Landing Gear — Nose Wheel Steering System — Un-Commanded Nose Wheel Deviation
- Published
- Effective
- Deadline
- Replaces
- 2013-38
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of affected DHC-8-401 and -402 aircraft must complete the required modifications to the nose wheel steering system within 4000 flight hours or 18 months from the effective date of August 28, 2020, whichever occurs first. Compliance can be achieved by following the instructions in the specified De Havilland Service Bulletin or approved alternatives.
Summary
Canadian Airworthiness Directive CF-2020-28 addresses the nose wheel steering system on De Havilland Aircraft of Canada Limited model DHC-8-401 and -402 aeroplanes, serial numbers 4001 and 4003 through 4608. This directive mandates modifications to prevent un-commanded nose wheel deviations that could lead to loss of directional control. It supersedes a previous directive issued in 2013.
What changed
CF-2020-28 replaces AD CF-2013-38 and introduces a requirement to incorporate a redesigned nose wheel steering system to eliminate the risk of unintended steering commands caused by loss of feedback from rotary variable differential transformers. The directive specifies compliance with De Havilland Service Bulletin 84-32-162, Revision B or later approved revisions.
Why it matters
This directive is critical for operators and maintenance organizations to prevent nose wheel steering runaway events that could compromise aircraft safety during ground operations. Ensuring compliance reduces the risk of accidents related to loss of directional control and supports continued airworthiness of affected DHC-8-400 series aircraft.
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