Air Conditioning — Avionics Cooling — Integrated Flight Cabinet Failure Due to High Temperatures
- Published
- Effective
- Deadline
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 modify the IFC cooling system in accordance with the specified service bulletin within 8000 flight hours or 48 months from the effective date of March 17, 2022, whichever occurs first. The modification can be done using either Revision A or B of the service bulletin, with later approved revisions also acceptable. Contact Transport Canada for further guidance if needed.
Summary
Airworthiness Directive CF-2022-09 is issued by Transport Canada and applies to De Havilland Aircraft of Canada Limited model DHC-8-401 and -402 aeroplanes, serial numbers 4095 through 4633. The directive addresses failures in the Integrated Flight Cabinet (IFC) caused by higher-than-expected operating temperatures affecting avionics cooling. This condition could lead to autopilot pitch trim servo runaway and stall warning system failures, impacting aircraft controllability.
What changed
This new Airworthiness Directive mandates a design modification to the IFC cooling system through compliance with De Havilland Aircraft of Canada Service Bulletin 84-21-24, Revision B or Revision A. The modification aims to reduce the operating temperature within the IFC to improve reliability and safety. It introduces a corrective action to mitigate the risk of avionics failure due to overheating.
Why it matters
This directive is critical for aviation professionals because it addresses a safety risk that could lead to loss of aircraft control due to avionics failures. Operators and maintenance organizations must ensure compliance to prevent potential autopilot and stall warning system malfunctions. Compliance helps maintain airworthiness and operational safety of affected DHC-8-400 series aircraft.
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New ADs and bulletins for De Havilland Canada DHC-8, Havilland DHC-8-401 and Havilland DHC-8-402, summarized like this page, every Monday.