AD 2012-06-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier | Various | Airworthiness Directives; Bombardier, Inc. Model BD-100-1A10 (Challenger 300) Airplanes |
Unsafe Condition
The horizontal stabilizer trim actuator (HSTA) no-back and the number 1 motor brake assembly (MBA) can both fail dormant. This, along with additional component failure, could result in an uncontrollable horizontal stabilizer surface runaway without the ability to retrim, and consequent loss of the airplane.
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Required Actions
Revise the maintenance program to include Task 27-40-00-107, 'Functional Test of the Horizontal Stabilizer Trim Actuator (HSTA) No Back,' in accordance with Bombardier Temporary Revision 5-2-59, dated November 25, 2010. The initial compliance time varies based on the total flight hours on the HSTA as of the effective date of the AD.
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Compliance Time
Within 30 days after the effective date of the AD.
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Affected Aircraft
All Bombardier, Inc. Model BD-100-1A10 (Challenger 300) airplanes, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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