Dont Fear The Red X

Editorial Staff

Friday, August 01, 2014 at 12:00 AM ET

Verified

Key Takeaways:

Pilots must thoroughly understand their EFIS system's architecture, including potential single points of failure and how they can affect multiple instruments and autopilot functions.
Many glass cockpits, particularly retrofits, lack full redundancy, meaning a single sensor or component failure (e.g., a pitot/static blockage) can lead to widespread loss of critical flight data across displays.
It is crucial for pilots to read and understand the flight manual supplement, as it provides vital information on system limitations, emergency procedures for failures, and the proper use of backup systems.
Ignoring clear system failure warnings (like a "red X" on the display) and attempting to operate with compromised EFIS or autopilot systems can lead to cascading failures and catastrophic outcomes.

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As a technician, I think of EFIS in terms of failures. While most pilots don’t need to dig deep into system schematics, a little tech savvy can help you recognize and understand the implications of a failed EFIS.

It doesn’t matter if it’s a component failure, wiring problem or software glitch—a proper understanding of the system you fly means learning the architecture as a whole. This means dissecting the interface down to the component level and basic interconnect flow.