Airworthiness Directive · Amendment 39-21806 · Wing, center box
Learjet Inc. Airplanes
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.
The FAA is adopting a new airworthiness directive (AD) for certain Learjet Inc. (Learjet) Model 45 airplanes. This AD was prompted by reports of corrosion found on the upper surface of the lower center wing mid spar splice plate. This AD requires repetitively inspecting the center wing area for corrosion and deterioration of protective treatments, removing any corrosion, and treating any deteriorated areas. The FAA is issuing this AD to address the unsafe condition on these products.
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.
At the applicable initial compliance time specified in paragraph (h)(1) or (2) of this AD and thereafter at intervals not to exceed 8 years, inspect the center wing area for corrosion and deterioration of protective treatments and perform all related corrective actions by following the Accomplishment Instructions, steps 3.A. and 3.B., of the applicable service bulletin listed in paragraph (g) of this AD.
(1) For airplanes with 8 or fewer years since the date of issuance of the original airworthiness certificate or the date of issuance of the original export certificate of airworthiness, whichever date is earlier: Before or upon accumulating 8 years or within 12 months after the effective date of this AD, whichever occurs later; or
(2) For airplanes that have accumulated more than 8 years since the date of issuance of the original airworthiness certificate or the date of issuance of the original export certificate of airworthiness, whichever date is earlier: Within 12 months after the effective date of this AD.
Where Bombardier Learjet 40 Service Bulletin 40-57-06, Revision 1, dated October 26, 2020, Bombardier Learjet 45 Service Bulletin 45-57-13, Revision 1, dated October 26, 2020, Bombardier Learjet 70 Service Bulletin 70-57-02, Revision 1, dated October 26, 2020, and Bombardier Learjet 75 Service Bulletin 75-57-01, Revision 2, dated April 19, 2021, specify contacting Learjet Inc. for appropriate action: Before further flight, repair using a method approved in accordance with the procedures specified in paragraph (l) of this AD.
Within 30 days after completing the initial inspection required by paragraph (h) of this AD or within 30 days after the effective date of this AD, whichever occurs later, submit a report of the findings (both positive and negative) of the inspection to: Wichita-COS@faa.gov; or Ann Johnson, Wichita ACO Branch, FAA, 1801 Airport Road, Wichita, KS 67209. This reporting requirement is limited to the initial inspection results only. The report must include: The name of the owner; the address of the owner; the name of the organization doing the actions required by this AD; the date the inspection was completed; the name of the person submitting the report; the address, telephone number, and email of the person submitting the report; the airplane serial number; the date of issuance of the original airworthiness certificate, or the date of issuance of the original export certificate of airworthiness (whichever date is earlier); whether protective treatments are deteriorated, and if so, the location of deteriorated areas; whether corrosion was detected, and if so, the location of corrosion; and a list of parts replaced if the level of corrosion required replacement of parts.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
