AD 2011-23-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier | Various | Airworthiness Directives; Bombardier, Inc. Model CL-600-2B19 (Regional Jet Series 100 & 440) Airplanes |
| aircraft | Aviat | Various | Airworthiness Directives; Bombardier, Inc. Model CL-600-2B19 (Regional Jet Series 100 & 440) Airplanes |
Unsafe Condition
Seven cases of on-ground hydraulic accumulator screw cap/end cap failure have been experienced on CL-600-2B19 aeroplanes, resulting in the loss of the associated hydraulic system and high-energy impact damage to adjacent systems and structure. Although all failures to date have occurred on the ground, an in-flight failure could potentially affect controllability.
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Required Actions
Remove the hydraulic system No. 3 accumulator and replace the hydraulic system No. 1, inboard brake and outboard brake accumulators. For airplanes with Bombardier Service Bulletin 601R-29-035 and a reducer having part number MS21916D8-6 installed, replace the reducer with a new one.
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Compliance Time
Within 12 months of the effective date (December 22, 2011)
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Affected Aircraft
Bombardier, Inc. Model CL-600-2B19 (Regional Jet Series 100 & 440) airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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