Hydraulic Power — Direct Current Motor Pump Failures
- Published
- Effective
- Deadline
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of affected Bombardier BD-100-1A10 aircraft must install the modified DC motor pump motor (part number 945202-3) following Bombardier Service Bulletin 100-29-18 revision 03 or later within six months from the directive's effective date of October 7, 2020. After modification, the older motor model MB74F-9/-7 must not be installed. Maintenance teams should verify compliance and update records accordingly.
Summary
The Canadian Airworthiness Directive CF-2020-31 addresses failures of direct current (DC) motor pumps in Bombardier BD-100-1A10 aircraft with serial numbers 20003 to 20406. This directive mandates compliance with Bombardier Service Bulletin 100-29-18, which introduces a redesigned DC motor pump more resistant to high temperatures encountered at altitude. The directive aims to prevent electrical system issues caused by pump overheating during flight.
What changed
CF-2020-31 introduces a mandatory requirement to install a modified DC motor pump motor, part number 945202-3, as specified in Bombardier Service Bulletin 100-29-18 revision 03 or later. It prohibits the installation of the previous motor model MB74F-9/-7 after the modification is incorporated. This directive formalizes the voluntary fleet modification campaign initiated by Bombardier.
Why it matters
This directive is critical for operators and maintenance organizations to ensure the reliability of the hydraulic power generation system and prevent electrical bus overvoltage conditions caused by pump failures. Compliance reduces the risk of loss of normal electrical power during flight, enhancing safety and operational continuity. It also ensures adherence to Canadian aviation regulatory requirements.
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