AD 90-15-03

90-15-03 BOEING: Amendment 39-6650. Docket No. 89-NM-248-AD.

Applicability: Model 737-300 and 737-400 series airplanes, listed in Boeing Service Bulletin 737-28-1084, dated September 14, 1989, certificated in any category.

Compliance: Required within three months after the effective date of this AD, unless previously accomplished.

To prevent a fire hazard associated with a fuel leak, due to the fuel tube assembly chafing against the adjacent wing/strut structural brace, accomplish the following:

A. Accomplish one of the following:

1. Inspect the left engine fuel feed tube assembly for proper clearance and chafing in accordance with Boeing Service Bulletin 737-28-1055 Revision 1, dated October 27, 1988. If inadequate clearance is found, prior to further flight, replace the fuel tube with a serviceable fuel tube, in accordance with Boeing Service Bulletin 737-28-1084, dated September 14, 1989, and verify minimum clearance between support structure and fuel tube, in accordance with the above Service Bulletin 737-28-1055, Revision 1, dated October 27, 1988.

2. Replace the left engine fuel feed tube in accordance with Boeing Service Bulletin 737-28-1084, dated September 14, 1989, and verify minimum clearance between support structure and fuel tube in accordance with Service Bulletin 737-28-1055, Revision 1, dated October 27, 1988.

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 (ACO), FAA, Transport Airplane Directorate.

NOTE: The request should be submitted directly to the Manager, Seattle ACO, and a copy sent to the cognizant FAA Principal Inspector (PI). The PI will then forward comments or concurrence to the Seattle ACO.

C. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base in order to comply with the requirements of 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 Boeing Commercial Airplanes, P.O. Box 3707, Seattle, Washington 98124. These documents may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 17900 Pacific Highway South, Seattle, Washington, or Seattle Aircraft Certification Office, 9010 East Marginal Way South, Seattle, Washington.

This amendment (39-6650, AD 90-15-03) becomes effective on August 14, 1990.