AD Amdt-39-10615
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier | Various | Airworthiness Directives; Bombardier Model CL-600-2B19 (Regional Jet Series 100) Airplanes |
Unsafe Condition
Deficiencies of the horizontal stabilizer trim control unit (HSTCU) could result in a nose-up trim runaway when a single component in the mach trim circuit fails.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace the horizontal stabilizer trim control unit (HSTCU) with a new HSTCU, reactivate the mach trim engage/disengage switch/light if deactivated, and revise the Airplane Flight Manual (AFM) to prohibit mach trim use and add speed restrictions when the autopilot is disengaged or inoperative.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Bombardier Model CL-600-2B19 (Regional Jet Series 100) airplanes affected by the existing AD and subject to the amended requirements.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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