Airworthiness directives › 2019-17-01
AD 2019-17-01 Airworthiness Directives; Learjet, Inc. Airplanes
Models named: 60. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to Learjet, Inc., Model 60 airplanes, certificated in any category, having serial numbers 60-002 through 60-430 inclusive, and having a configuration identified in paragraph (c)(1) or (2) of this AD. (1) Airplanes with a dorsal-mounted oxygen bottle. (2) Airplanes that have had the dorsal mounted oxygen bottle removed but have retained the oxygen line fairing installed on top of the fuselage.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
At the applicable compliance times specified in paragraphs (g)(1) through (3) of this AD, do the fluorescent dye penetrant inspection of the fuselage skin for corrosion. Before further flight, do all related investigative and corrective actions. Follow the Accomplishment Instructions of Bombardier Learjet 60 Service Bulletin 60-53-19, Revision 3, dated August 29, 2016, (SB 60-53-19, Revision 3) except as required by paragraph (h) of this AD. (1) As of May 22, 2017 (the effective date of AD 2017-08-07, Amendment 39-18856 (82 FR 18084, April 17, 2017) (“2017-08-07”), which was superseded by AD 2017-11-09), any airplanes with more than 12 years since the date of issuance of the original airworthiness certificate or the date of issuance of the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whichever date is earlier: Inspect within 12 months after May 22, 2017 (the effective date of AD 2017-08-07, which was superseded by 2017-11-09). (2) As of May 22, 2017 (the effective date of AD 2017-08-07, which was superseded by AD 2017-11-09), any airplanes with more than 6 years but equal to or less than 12 years since the date of issuance of the original airworthiness certificate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whichever date is earlier: Inspect within 24 months after May 22, 2017 (the effective date of AD 2017-08-07, which was superseded by AD 2017-11-09). (3) As of May 22, 2017 (the effective date of AD 2017-08-07, which was superseded by AD 2017-11-09), any airplanes with 6 years or less since the date of issuance of the original airworthiness certificate or the date of issuance of the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: Inspect within 36 months after May 22, 2017 (the effective date of AD 2017-08-07, which was superseded by AD 2017-11-09).
Unsafe condition
This AD was prompted by an evaluation by the design approval holder indicating that the upper fuselage skin under the aft oxygen line fairing is subject to multi-site damage. The FAA is issuing this AD to detect and correct corrosion of the fuselage skin, which could result in reduced structural integrity of the airplane.
Affected ADs
This AD replaces AD 2017-11-09, Amendment 39-18908 (82 FR 24462, May 30, 2017) (“AD 2017-11-09”).
Read the original on the Federal Register →
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1