AD 75-11-02

75-11-02 MAULE AIRCRAFT CORPORATION: Amendment 39-2199. Applies to the Models M-4-210 serial numbers 1001 through 1045; M-4-210C serial numbers 1001C through 1117C; M-5-210C serial numbers 6001C through 6069C, 6072C, 6076C, 6077C, 6079C, 6080C, 6084C, and 6087C, certificated in all categories. Compliance required within the next 30 hours' time in service after the effective date of this AD unless already accomplished. To prevent fuel leakage in the cabin area and allow fuel line flexibility, accomplish the following or an equivalent modification approved by the Chief, Engineering and Manufacturing Branch, FAA, Southern Region: 1. Turn the fuel tank selector valve to off position. 2. Remove the engine fuel injector return line from the firewall to the fuel header tank. (Line located in cabin wall to left of pilots feet.) 3. Short line inspection - Inspect the short line connected at the firewall to the check valve for cracking around the flares. If cracks are found,replace line with a serviceable line in accordance with Advisory Circular 43.13. 4. Long line replacement - Remove existing long line and install an 8-inch long, 1/4 inch diameter aluminum tube, between the return check valve and the header tank, using appropriate tube and fittings. This line is to incorporate a 1.5 to 2.0 inch diameter loop in the middle. Use caution when bending the tubing to prevent kinking. This looped tubing must be installed with the plane of the loop horizontal so that no low undrainable spots exist. 5. The check valve must be reinstalled with the arrow pointing aft. 6. Functional check the return line for leaks and repair as necessary. Maule Aircraft Corporation Service Letter 31 covers the same subject. This amendment becomes effective May 19, 1975.