability: Model M-4-210 with S/Nos. 1001 to 1045. Model M-4-210C with S/Nos. 1001C to 1117C. Requirement: 1. Inspect line P/No. 5182X-21 for leakage and cracking in accordance with Maule SL No. 31. 2. Replace line P/No. 5182X-20 in accordance with Maule SL No. 31 or in accordance with a scheme approved by the Secretary; or 3. FAA AD 75-11-02. Compliance: Within 100 hours time in service after 28 November 1975.