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Left Seat: When Backup Systems Lie

The air data information on this
Garmin PFD is only as good as the
pitot-static system.
Garmin
Gemini Sparkle

Key Takeaways:

  • Simulator training demonstrated how initial, easily-managed system failures can foster complacency, setting a trap for subsequent, more complex failures that mislead the pilot.
  • The article highlights the danger of apparent redundancy; two systems can present identical, erroneous data if a common underlying fault causes both to fail or appear to agree incorrectly.
  • Pilots must maintain suspicion and critically cross-check all available information (e.g., pitch, ground speed, angle of attack) beyond primary instruments to correctly diagnose system failures and avoid being misled.
  • Unlike truly redundant (triplicate) systems that can automatically vote out failures, pilots in aircraft with less redundancy must rely on vigilance and critical thinking to interpret contradictory data.
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By now I should know to expect anything and everything to fail while training in a flight simulator, but experienced instructors like FlightSafety’s Fred Pfeiffer can concoct scenarios that I never thought of before. The purpose is to make you think about the airplane and its systems, but also to reinforce that complacency is the No. 1 enemy of safety.

It was during the second of three sim sessions in CJ2+ recurrent training that Fred failed the air data computer on my side of the cockpit. At least I think it was the computer. It could have been something wrong with the pitot-static system, but in any case, airspeed, altitude and vertical speed information blanked on the flat-glass primary flight display (PFD). That was only a momentary problem because the push of a button sent air data information from the copilot’s side onto my PFD with a display color change to remind me that I was looking at cross-cockpit data.

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