Airworthiness directives › 2021-24-16
AD 2021-24-16 Airworthiness Directives; Daher Aerospace (Type Certificate Previously Held by SOCATA) Airplanes
Makes named: daher, socata. Models named: TB 20, TB 21. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to Daher Aerospace (type certificate previously held by SOCATA) Model TB 20 and TB 21 airplanes, all serial numbers, certificated in any category.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Before the MLG exceeds 16,000 landings since first installation on an airplane or within 200 landings after the effective date of this AD, whichever occurs later, and thereafter at intervals not to exceed 3,200 landings, accomplish the magnetic particle inspection on each MLG for cracks in the left-hand and right-hand MLG leg and take all applicable corrective actions before further flight in accordance with the Description of Accomplishment Instructions in Daher Aerospace Service Bulletin SB 10-154-32, dated September 2019, except you are not required to contact the manufacturer. Instead, repair using a method approved by the Manager, International Validation Branch, FAA; the European Union Aviation Safety Agency (EASA); or Daher Aerospace's EASA Design Organization Approval (DOA). If approved by the DOA, the approval must include the DOA-authorized signature. For a repair to be approved as required by this paragraph, the approval letter must specifically refer to this AD. (2) For the purposes of this AD, any maneuver resulting in weight on the MLG for any duration of time after initial takeoff counts as a landing. If the number of landings for the MLG is unknown, multiply the number of airframe hours by a factor of 3.6 and round up to the nearest whole landing.
Unsafe condition
This AD was prompted by mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as cracks on the main landing gear (MLG) legs. The FAA is issuing this AD to prevent structural failure of an MLG leg and consequent collapse of the MLG. The unsafe condition, if not addressed, could result in damage to the airplane and injury to occupants.
Affected ADs
None.
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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