Summary
We are adopting a new airworthiness directive (AD) for certain Boeing Model 747 airplanes. This AD requires modification of the refuel valve control unit for the reserve fuel tanks. This AD also requires a revision to the FAA-approved maintenance program to incorporate airworthiness limitation (AWL) No. 28-AWL-20 or AWL No. 28-AWL-25, as applicable. This AD results from fuel system reviews conducted by the manufacturer. We are issuing this AD to prevent lightning-induced electrical energy from entering a reserve fuel tank through the refuel valve, which could result in a fuel tank explosion and consequent loss of the airplane.
Directive Details
AD Number
FAA-2008-0091
Document Number
E8-20364
Type
Rule
Publication Date
September 12, 2008
Effective Date
October 17, 2008
Affected Manufacturer
Boeing Model 747
Criticality
important
Emergency
No
Docket ID
Docket No. FAA-2008-0091
Topics
Official Documents
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