Embraer Legacy 450/500 and Praetor 500/600 jets face mandatory urgent inspections due to a critical stabilizer control issue linked to angle-of-attack (AOA) limiter protection failures. The flaw, highlighted in recent NTSB reports, has prompted FAA and ANAC airworthiness directives mandating immediate software updates and checks.
A Flexjet-operated Praetor 500 (EMB-545) suffered substantial damage from a hard landing on September 21, 2023, when AOA limiter control laws prevented disengagement amid gusting winds and pilot sidestick inputs. NTSB determined the system’s rigid criteria—requiring specific AOA reduction, airspeed, and load factor thresholds—locked pitch control, leaving crews unable to flare properly despite ample stall margin.
This affects all EMB-545 and EMB-550 models, including Legacy and Praetor variants, grounding operations until compliance. ANAC’s AD 2024-02-02R1, issued 22 months post-incident, revises limiter logic for faster disengagement on pitch-down commands and heightened sidestick response.
FAA’s AD 2024-05-13, effective March 26, 2024, demands flight control computer software upgrades worldwide. A final FAA rule on AOA limiter enhancements is slated for September 2026, signaling ongoing scrutiny of fly-by-wire safeguards.
Operators must monitor thrust levers closely and initiate go-arounds if AOA protection engages post-stabilized approach. The directives underscore vulnerabilities in automated protections during gusty conditions, impacting fleet reliability and safety for high-end business jet users.