Airworthiness directives › 2021-23-08
AD 2021-23-08 Airworthiness Directives; Learjet Inc. Airplanes
Applicability*9
This AD applies to Learjet Inc. Model 45 (Learjet 40), Model 45 (Learjet 45), Model 45 (Learjet 70), and Model 45 (Learjet 75) airplanes, serial numbers 45-002 through 45-596 and 45-2001 through 45-2146, certificated in any category.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Use the following service bulletin, as applicable to your airplane model configuration, to perform the actions required by paragraph (h) of this AD: (1) Bombardier Learjet 40 Service Bulletin 40-57-06, Revision 1, dated October 26, 2020; (2) Bombardier Learjet 45 Service Bulletin 45-57-13, Revision 1, dated October 26, 2020; (3) Bombardier Learjet 70 Service Bulletin 70-57-02, Revision 1, dated October 26, 2020; or (4) Bombardier Learjet 75 Service Bulletin 75-57-01, Revision 2, dated April 19, 2021.
Unsafe condition
This AD was prompted by reports of corrosion found on the upper surface of the lower center wing mid spar splice plate. The FAA is issuing this AD to detect and correct corrosion or deterioration of protective treatments on the center wing area. The unsafe condition, if not addressed, could result in failure of the wing centerline joint and lead to partial wing separation with consequent loss of control of the airplane.
Affected ADs
None.
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