AD 87-24-09

87-24-09 BOEING: Amendment 39-5777. Applies to Model 747 and Model 767 series airplanes, specified in Boeing Service Bulletins 747-34A2286 dated April 30, 1987, and 767- 34A0055, Revision 1, dated September 17, 1987, certificated in any category. Compliance required within 12 months after the effective date of this AD, unless previously accomplished.

To minimize the possibility of misleading localizer deviation indication to the flight crew caused by electromagnetic interference, accomplish the following:

A. Replace the existing weather radar receiver-transmitters with modified receiver- transmitters in accordance with the appropriate Boeing Service Bulletin 747-34A2286, or 767- 34A0055, both dated April 30, 1987, or later FAA-approved revision.

B. An 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.

C. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base for the accomplishment of the modification required by this AD.

All persons affected by this directive who have not already received the appropriate service documents from the manufacturer may obtain copies upon request to the Boeing Commercial Airplane Company, P.O. Box 3707, Seattle, Washington 98124-2207. These documents may be examined at the FAA, Northwest Mountain Region, 17900 Pacific Highway South, Seattle, Washington, or the Seattle Aircraft Certification Office, 9010 East Marginal Way South, Seattle, Washington.

This amendment becomes effective December 29, 1987.