AD 2006-18-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier | Various | Airworthiness Directives; Bombardier Model CL-600-2B16 (CL-604) Airplanes and Model CL-600-2B19 (Regional Jet Series 100 & 440) Airplanes |
Unsafe Condition
Contamination of the circuit board of the horizontal stabilizer trim control unit (HSTCU) could lead to uncommanded movement of the horizontal stabilizer trim actuator (HSTA), loss of ability to override uncommanded movement using trim switches, or loss of ability to disconnect the HSTA using yoke disconnect switches.
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Required Actions
Revise the Emergency Procedures section of the airplane flight manual (AFM) to advise the flightcrew of additional procedures to follow in the event of stabilizer trim runaway. For certain airplanes, also revise the Abnormal Procedures section of the AFM to advise the flightcrew of procedures to follow in the event of MACH TRIM, STAB TRIM, and horizontal stabilizer trim malfunctions.
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Compliance Time
Within 50 flight hours after the effective date of this AD.
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Affected Aircraft
Bombardier Model CL-600-2B16 (CL-604) airplanes and Model CL-600-2B19 (Regional Jet Series 100 & 440) airplanes, including marketing designations RJ100, RJ200, CRJ100, CRJ200, and CL-65.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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