Landing Gear — Nose Landing Gear — Steering Shutoff Valve Slow to Deactivate
- 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-700-1A10 and BD-700-1A11 aircraft must replace the steering selector valve part number 23600-101 with part number 23600-103 within 66 months or 3200 flight hours from 25 January 2023, whichever occurs first. The replacement must follow the instructions in the applicable Bombardier Service Bulletins listed in the directive. Credit is given if the replacement was completed before the effective date according to the specified service bulletins.
Summary
Canadian Airworthiness Directive CF-2023-02 addresses an issue with the nose landing gear steering shutoff valve on Bombardier Inc. model BD-700-1A10 and BD-700-1A11 aeroplanes, serial numbers 9002 through 9998 and 60001 through 60068. The directive mandates replacing the existing steering selector valve part number 23600-101 with a redesigned valve part number 23600-103 to improve response time. This AD aims to prevent runway excursions caused by slow deactivation of the steering valve under low temperature conditions.
What changed
CF-2023-02 introduces a new requirement to replace the nose landing gear steering shutoff valve with an improved design that deactivates faster. This is a new regulation targeting specific Bombardier BD-700 models to mitigate the risk of delayed transition to free castor mode during steering. The AD also provides credit for prior compliance if the replacement was done according to specified Bombardier Service Bulletins.
Why it matters
This directive is critical for operators and maintenance teams to ensure safe ground handling and prevent runway excursions caused by un-commanded steering inputs. Compliance reduces the risk of accidents related to slow valve deactivation, especially in low temperature environments. It also ensures adherence to Canadian Aviation Regulations and maintains aircraft airworthiness.
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