Airworthiness directives › 2011-25-03
AD 2011-25-03 Airworthiness Directives; Learjet Inc. Airplanes
Models named: 45. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to Learjet Inc. Model 45 airplanes, certificated in any category; all serial numbers. Note 1: 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 actions 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.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Within 30 days after the effective date of this AD, revise the maintenance program by incorporating inspection reference number (IRN) T3220105 (Main Landing Gear Actuator End Cap (part number (P/N) 200-0303)), as specified in Learjet 40 Temporary Revision 4-23, dated January 24, 2011, to Learjet 40 Maintenance Manual; or Learjet 45 Temporary Revision 4-34, dated January 24, 2011, to Learjet 45 Maintenance Manual; as applicable. The initial compliance time for the replacement specified in IRN T3220105 is prior to the accumulation of 2,387 total flight cycles on the end cap (P/N 200-0303), or within 25 flight cycles after the effective date of this AD, whichever occurs later.
Unsafe condition
This AD was prompted by a report of the potential for fatigue cracking of the end cap of the main landing gear (MLG) prior to the published life limitation. We are issuing this AD to prevent fatigue cracking of the end cap of the MLG, which could result in the failure of the MLG actuator upon landing, and failure of the MLG to extend or retract during flight.
Affected ADs
None.
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