77-02-02\tBOEING: Amendment 39-2811. Applies to Boeing Model 727-100 and -200 series airplanes certificated in all categories with .047" dia. static sensing holes. Compliance required within 3000 hours time in service after the effective date of this AD unless already accomplished. \n\tTo prevent fluctuations in airspeed and altitude information due to water being ingested and retained in the static port fittings, enlarge the static port sensing holes from .047" dia. to .125" dia. in accordance with Boeing Service Bulletin 727-34-94 (to be released) or later FAA approved service bulletins, or in a manner approved by the Chief, Engineering and Manufacturing Branch, FAA Northwest Region. \n\tBoeing 727-100 airplanes already incorporating Boeing S.B. 727-25-42, Revision 1, dated March 4, 1968, with elbow fitting MS21908D6, and Boeing S.B. 727-34-57, dated April 7, 1968, enlarging the static sensing holes, are in compliance with this AD. \n\tThe manufacturer's specifications and proceduresidentified and described in this directive are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). \n\tAll persons affected by this directive who have not already received these documents from the manufacturer may obtain copies upon request to Boeing Commercial Airplane Company, P. O. Box 3707, Seattle, Washington 98124. The documents may also be examined at FAA Northwest Region, 9010 East Marginal Way South, Seattle, Washington. \n\tThis amendment becomes effective February 22, 1977.