89-26-06 R1 BOEING: Amendment 39-6424 as amended by Amendment 39-6656. Docket No. 88-NM-177-AD. \n\n\tApplicability: Model 737-300, 757, and 767 series airplanes, listed in Boeing Alert Service Bulletins 737-35A1029, Revision 2, dated September 29, 1988; 757-35A0006, Revision 1, dated March 10, 1988; and 767-35A0014, dated December 17, 1987; certificated in any category. \n\n\tCompliance: Required within the next 3,000 hours time-in-service after the effective date of this AD, unless previously accomplished. \n\n\tTo prevent failure of the oxygen generator to activate when required, accomplish the following: \n\n\tA.\tInspect Puritan chemical generators, P/N 117003-13, for serial numbers 06339 through 06559, and replace those units in accordance with Puritan-Bennett Service Bulletin 117003-13-35-1, dated December 17, 1987. \n\n\tB.\tInspect, and if installed, replace 1 1/2-turn oxygen generator lanyard pull rings with 2-turn pull rings, as follows: \n\n\t\t1.\tFor Model 767 series airplanes, in accordance with Boeing Alert Service Bulletin 767-35A0014, dated December 17, 1987, or Revision 1, dated April 13, 1989; \n\n\t\t2.\tFor Model 757 series airplanes, in accordance with Boeing Alert Service Bulletin 757-35A0006, Revision 1, dated March 10, 1988, or Revision 2, dated June 29, 1989; \n\n\t\t3.\tFor Model 737-300 series airplanes, in accordance with Boeing Alert Service Bulletin 737-35A1029, Revision 2, dated September 29, 1988, or Revision 3, dated June 29, 1989. \n\n\tC.\tAn alternate means of compliance or adjustment of the compliance time, which provides an acceptable level of safety, may be used when approved by the Manager, Seattle Aircraft Certification Office, FAA, Northwest Mountain Region. \n\n\tNOTE: The request should be forwarded through an FAA Principal Maintenance Inspector (PMI), who will either concur or comment, and then send it to the Manager, Seattle Aircraft Certification Office. \n\n\tD.\tSpecial flight permits may be issued in accordance with FAR 21.197and 21.199 to operate airplanes to a base in order to comply with the requirements of this AD. \n\n\tAll persons affected by this directive who have not already received the appropriate service documents from the manufacturer may obtain copies upon request to Boeing Commercial Airplanes, P.O. Box 3707, Seattle, Washington 98124 and the Puritan-Bennett Aero Systems Co., Attn: Customer Services Dept., 10800 Pflumm Road, Lenexa, Kansas 66215. These documents may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 17900 Pacific Highway South, Seattle, Washington, 98168 or Seattle Aircraft Certification Office, 9010 East Marginal Way South, Seattle, Washington 98108. \n\n\tThe effective date for the requirements of this amendment remains January 17, 1990, as specified in Amendment 39-6424, AD 89-26-06. \n\tThis amendment (39-6656, AD 89-26-06 R1) is effective on July 17, 1990.