AD 2006-22-06
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
Uncommanded horizontal stabilizer trim motion could result in excessive uncommanded movement of the horizontal stabilizer trim actuator (HSTA) and loss of ability to use trim switches to override uncommanded movement or yoke disconnect switches to disconnect the HSTA, which could result in reduction of or loss of pitch control and consequent reduced controllability of the airplane.
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Required Actions
Revise the Emergency and Abnormal Procedures sections of the AFM to advise the flightcrew of revised/additional procedures. Revise the Normal section of the AFM to require a review of the location of certain circuit breakers and a functional check of the stabilizer trim system. Install circuit breaker identification collars. Install a new, improved horizontal stabilizer trim control unit (HSTCU).
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Compliance Time
Before further flight
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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, excluding serial numbers 5666 and subsequent for CL-604 and 8067 and subsequent for Regional Jet Series 100 & 440, which have the improved HSTCU installed during production.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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