Airworthiness directives › 2022-03-02
AD 2022-03-02 Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes
Models named: DHC-8-401, -402. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to De Havilland Aircraft of Canada Limited Model DHC-8-401 and -402 airplanes, certificated in any category, serial numbers 4001 and 4003 through 4628 inclusive.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Within 8,000 flight hours after the effective date of this AD: Do the actions specified in paragraph (g)(1) or (2) of this AD. (1) Replace the #6 outer wing fuel access panel assembly in accordance with Section 3.B., Part A, of the Accomplishment Instructions of De Havilland Aircraft of Canada Limited Service Bulletin 84-57-35, Revision B, dated June 9, 2021. (2) Rework the #6 outer wing fuel access panel assembly, including an eddy current or fluorescent liquid penetrant inspection for crack indications of the rework area, in accordance with Section 3.B., Part B, of the Accomplishment Instructions of De Havilland Aircraft of Canada Limited Service Bulletin 84-57-35, Revision B, dated June 9, 2021. If any crack indication is found, before further flight, repair using a method approved in accordance with the procedures specified in paragraph (j)(2) of this AD.
Unsafe condition
This AD was prompted by reports of a possible hard contact between the #2 top high level sensor (HLS) terminal screw head and the #6 outer wing fuel access panel stiffener flange. The FAA is issuing this AD to address the possibility of electrical arcing during a lightning strike, which could be a source of ignition inside the fuel tank.
Affected ADs
None.
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