Electrical Power — Misleading Indications

Published: May 30, 2023
Effective: Jun 9, 2023
Deadline: Jun 9, 2024
Replaces: 2022-28

Bombardier BD-100 1A10

AI-generated summary of the official EASA document. Verify against the PDF before acting.

What to do

Operators must verify the accumulated hours air time on affected LH DCPC units within 60 days of the effective date and replace units with 3500 or more hours within 12 months. Units with part number 975GC02Y07 previously cleaned must be modified within 12 months. Installation of older LH DCPC units is prohibited within 60 days of the effective date.

Summary

Canadian Airworthiness Directive CF-2023-35 addresses misleading electrical power indications on Bombardier Inc. model BD-100-1A10 aeroplanes. The directive targets erratic electrical system status indications caused by contamination in the left-hand direct current power centre (DCPC) data bus, which can lead to partial or complete electrical power loss and affect flight displays and controllability.

What changed

CF-2023-35 supersedes AD CF-2022-28 and retains the requirement to verify accumulated hours on affected LH DCPC units. It mandates removal and replacement of certain LH DCPC units with updated parts and introduces a modification for part number 975GC02Y07 by adding a protective tape layer. The directive also prohibits installation of older LH DCPC units and anticipates a future maintenance task for lower time units.

Why it matters

This directive is critical for operators and maintenance teams to prevent misleading electrical indications that could cause crews to inadvertently shut down active electrical power sources. Compliance ensures continued safe operation of the BD-100-1A10 aircraft by reducing the risk of electrical power loss and associated loss of flight displays, thereby maintaining aircraft controllability and safety.

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