Aviation English
Emergencies

What is Abnormal Control Law?

Abnormal Control Law A rare fallback flight control law in fly-by-wire aircraft used under severe system failures where no flight envelope protections are available and handling characteristics are degraded.

Source: ICAO Doc 9432, FAA PCG

How is “Abnormal Control Law” Used in Practice?

ATC, be advised we are in abnormal control law due to extensive system loss, manual handling required.

Certification Exam Relevance

ICAO Level 4ICAO Level 5ICAO Level 6EASA FCL.055

Who Needs to Know This Term?

  • Pilots
  • Air Traffic Controllers
  • Cabin Crew

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Frequently Asked Questions

What is Abnormal Control Law?

A rare fallback flight control law in fly-by-wire aircraft used under severe system failures where no flight envelope protections are available and handling characteristics are degraded.

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