AD 2012-08-08 Airworthiness Directives; Learjet Inc.

Models named: 45. Read the applicability below — it usually turns on serial or part numbers too.

(1) This AD applies to all Learjet Inc., Model 45 airplanes, certificated in any category. (2) This AD requires revisions to certain operator maintenance documents to include new actions (e.g. inspections). Compliance with these actions is required by 14 CFR 91.403(c). For airplanes that have been previously modified, altered, or repaired in the areas addressed by these actions, the operator may not be able to accomplish the inspections described in the revisions. In this situation, to comply with 14 CFR 91.403(c), the operator must request approval for an alternative method of compliance according to paragraph (i) of this AD. The request should include a description of changes to the required actions that will ensure the continued operational safety of the airplane. The FAA has provided guidance for this determination in FAA Advisory Circular (AC) 25.1529-1A, dated November 20, 2007. http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgAdvisoryCircular.nsf/list/AC%2025.1529-1A/$FILE/AC%2025.1529-1A.pdf.

Comply with this AD within the compliance times specified, unless already done.

Within 90 days after the effective date of this AD, revise the maintenance program by incorporating the applicable inspection reference number (IRN) tasks identified in table 1 of this AD, as specified in Chapter 04, Airworthiness Limitations, of the Bombardier Learjet 45 Maintenance Manual MM-104, Revision 53, dated January 10, 2011; or Bombardier Learjet 40 Maintenance Manual MM-105, Revision 21, dated January 10, 2011; as applicable. The initial task compliance time is within 90 days after the effective date of this AD, or the applicable initial compliance time specified in table 1 of this AD, whichever is later. Note 1 to paragraph (g) of this AD: IRN #R2710041 shown in table 1 of this AD is identified as IRN # N2710041 in prior revisions of Bombardier Learjet 45 Maintenance Manual MM-104, and Bombardier Learjet 40 Maintenance Manual MM-105. Table 1—IRN Task Revision Model— IRN #— Initial compliance time— Chapter 04 of these documents— Model 40, 45 R2710041 Within 10 years after the date of issuance of the original standard airworthiness certificate or the date of issuance of the original export certificate of airworthiness, or within 10 years after the most recent replacement, whichever occurs later Bombardier Learjet 45 Maintenance Manual MM-104, Revision 53, dated January 10, 2011; or Bombardier Learjet 40 Maintenance Manual MM-105, Revision 21, dated January 10, 2011; as applicable. Model 40, 45 Q5510091 Within 600 flight hours after the most recent inspection done in accordance with IRN # Q5510091 Bombardier Learjet 45 Maintenance Manual MM-104, Revision 53, dated January 10, 2011; or Bombardier Learjet 40 Maintenance Manual MM-105, Revision 21, dated January 10, 2011; as applicable. Model 40, 45 Q5530011 Before the accumulation of 9,600 total flight hours Bombardier Learjet 45 Maintenance Manual MM-104, Revision 53, dated January 10, 2011; or Bombardier Learjet 40 Maintenance Manual MM-105, Revision 21, dated January 10, 2011; as applicable. Model 40, 45 P3220007 Within 48 months after the most recent inspection done in accordance with IRN # P3220007 Bombardier Learjet 45 Maintenance Manual MM-104, Revision 53, dated January 10, 2011; or Bombardier Learjet 40 Maintenance Manual MM-105, Revision 21, dated January 10, 2011; as applicable. Model 40, 45 P3220146 Before the accumulation of 4,800 total landings Bombardier Learjet 45 Maintenance Manual MM-104, Revision 53, dated January 10, 2011; or Bombardier Learjet 40 Maintenance Manual MM-105, Revision 21, dated January 10, 2011; as applicable. Model 40, 45 N3220012, N3220023, N3220035, N3220036, and N3220037 Before the accumulation of 10,000 total landings on the component Bombardier Learjet 45 Maintenance Manual MM-104, Revision 53, dated January 10, 2011; or Bombardier Learjet 40 Maintenance Manual MM-105, Revision 21, dated January 10, 2011; as applicable. Model 40, 45 N3220103, N3220104, and N3220106 Before the accumulation of 17,000 total landings on the component Bombardier Learjet 45 Maintenance Manual MM-104, Revision 53, dated January 10, 2011; or Bombardier Learjet 40 Maintenance Manual MM-105, Revision 21, dated January 10, 2011; as applicable. Model 45 N5710147, N5710171, and N5710173 Before the accumulation of 6,500 total flight hours Bombardier Learjet 45 Maintenance Manual MM-104, Revision 53, dated January 10, 2011. Model 45 N5710175 Before the accumulation of 6,900 total flight hours Bombardier Learjet 45 Maintenance Manual MM-104, Revision 53, dated January 10, 2011. Model 45 N5710177 Before the accumulation of 7,000 total flight hours Bombardier Learjet 45 Maintenance Manual MM-104, Revision 53, dated January 10, 2011.

This AD was prompted by changes to the Airworthiness Limitations Section (ALS) of the maintenance manual (MM), which adds life-limits, revises life-limits, or adds inspections not previously identified. We are issuing this AD to limit exposure of flight critical components to corrosion, cracking, or failure due to life-limits, which if not corrected, could result in loss of roll control, fatigue cracking, or loss of structural components.

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