AD 2017-25-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | ATR-GIE | Avions de Transport Régional | Airworthiness Directives; ATR-GIE Avions de Transport Régional Airplanes |
Unsafe Condition
Discrepancies with the yaw damper (YD) and autopilot (AP) when in single source operation (one Air Data Computer (ADC) inoperative, one Attitude and Heading Reference System (AHRS) inoperative, or failure of both Direct Current (DC) Generators) upon a sudden engine power asymmetry at low Indicated Air Speed (IAS), leading to inappropriate flight equilibrium and requiring significant flight control efforts on the roll axis.
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Required Actions
Revise the Airplane Flight Manual (AFM) to include operational restrictions for the autopilot (AP) and yaw damper (YD) when in single source operation and operating at an Indicated Air Speed (IAS) below 160kt. The revision must be completed within 15 days after the effective date of this AD.
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Compliance Time
Within 15 days after the effective date of this AD
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Affected Aircraft
ATR-GIE Avions de Transport Régional Model ATR42-500 and ATR72-212A airplanes, certificated in any category, all manufacturer serial numbers, modified in production by incorporation of Avions de Transport Régional modification 6977 (New Avionics Suite Standard 2) or modified in service by incorporation of Avions de Transport Régional Service Bulletin ATR42-31-0091, Revision 02, or ATR72-31-1092, Revision 03.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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