AD 99-19-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | ATR - GIE Avions de Transport Régional | ATR42-200 | Airworthiness Directives; Aerospatiale Model ATR-42 and ATR-72 Series Airplanes |
| aircraft | ATR - GIE Avions de Transport Régional | ATR42-300 | Airworthiness Directives; Aerospatiale Model ATR-42 and ATR-72 Series Airplanes |
| aircraft | ATR - GIE Avions de Transport Régional | ATR42-320 | Airworthiness Directives; Aerospatiale Model ATR-42 and ATR-72 Series Airplanes |
| aircraft | ATR - GIE Avions de Transport Régional | ATR42-500 | Airworthiness Directives; Aerospatiale Model ATR-42 and ATR-72 Series Airplanes |
| aircraft | ATR - GIE Avions de Transport Régional | ATR72-101 | Airworthiness Directives; Aerospatiale Model ATR-42 and ATR-72 Series Airplanes |
| aircraft | ATR - GIE Avions de Transport Régional | ATR72-102 | Airworthiness Directives; Aerospatiale Model ATR-42 and ATR-72 Series Airplanes |
| aircraft | ATR - GIE Avions de Transport Régional | ATR72-201 | Airworthiness Directives; Aerospatiale Model ATR-42 and ATR-72 Series Airplanes |
| aircraft | ATR - GIE Avions de Transport Régional | ATR72-202 | Airworthiness Directives; Aerospatiale Model ATR-42 and ATR-72 Series Airplanes |
| aircraft | ATR - GIE Avions de Transport Régional | ATR72-211 | Airworthiness Directives; Aerospatiale Model ATR-42 and ATR-72 Series Airplanes |
| aircraft | ATR - GIE Avions de Transport Régional | ATR72-212 | Airworthiness Directives; Aerospatiale Model ATR-42 and ATR-72 Series Airplanes |
Unsafe Condition
Failure to activate the airframe pneumatic deicing boots at the first signs of ice accumulation in icing conditions, leading to reduced controllability due to adverse aerodynamic effects of ice adhering to the airplane prior to the first deicing cycle.
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Required Actions
Revise the Limitations Section of the FAA-approved Airplane Flight Manual (AFM) within 10 days after the effective date to include requirements for activation of the ice protection systems. The AFM must specify activation at the first sign of ice formation or ice detector annunciation, and either continue automatic cycling or manually cycle the system as needed. Deactivation is only allowed after completing an entire deicing cycle post-icing conditions.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 10 days after the effective date of this AD
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Affected Aircraft
Aerospatiale Model ATR-42 and ATR-72 series airplanes equipped with pneumatic deicing boots, certificated in any category.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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