93-05-16 R1 MCDONNELL DOUGLAS: Amendment 39-8698. Docket 93-NM-48-AD. Revises AD 93-05-16, Amendment 39-8520 which superseded AD 91-18-03, Amendment 39-8006. \n\n\tApplicability: Model DC-9 and C-9 (Military) airplanes as listed in McDonnell Douglas DC-9 Alert Service Bulletin A27-327, Revision 2, dated July 14, 1992; and Model DC-9-80 series airplanes and Model MD-88 airplanes as listed in McDonnell Douglas MD-80 Alert Service Bulletin A27-317, Revision 2, dated May 22, 1992; on which the rudder power control valve has not been modified in accordance with McDonnell Douglas Service Bulletin 27-321, dated May 18, 1992, or a production equivalent; certificated in any category. \n\n\tCompliance: Required as indicated, unless accomplished previously. \n\n\tNOTE: This AD requires the same actions as required by AD 93-05-16, amendment 39-8520, but is applicable to additional airplanes. Operators affected by this AD who have accomplished these actions previously in accordance with AD 93-05-16 are considered to be in compliance with this revised AD. \n\n\tTo prevent loss of rudder control, accomplish the following: \n\n\t(a)\tFor airplanes listed in McDonnell Douglas DC-9 Alert Service Bulletin A27-327, Revision 1, dated March 9, 1992, and in McDonnell Douglas MD-80 Alert Service Bulletin A27-317, Revision 2, dated May 22, 1992; on which the retention nut on the slide assembly of the rudder power control valve has not been inspected in accordance with McDonnell Douglas DC-9 Alert Service Bulletin A27-327, dated December 2, 1991, or Revision 1, dated March 9, 1992, or Revision 2, dated July 14, 1992; or McDonnell Douglas MD-80 Alert Service Bulletin A27-317, dated June 17, 1991, or Revision 1, dated January 14, 1992, or Revision 2, dated May 22, 1992: Within 90 days after April 23, 1993 (the effective date of AD 93-05-16, amendment 39-8520), inspect the retention nut on the rudder power control valve slide assembly to determine if a lockwire is installed, in accordance with McDonnell Douglas DC-9 Alert Service Bulletin A27-327, Revision 1, dated March 9, 1992; or McDonnell Douglas MD-80 Alert Service Bulletin A27-317, Revision 2, dated May 22, 1992; as applicable. \n\n\t\t(1)\tIf a lockwire is installed, no further action is required by this AD. \n\n\t\t(2)\tIf a lockwire is not installed, prior to further flight, adjust the retention nut, install a lockwire, and functionally check the rudder power control valve in accordance with the applicable service bulletin. No further action is required by this AD. \n\n\t(b)\tFor airplanes listed in McDonnell Douglas DC-9 Alert Service Bulletin A27-327, Revision 2, dated July 14, 1992, and not affected by paragraph (a) of this AD: Within 90 days after the effective date of this AD, inspect the retention nut on the rudder power control valve slide assembly to determine if a lockwire is installed, in accordance with McDonnell Douglas DC-9 Alert Service Bulletin A27-327, Revision 1, dated March 9, 1992, or Revision 2, dated July 14, 1992. \n\n\t\t(1)\tIf a lockwire is installed, no further action is required by this AD. \n\n\t\t(2)\tIf a lockwire is not installed, prior to further flight, adjust the retention nut, install a lockwire, and functionally check the rudder power control valve in accordance with the applicable service bulletin. No further action is required by this AD. \n\n\t(c)\tModification of the rudder power control valve by replacing the lockwire with a locking tab washer, in accordance with McDonnell Douglas Service Bulletin 27-321, dated May 18, 1992, or a production equivalent, constitutes terminating action for the requirements of this AD. \n\n\t(d)\tAn alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, Los Angeles Aircraft Certification Office (ACO), FAA, Transport Airplane Directorate. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Los Angeles ACO. \n\n\tNOTE: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Los Angeles ACO. \n\n\t(e)\tSpecial flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate the airplane to a location where the requirements of this AD can be accomplished. \n\n\t(f)\tThe inspection, adjustment, installation, and functional check shall be done in accordance with McDonnell Douglas DC-9 Alert Service Bulletin A27-327, Revision 1, dated March 9, 1992; McDonnell Douglas DC-9 Alert Service Bulletin A27-327, Revision 2, dated July 14, 1992; or McDonnell Douglas MD-80 Alert Service Bulletin A27-317, Revision 2, dated May 22, 1992; as applicable. The modification shall be done in accordance with McDonnell Douglas Service Bulletin 27-321, dated May 18, 1992. The incorporation by reference of McDonnell Douglas DC-9 Alert Service Bulletin A27-327, Revision 2, dated July 14, 1992, was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR Part 51. The incorporation by reference of McDonnell Douglas DC-9 Alert Service Bulletin A27-327, Revision 1, dated March 9, 1992; McDonnell Douglas MD-80 Alert Service Bulletin A27-317, Revision 2, dated May 22, 1992; and McDonnell Douglas Service Bulletin 27-321, dated May 18, 1992; was approved previously by the Director of the Federal Register as of April 23, 1993 (58 FR 15760, March 24, 1993). Copies may be obtained from McDonnell Douglas Corporation, P.O. Box 1771, Long Beach, California 90846-1771, Attention: Business Unit Manager, Technical Publications - Technical Administrative Support, C1-L5B. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the FAA, Los Angeles Aircraft Certification Office, 3229 East Spring Street, Long Beach, California; or at the Office of the Federal Register,800 North Capitol Street, NW., suite 700, Washington, DC. \n\n\t(g)\tThis amendment becomes effective on November 18, 1993.