Airworthiness directives › 2023-20-09
AD 2023-20-09 Airworthiness Directives; MHI RJ Aviation ULC (Type Certificate Previously Held by Bombardier Inc.) Airplanes
Applicability*9
This AD applies to all MHI RJ Aviation ULC (type certificate previously held by Bombardier Inc.) Model CL-600-2E25 (Regional Jet Series 1000) airplanes, certificated in any category.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Within 60 days after the effective date of this AD, revise the existing maintenance or inspection program, as applicable, to establish a life limit of 9,300 flight cycles for the MLG retract actuator piston rod (part of MLG retract actuator 55600), part number 55615-1. The initial compliance time for removing the part from service is at the applicable time specified in paragraphs (g)(1) through (3) of this AD. Note 1 to paragraph (g): The life limit in paragraph (g) of this AD can be found in Airworthiness Limitation (ALI) Task Number 32-32-05-709 for Configuration B, “Piston Rod, MLG Retract Actuator (part of MLG Retract Actuator 55600)” of MHI RJ CRJ700/900/1000 Temporary Revision ALI-0763, dated April 14, 2022 (TR ALI-0763), which specifies an effective date of April 14, 2022. (1) For a MLG retract actuator piston rod that has accumulated fewer than 4,300 total flight cycles as of April 14, 2022 (phase-in Effective Date of TR ALI-0763): Before accumulating 9,300 total flight cycles. (2) For a MLG retract actuator piston rod that has accumulated 4,300 total flight cycles or more and 18,000 total flight cycles or fewer as of April 14, 2022 (phase-in Effective Date of TR ALI-0763): Within 5,000 flight cycles from April 14, 2022, or before exceeding 20,000 total flight cycles, whichever occurs first. (3) For a MLG retract actuator piston rod that has accumulated more than 18,000 total flight cycles as of April 14, 2022 (phase-in Effective Date of TR ALI-0763): Within 2,000 flight cycles from April 14, 2022.
Unsafe condition
This AD was prompted by a determination that a new airworthiness limitation is necessary. The FAA is issuing this AD to establish a life limit for main landing gear (MLG) retract actuator piston rod part number 55615-1. Exceeding this life limit could result in failure of the MLG retract actuator piston in flight, causing an undamped MLG free fall extension. The unsafe condition, if not addressed, could result in MLG collapse on landing.
Affected ADs
None.
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