AD 2017-26-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | ATR-GIE | Avions de Transport Régional | Airworthiness Directives; ATR-GIE Avions de Transport Régional Airplanes |
Unsafe Condition
During flight evaluations performed on Flight Synthetic Test Devices of ATR airplanes equipped with New Avionics Suite (also known as `Glass Cockpit'), with one Air Data Computer (ADC) or one Attitude and Heading Reference System (AHRS) inoperative, it was found that, after engine failure during autopilot (AP) or Yaw Damper (YD) re-engagement, the YD unit commanded the rudder to return to neutral position leading to inadequate balancing of the asymmetric power.
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Required Actions
Revising the airplane flight manual (AFM) to provide procedures to the flight crew for operational restrictions affecting in-flight use of the autopilot (AP) or yaw damper (YD) during dual-engine operation. An optional software modification is available, which would terminate the AFM requirement.
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Compliance Time
Before further flight
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Affected Aircraft
ATR-GIE Avions de Transport Régional Model ATR42-500 and ATR72-212A airplanes
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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