Flight Controls — Roll Control Input-Modules (RCIMs) Incorrect Installation
- Published
- Effective
- Replaces
- 2020-35
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 use the updated AMM installation, adjustment, and functional test procedures for RCIM maintenance within 10 days of the previous AD's effective date. For aircraft with RCIM part number GT415−6006−5, both left and right RCIMs must be replaced and tested according to Bombardier Service Bulletins before further flight if maintenance involves removal or disconnection of these modules.
Summary
The Canadian Airworthiness Directive CF-2025-50 addresses incorrect installation of Roll Control Input-Modules (RCIMs) on Bombardier Inc. model BD-700-1A10 and BD-700-1A11 aircraft, serial numbers 9002 through 9998 and 60001 through 60184. This directive mandates compliance with updated Aircraft Maintenance Manual procedures and requires replacement and testing of certain RCIM part numbers to ensure proper roll control function and prevent loss of aircraft control.
What changed
CF-2025-50 supersedes AD CF-2020-35 and maintains its requirements while introducing a mandate to replace and test RCIMs with part number GT415−6006−5 during specified maintenance. It also incorporates Bombardier Service Bulletins for RCIM replacement and testing, and enforces the use of revised AMM procedures to prevent incorrect installation and misrigging of the roll control system.
Why it matters
This directive is critical for aviation professionals because incorrect installation of RCIMs can cause multi-function spoilers to deploy opposite to roll commands, risking loss of aircraft control. Operators and maintenance organizations must follow updated procedures and replace outdated RCIMs to ensure flight safety and regulatory compliance. Adhering to this AD reduces the risk of in-flight control issues and potential accidents.
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