81-10-10 R1 MCDONNELL DOUGLAS: Amendment 39-4116 as amended by Amendment 39-4629. Applies to all McDonnell Douglas Model DC-9 series and Military C-9 series airplanes, certificated in all categories. Compliance required as prescribed herein. To prevent fatigue cracking and possible structural failure of the forward galley service doors, P/N 5910084 and P/N 5910538, on airplanes with 12,000 or more landings accumulated on and after the effective date of this AD, accomplish the following: \n\n\tA.\tWithin the next 30 days after the effective date of this amendment, unless accomplished within the last 3,100 landings, perform an operational check of the door, and a visual inspection for general condition of door, pan and seals, door stops, and set screws. If corrective actions are deemed necessary, accomplish rework and/or replacement per operator's approved maintenance program. \n\n\tNOTE: Removal of seals and liner not required to perform this inspection. \n\n\tB.\tIn accordance withthe schedule below, perform a close visual inspection of the door pan, forward and aft ends of horizontal beams (frames), including the bend radius along the upper and lower flanges, tee fittings and clips, or inspect in accordance with McDonnell Douglas DC-9 Service Bulletins 52-125 dated August 11, 1981, or 52-127 dated January 10, 1983, as applicable. \n\n\tNOTE: Removal of seals is not required to perform this inspection. \n\n\t\t1.\tInitial visual inspection schedule (unless accomplished within the last 3,100 landings): \n\n\n Accumulated Landings\n(on effective date of this AD)\nInitial Inspection\n (from effective date of this AD) \n12,000 - 14,999\t\n4,000 landings\n15,000 - 19,999\t\n2,900 landings \n20,000 - 24,999\t\n1,800 landings \n 25,000 and over\t\n 900 landings \n \t\t\t\n\n\tNOTE: If the total number of landings cannot be determined for a particular door, for the purpose of this AD it must be assumed the door has 25,000 or more landings. \n\n\t\t2.\tRepeat the inspections specified in paragraph B.1., above, at intervals not to exceed 4,000 landings from the last inspection until terminating action specified in paragraph C., below, is accomplished. \n\n\t\t3.\tFor airplanes with less than 12,000 landings on the effective date of this AD, inspect in accordance with paragraph B., above, before the accumulation of 16,000 landings. \n\n\t\t4.\tIf no cracks are found, continue repetitive inspections per paragraph B.2., above, until terminating actions specified in paragraph C.1., below, is accomplished. \n\n\t\t5.\tIf cracks are found, install applicable repairs on cracked pan and/or beams and accomplish repetitive inspections per paragraph B.2., above, until terminating action specified in paragraph C.2., below, is accomplished. For Part Numbers 5910084-(***) and 5910538-(***), with cracks which exceed the limits defined in Douglas Service Rework Drawing 5939988 or J060167, respectively, the affected beam(s) must be replaced with new like beam(s) prior to installing preventative repairs. \n\n\t(NOTE: *** denotes any configuration.) \n\n\t\t6.\tPrevious accomplishment of preventative repairs, required by this AD, which are outlined in McDonnell Douglas Service Rework Drawing 5939988, may be considered as equivalent methods for complying with the requirements of this AD. \n\n\tC.\tTerminating Action: The following constitutes terminating action for this AD: \n\n\t\t1.\tFor aircraft found to be crack free, accomplish the applicable preventative repair per Paragraph 2, Accomplishment Instructions specified in McDonnell Douglas DC-9 Service Bulletins 52-125 dated August 11, 1982, or 52-127 dated January 10, 1983, or later revisions approved by the Manager, Los Angeles Aircraft Certification Office, FAA, Northwest Mountain Region. \n\n\t\t2.\tFor aircraft found to have cracks, accomplish the applicable repairs and inspections and install preventative repairs per paragraph 2, Accomplishment Instructions, specified in McDonnell Douglas DC-9 Service Bulletins 52-125 dated August 11, 1982, or 52-127 dated January 10, 1983, or later revisions approved by the Manager, Los Angeles Aircraft Certification Office, FAA, Northwest Mountain Region. \n\n\tD.\tSpecial flight permits may be issued in accordance with FARs 21.197 and 21.199 to operate airplanes to a base in order to comply with the requirements of this AD. \n\n\tE.\tUpon request of the operator, an FAA maintenance inspector, subject to prior approval by the Manager, Los Angeles Aircraft Certification Office, FAA, Northwest Mountain Region, may adjust the repetitive inspection intervals specified in this AD to permit compliance at an established inspection period of the operator if the request contains substantiating data to justify the change for that operator. \n\n\tF.\tFor the purposes of complying with this AD, subject to the acceptance by the assigned FAA Maintenance Inspector, the number of landings may be determined by dividing each airplane's hours time in service by the operator's fleet average time from takeoff to landing. \n\n\tG.\tAlternative inspections, repairs, or other actions accomplished on or after the effective date of this AD, which provide an equivalent level of safety, may be used when approved by the Manager, Los Angeles Aircraft Certification Office, FAA, Northwest Mountain Region. to 5 U.S.C. 552(a)(1). \n\n\tAll persons affected by this directive who have not already received these documents from the manufacturer may obtain copies upon request to McDonnell Douglas Corporation, 3855 Lakewood Boulevard, Long Beach, California 90846, Attention: Director, Publications and Training, C1-750 (54-60). These documents also may be examined at FAA, Northwest Mountain Region, 17900 Pacific Highway South, Seattle, Washington, or Los Angeles Aircraft Certification Office, 4344 Donald Douglas Drive, Long Beach, California. \n\n\tAmendment 39-4116 became effective May 28, 1981. \n\n\tThis Amendment 39-4629 becomes effective April 20, 1983.