76-14-06: Fuel Leak Prevention

76-14-06 BOEING: Amendment 39-2664. Applies to all Boeing 747 series airplanes certificated in all categories. Compliance required as indicated. \n\tWithin 20 days after the effective date of this Airworthiness Directive, accomplish the following: \n\t1.\tInspect the dry bay areas between the outboard reserve tanks, wing station 1280, and the surge tanks, wing station 1485, for evidence of fuel leaks, unless already accomplished per Boeing service letter 747-SL-28-3 dated June 11, 1976. Verify the existence of a clear drain path through each vent/drain hole and stringer limber hole to prevent accumulation of fluids. Repair leaks per Boeing 747 Maintenance Manual Chapter 28-11-00, Figure 802. Aircraft exhibiting leakage rates exceeding Maintenance Manual limits must be repaired before further flight, except that the airplane may be flown in accordance with FAR 21.197 to a base where the repair can be performed. Clean all dry bay access door clamp rings and wing skin mating surfaces. Tighten all attach bolts to 35-40 inch-pounds of torque. This inspection is not required on 747-SP airplanes with active 2 and 3 reserve tanks and 747-200 airplanes with auxiliary fuel tanks. \n\t2.\tUnless already accomplished per Boeing service letter 747-SL-28-4 dated June 21, 1976, inspect all engine struts for evidence of fuel leakage. Inspections shall be accomplished by gaining access on the left side of each nacelle strut through the B, C, and D panels with prefix numbers 452, 462, 472, or 482. Repair all fuel leaks per Boeing Maintenance Manual Chapter 28-22-07 before further flight, except that the airplane may be flown in accordance with FAR 21.197 to a base where the repair can be performed. \n\t3.\tUnless already accomplished per Boeing service letter 747-SL-28-5 dated June 21, 1976, inspect overwing fuel filler caps for approved part numbers 10-3297-119 (GABB P/N 38222-2) or 10-3297-147 (GABB P/N 38222-3) and determine that non-metallic lanyards are installed, or provide corrective action in a manner approved by the Chief, Engineering and Manufacturing Branch, FAA, Northwest Region.\n \tReport all findings to the Chief, Engineering and Manufacturing Branch, FAA, Northwest Region, 9010 East Marginal Way South, Seattle, Washington 98108 through the assigned FAA principal maintenance inspector. The report must include the following: \n\t(1)\tAirplane serial number. \n\t(2)\tAirplane total time. \n\t(3)\tDescription of condition and location of leaks. (Reporting approved by the Office of Management and Budget under OMB No. 04-R0174). \n\tThe manufacturer's specifications and procedures identified and described in this directive are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(i). \n\tAll persons affected by this directive who have not already received these documents may obtain copies by request to the Boeing Company, P. O. Box 3707, Seattle, Washington 98124. These documents may also be examined at FAA, Northwest Region, 9010 East Marginal Way South, Seattle, Washington. \n\n\tThis amendment becomes effective upon publication in the Federal Register for all persons except those to whom it was made effective immediately by telegram dated June 25, 1976.