Airworthiness directives › 2020-25-01
AD 2020-25-01 Airworthiness Directives; Textron Aviation, Inc. Airplanes (Type Certificate Previously Held by Beechcraft Corporation)
Makes named: textron aviation. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to the Textron Aviation Inc., (Textron) (type certificate previously held by Beechcraft Corporation) airplanes, certificated in any category, identified in table 1 to paragraph (c) of this AD: ER07DE20.006
Compliance
Comply with this AD within the compliance times specified below, unless already done.
Required actions
(1) Within the next 200 flight hours after the effective date of this AD or within 12 months after the effective date of this AD, whichever occurs later, inspect each washer assembly attached to the left and right lower forward wing bolts and remove all part number 90-380058-1 washers in accordance with the Accomplishment Instructions, paragraphs 3 through 5, of Beechcraft Mandatory Service Letter MTL-57-01, Revision 1, dated September 19, 2018 (MTL-57-01, Revision 1). In all locations where a washer part number 90-380058-1 was removed, do the following: (i) Inspect the bolt, nut, and fitting in accordance with the Accomplishment Instructions, paragraph 6, of MTL-57-01, Revision 1. If there is a crack in the fitting, replace the fitting before further flight. (ii) Install a part number 90-380019-1 washer in accordance with the Accomplishment Instructions, paragraph 7, of MTL-57-01, Revision 1. (2) As of the effective date of this AD, do not install washer part number 90-380058-1 on any airplane listed in table 1 to paragraph (c) of this AD.
Unsafe condition
This AD was prompted by information provided by Textron that a washer assembly may provide premature torque indication that could lead to cracking of the wing fitting. The FAA is issuing this AD to prevent such fatigue cracks. The unsafe condition, if not addressed, could result in failure of the forward lower wing fitting, which could lead to wing separation and loss of airplane control.
Affected ADs
None.
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