78-21-03 PIPER AIRCRAFT CORPORATION: Amendment 39-3316. Applies to Model PA-34-200T, serial numbers 34-7570001 through 34-7870207, certificated in all categories. \n\n\tCompliance is required within the next ten hours' time in service after the effective date of this A.D. unless already accomplished. \n\n\tTo prevent a fuel leak, accomplish the following: \n\n\t(a)\tOn serial numbers 34-7570001 through 34-7870194, accomplish the following: \n\n\t\t(1)\tRemove the right and left engine nacelle aft hatch assemblies. \n\n\t\t(2)\tIn the right engine aft nacelle compartment, inspect the fuel inlet line to the boost pump at the mixture control cable for evidence of chafing. \n\n\t\t\t(i)\tIf chafing is evident, replace the fuel line with the approved fuel line, Piper Part Number 95153-145. Install protective sleeves, Piper Part Numbers 63882-73 and 63882-83, or equivalent fuel resistant flexible sleeves on the fuel inlet line and the mixture control cable. Secure the sleeves in place with tie raps, Piper Part Number 488-702 or equivalent fuel resistant devices (see Figure No. 1). Leak check the fuel line using normal maintenance procedures. \n\n\t\t\t(ii)\tIf no chafing is evident, remove existing clamps or Koroseal tie (if installed) and install protective sleeves, Piper Part Number 63882-73 and 63882-83, or equivalent fuel resistant flexible sleeves on the fuel inlet line and the mixture control cable. Secure the sleeves in place with tie raps, Piper Part Number 488-702, or equivalent fuel resistant devices (see Figure No. 1). \n\n\n\n\n\t\t(3)\tIn the left engine aft nacelle compartment, inspect the fuel inlet line to the boost pump at the propeller governor control cable for evidence of chafing. \n\n\t\t\t(i)\tIf chafing is evident, replace the fuel line with the approved fuel line, Piper Part Number 95153-144. Secure the fuel line to the control cable as shown in Figure No. 2. Leak check the fuel line using normal maintenance procedures. \n\n\t\t\t(ii)\tIf no chafing is evident, unless already accomplished, secure the fuel line to the control cable as shown in Figure No. 2. \n\n\n\n\t\t(4)\tReplace the right and left engine nacelle aft hatch assemblies and make appropriate maintenance record entry. \n\n\t(b)\tOn serial numbers 34-7870195 through 34-7870207, accomplish the following: \n\n\t\t(1)\tRemove the right engine nacelle aft hatch assembly. \n\n\t\t(2)\tInspect the fuel inlet line to the boost pump at the mixture control cable for evidence of chafing. \n\n\t\t\t(i)\tIf chafing is evident, replace the fuel line with the approved fuel line, Piper Part Number 95153-145. Install protective sleeves, Piper Part Number 63882-73 and 63882-83, or equivalent fuel resistant flexible sleeves on the fuel inlet line and the mixture control cable. Secure the sleeves in place with tie raps, Piper Part Number 488-702 or equivalent fuel resistant devices (see Figure No. 1). Leak check the fuel line using normal maintenance procedures. \n\n\t\t\t(ii)\tIf no chafing is evident, remove existing clamps or Koroseal tie (if installed) and install protective sleeves, Piper Part Number 63882-73 and 63882-83, or equivalent fuel resistant flexible sleeves on the fuel inlet line and the mixture control cable. Secure the sleeves in place with tie raps, Piper Part Number 488-702, or equivalent fuel resistant devices, (see Figure No. 1). \n\n\t\t(3)\tReplace the right nacelle aft hatch assembly and make appropriate maintenance record entry. \n\n\t(c)\tAn alternate method of compliance may be approved by the Chief, Engineering and Manufacturing Branch, Federal Aviation Administration, Southern Region. \n\n\t(Piper Service Bulletin 596A, dated September 11, 1978, pertains to this same subject.) \n\n\tThis supersedes Amendment 39-3222, 43 FR 22341, AD 78-11-04. \n\n\tThis amendment becomes effective October 26, 1978.