AD 79-17-01

79-17-01 ROCKWELL INTERNATIONAL: Amendment 39-3525. Applies to Rockwell NA-265-60 airplanes which have been modified by Raisbeck Group Supplemental Type Certificate SA687NW. To prevent flutter caused by the accumulation of undrained water in the elevators, accomplish the following, unless already accomplished, within 30 days or 30 flight hours, whichever occurs first:

A. Modify the elevators to provide water drainage provisions in accordance with Raisbeck Service Bulletin No. 8, dated July 13, 1979, or later FAA approved revisions.

B. Using the procedure specified in Raisbeck Service Bulletin No. 8, dated July 13, 1979, or later FAA approved revisions, determine the static balance of the elevators and if required, rebalance them in accordance with instructions in that service bulletin.

C. Equivalent modifications may be approved by the Chief, Engineering and Manufacturing Branch, Northwest Region.

The manufacturer's specifications and procedures identified and described in this directive are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive who have not already received these documents from the manufacturer, may obtain copies upon request to The Raisbeck Group, 7777 Perimeter Road South, Boeing Field International, Seattle, Washington 98108. These documents may also be examined at FAA Northwest Region, 9010 East Marginal Way South, Seattle, Washington 98108.

This amendment becomes effective August 15, 1979.