AD 2019-15-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier | Various | Airworthiness Directives; Bombardier, Inc. Airplanes |
Unsafe Condition
A mis-installed no-back pawl on a horizontal stabilizer trim actuator (HSTA) could lead to a loss of the aeroplane if not corrected, in combination with loss of or degraded HSTA Motor Brake Assemblies (MBA) braking capability.
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Required Actions
An inspection to verify the HSTECU part number, a software upgrade for certain HSTECUs, and installation of HSTECUs with upgraded software.
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Compliance Time
Before further flight
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Affected Aircraft
Bombardier, Inc., Model BD-100-1A10 airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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