AD 2025-12-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus | Canada Limited Partnership Model BD-500-1A11 | Airworthiness Directives; Airbus Canada Limited Partnership (Type Certificate Previously Held by C Series Aircraft Limited Partnership (CSALP); Bombardier, Inc.) Airplanes |
| aircraft | Bombardier | Various | Airworthiness Directives; Airbus Canada Limited Partnership (Type Certificate Previously Held by C Series Aircraft Limited Partnership (CSALP); Bombardier, Inc.) Airplanes |
Unsafe Condition
Potential use of an uncalibrated torque wrench when tightening the union fittings at the pressure and return interfaces of all three rudder hydraulic power control units (PCUs), which could cause the union fittings to come loose and leak, resulting in the potential loss of one or more hydraulic systems.
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Required Actions
Properly torque the rudder PCU hydraulic fittings and apply the torque seal on the rudder PCU hydraulic fittings. Perform a visual inspection for hydraulic leaks at all coil tube fittings of the upper, middle, and lower rudder PCUs. Take applicable corrective actions, including tightening the nut to the specified torque, testing for leakage limits to ensure any leak is within the applicable leakage tolerance, replacing any defective components, and replacing the rudder PCU.
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Compliance Time
Before further flight, except as specified in steps 13 and 22 of AMP BD500-A-J27-21-01-01AAA-364B-A.
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Affected Aircraft
Airbus Canada Limited Partnership Model BD-500-1A11 airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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