81-02-09 BOEING: Amendment 39-4024. Applies to all Boeing Model 727-100 and 727-100C series airplanes equipped with the aft airstair emergency extension system, except all-cargo configurations and those airplanes where the aft stair emergency extension system has been deactivated.\n \n\tCompliance is required as indicated. Accomplish the following:\n \n\tA.\tPrior to June 1, 1981, replace or modify the aft airstair emergency extension control handle in a manner approved by the Chief, Seattle Area Aircraft Certification Office, FAA Northwest Region. (Note: Accomplishment of Boeing Service Bulletin 727-52-120 dated March 21, 1980, or later FAA approved revisions has been approved as a means of compliance with the requirements of this AD.) \n\n\tB.\tUpon request of the operator, an FAA aviation safety inspector, subject to prior approval by the Chief, Seattle Area Aircraft Certification Office, FAA Northwest Region, may adjust the compliance date if the request contains substantiating data to justify the change. \n\n\tThis amendment becomes effective April 1, 1981.