79-13-03 PIPER AIRCRAFT CORPORATION: Amendment 39-3485. Applies to the following Piper models of aircraft certificated in all categories: PA-28-161, S/N 28-7816340 through 28-7916410; PA-28-181, S/N 28-7890276 through 28-7990429; PA-28-236, S/N 28-7911001 through 28-7911167; PA-28-201T, S/N 28-7921001 through 28-7921028; PA-28R-201, S/N 28R-7837150 through 28R-7837317; PA-28R-201T, S/N 28R-7803185 through 28R-7803373; PA-28RT-201, S/N 28R-7918001 through 28R-7918128; PA-28RT-201T, S/N 28R-7931001 through 28R-7931187. \n\n\tCompliance is required as indicated, unless already accomplished. \n\n\tTo prevent a potential fire hazard, accomplish the following: \n\n\t(a)\tPrior to the next flight after the effective date of this AD and prior to each flight thereafter until compliance with the requirements of paragraph (b)(1) through (b)(7) have been accomplished, check for evidence of fuel leaks, wetting, fuel stains, and/or fumes at inboard area of both wings, and in the cabin area. Makeappropriate maintenance record entry. \n\n\t(b)\tIf, as a result of checks required by paragraph (a), leakage, wetting, fuel stains or fumes are evident, accomplish the following prior to further flight: \n\n\t\t(1)\tGain access to all Parker-Hannifin unions (identified D1 or D1PH6) located at inboard areas of both wings, under the left cabin side panel and in the spar box area. For 201T models only, include vent line fitting at lower aft corner of the door. \n\n\t\t(2)\tTorque each fitting to the requirements of Table I. \n\n\t\t(3)\tMeasure the distance between the face of union and face of tubing fitting. Refer to Figure I. \n\n\t\t(4)\tIf torque and/or dimensions are not in accordance with the requirements of Table I and Figure I, comply with paragraph (c). \n\n\t\t(5)\tFill the airplane tanks full of fuel and run engine for three (3) to five (5) minutes on each tank. \n\n\t\t(6)\tInspect fittings for leakage and if no leaks are found, no further action is necessary except for the appropriate maintenance record entry. \n\n\t\t(7)\tIf leakage is still evident, comply with the requirements of paragraph (c). \n\n\t(c)\tIf as a result of checks or inspections required by this Airworthiness Directive, the fittings or unions are found damaged, they continue to leak, or they do not comply with the requirements of Table I and Figure I, correct in accordance with (1), (2), or (3) below and accomplish paragraphs (b)(4), (b)(5), and (b)(6). \n\n\t\t(1)\tRemove the leaking union and replace it using a standard "AN" fitting as outlined in AC 43.13-1A, paragraphs 393 and 709, or \n\n\t\t(2)\tReplace with Piper preswaged and preseated tube and union and apply thread lube as outlined in Table II. Carefully align the tube, snug up the nut finger tight, and tighten the nut one (1) to two (2) flats (1/6 to 1/3 of a turn). Maintain dimensional tolerance of Figure I, or \n\n\t\t(3)\tRepair by using the same size Parker-Hannifin unions and fittings which have not been preswaged or preseated. Apply thread lube asoutlined in Table II, snug up the nut finger tight, and using a tube wrench tighten the nut one and one-quarter (1-1/4) turns. \n\n\t(d)\tWithin the next 100 hours time in service after the effective date of this Airworthiness Directive, comply with the requirements of paragraphs (b)(1) through (b)(7), unless already accomplished. \n\n\t(e)\tChecks specified in paragraph (a) may be accomplished by the pilot. \n\n\t(f)\tCompliance with the provisions of this Airworthiness Directive may be accomplished in an equivalent manner approved by the Chief, Engineering and Manufacturing Branch, Southern Region. \n\n\n\n\nTABLE I \nTUBE SIZE\nAPPLIED TORQUE\nEQUIPMENT \n1/4 OD\n75-95 inch pounds\nUse a tubing crows foot\n3/8 OD\n175-195 inch pounds\n\n\n\nTABLE II\nSlip spray lubricant (Dupont), or equivalent.\nFerulube (Parker-Hannifin), or equivalent. \nApply the lubricant to the male connector thread. \nDo not allow lubricant to enter the throat of the connector seat or contact the ferrule seat face.\n\t\n\n\t\n\n\n\tPiper Service Bulletin No. 638 pertains to this subject. \n\n\tThis amendment becomes effective June 8, 1979, except those for whom it became effective May 2, 1979 by airmail letter.