AD 98-20-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | ATR - GIE Avions de Transport Régional | ATR42-200 | Airworthiness Directives; Aerospatiale Model ATR42 Series Airplanes |
| aircraft | ATR - GIE Avions de Transport Régional | ATR42-300 | Airworthiness Directives; Aerospatiale Model ATR42 Series Airplanes |
| aircraft | ATR - GIE Avions de Transport Régional | ATR42-320 | Airworthiness Directives; Aerospatiale Model ATR42 Series Airplanes |
Unsafe Condition
Loss of the standby horizon indicator in the event of failure of emergency direct current (DC) power, which could result in reduced controllability of the airplane during instrument flight rules conditions.
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Required Actions
Modify the electrical power supply for the standby horizon indicator in accordance with Avions de Transport Regional Service Bulletin ATR42-34-0090, Revision 1, dated April 22, 1997. An alternative method of compliance may be used if approved by the FAA.
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Compliance Time
Within 12 months after the effective date of this AD
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Affected Aircraft
Aerospatiale Model ATR42-200, -300, and -320 series airplanes on which Aerospatiale Modification 4647 has not been accomplished.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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