66-27-02 BOEING: Amdt. 39-303 Part 39 Federal Register November 9, 1966. Applies to Model 707-300, -300B, -300C, and -400 Series Airplanes.\n \n\tCompliance required as indicated.\n \n\tTo detect cracks of the elevator nose structure in the outboard balance bay, accomplish the following:\n \n\t(a)\tWithin the next 800 hours' time in service after the effective date of this AD, unless accomplished within the last 800 hours' time in service, and thereafter at intervals not to exceed 1,600 hours' time in service from the last inspection until modified in accordance with (h), inspect elevators of Model 707-300 and -400 Series airplanes with 20,000 or more hours' time in service on the effective date of this AD, and elevators of Model 707-300B Series airplanes with 12,000 or more hours' time in service on the effective date of this AD in accordance with (f).\n \n\t(b)\tWithin the next 200 hours' time in service after the effective date of this AD, unless accomplished within the last 200 hours' time in service, and thereafter at intervals not to exceed 400 hours' time in service from the last inspection until modified in accordance with (h), inspect elevators of Model 707-300C Series airplanes with 2,000 or more hours' time in service on the effective date of this AD in accordance with (f). \n\n\t(c)\tBefore the accumulation of 20,800 hours' time in service and thereafter at intervals not to exceed 1,600 hours' time in service from the last inspection until modified in accordance with (h), inspect elevators of Model 707-300 and -400 Series airplanes with less than 20,000 hours' time in service on the effective date of this AD in accordance with (f).\n \n\t(d)\tBefore the accumulation of 12,800 hours' time in service and thereafter at intervals not to exceed 1,600 hours' time in service from the last inspection until modified in accordance with (h), inspect elevators of Model 707-300B Series airplanes with less that 12,000 hours' time in service on the effective date of this ADin accordance with (f). \n\n\t(e)\tBefore the accumulation of 2,200 hours' time in service and thereafter at intervals not to exceed 400 hours' time in service from the last inspection until modified in accordance with (h), inspect elevators of Model 707-300C Series airplanes with less than 2,000 hours' time in service on the effective date of this AD in accordance with (f).\n \n\t(f)\tVisually inspect for cracks in the leading edge of the elevators in bays No. 4 and No. 5 in accordance with paragraph 3, Part I, Boeing Service Bulletin No. 2386 (R-1), or later FAA- approved revision, except that the initial inspection of Bay No. 4 need not be accomplished until the next repetitive inspection of Bay No. 5 is required, if Bay No. 5 has been inspected in accordance with this paragraph.\n \n\t(g)\tIf cracks are found during the inspections specified in (f), before further flight, repair or replace cracked parts in accordance with the FAA-approved Structural Repair Manual or repair the elevatorin accordance with paragraph 3, Part II, Boeing Service Bulletin No. 2386(R- 1), or later FAA-approved revision or an equivalent approved by the Chief, Aircraft Engineering Division, FAA Western Region. \n\n\t(h)\tAfter the elevators have been modified in accordance with paragraph 3, Part II, Boeing Service Bulletin No. 2386(R-1) or later FAA-approved revision or an equivalent approved by the Chief, Aircraft Engineering Division, FAA Western Region, the repetitive inspections required by this AD may be discontinued.\n \n\t(i)\tUpon request of the operator, an FAA maintenance inspector, subject to prior approval of the Chief, Aircraft Engineering Division, FAA Western Region, may adjust the repetitive inspection intervals specified in this AD to permit compliance of an established inspection period of the operator, if the request contains substantiating data to justify the increase for that operator.\n \n\tThis directive effective November 9, 1966.