87-17-08: Fuel Purge Valve

87-17-08 SHORT BROTHERS PLC: Amendment 39-5712. Applies to Model SD3-60 airplanes, serial numbers SH3601 through SH3678, certificated in any category. Compliance required as indicated, unless previously accomplished. To ensure that failure of the fuel purge valve cannot result in fuel ingress into the main cabin, accomplish the following: A. Within 90 days after the effective date of this AD, apply sealant to the fuselage top skin in accordance with the "Accomplishment Instructions," of Short Service Bulletin SD360- 53-22, Revision 1, dated April 1986. 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, Standardization Branch, ANM-113, 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 modifications required by this AD. All persons affected by this directive who have not already received the appropriate service document from the manufacturer may obtain copies upon request to Shorts Aircraft, 2011 Crystal Drive, Suite 713, Arlington, Virginia 22202-3702. This document 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 September 22, 1987.