Airworthiness directives › 2020-18-16
AD 2020-18-16 Airworthiness Directives; The Boeing Company Airplanes
Models named: 767-200, -300, -300F, -400ER series. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to The Boeing Company Model 767-200, -300, -300F, and -400ER series airplanes, certificated in any category, excluding airplanes identified in paragraphs (c)(1) through (3) of this AD. (1) Airplanes on which the center auxiliary tank consists only of the spaces between the side of body rib 0 and rib 3 of the left and right wings ( i.e., the wing center structural box is a dry bay and is not part of the fuel tank). (2) Airplanes equipped with a flammability reduction means (FRM) approved by the FAA as compliant with the fuel tank flammability reduction (FTFR) requirements of 14 CFR 25.981(b) or 26.33(c)(1). (3) Airplanes equipped with an ignition mitigation means (IMM) approved by the FAA as compliant with the FTFR requirements of 14 CFR 25.981(c) or 26.33(c)(2).
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Within 72 months after the effective date of this AD, modify the fuel quantity indicating system (FQIS) to prevent development of an ignition source inside the center fuel tank due to electrical fault conditions, using a method approved in accordance with the procedures specified in paragraph (j) of this AD.
Unsafe condition
This AD was prompted by the FAA's analysis of the Model 767 fuel system reviews conducted by the manufacturer. The FAA is issuing this AD to prevent ignition sources inside the center fuel tank, which, in combination with flammable fuel vapors, could result in a fuel tank explosion and consequent loss of the airplane.
Affected ADs
None.
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